Date   

2022 New Mexico TechFest -- Call for Presentations

Brian Mileshosky
 

Greetings — 

Rocky Mountain Ham Radio - New Mexico (RMHAM) is pleased to announce its eighth annual New Mexico TechFest, an ARRL-sanctioned operating specialty event, on Saturday, March 5, 2022.  TechFest features a day of quality presentations and demonstrations provided by some of New Mexico and Colorado’s leading technical hams on a variety of emerging and relevant topics within amateur radio.  Its purpose is to facilitate the sharing of technical knowledge and collaboration within the amateur radio community, and to encourage the discussion of new ideas with one another.

Due to a short notice and prohibitive cost increase at Techfest’s traditional venue and ongoing COVID related mandates related to large indoor events, this year’s event will be conducted virtually. 

TechFest is open to all interested hams.  Admission is $10 (proceeds will offset event related expenses detailed on the event website).  Online registration will open on February 20, when the event’s lineup of presentations and demonstrations is announced.  Presentation-related prizes will be drawn throughout the event.

CALL FOR TECHFEST PRESENTATIONS AND DEMONSTRATIONS: The New Mexico TechFest is seeking presentations and demos on emerging and relevant amateur radio technical topics, techniques, and applications.   If you’ve been working on a special project, are researching a technical topic, or have discovered or adopted a technology or technique that you’re applying within amateur radio, TechFest is a great venue to share your knowledge with the amateur radio community in a casual and friendly environment.  Presentations will generally be 50 minutes in total length.  Hams interested in providing a presentation or demonstration are asked to submit a summary/abstract of their proposed topic for consideration by February 13, 2022. We will be happy to assist you with conducting your presentation virtually.  Visit the New Mexico TechFest website for submission details and key dates.

Additional details about the New Mexico TechFest, for both attendees and potential presenters, can be found at http://www.rmham.org/wordpress/new-mexico-techfest  A printable event flyer for posting on ham listserves, your club’s website, or your club’s newsletter is attached.

We hope to see you at TechFest 2022.

73,
Brian N5ZGT (President, Rocky Mountain Ham Radio — New Mexico)




Re: contest logging dilemma

John Klem
 

Thanks for making the rules clear, and I appreciate the guidance on contest logging and the role judgement plays in error rate.  I hope to develop and apply better judgement over time.  It would also be interesting to understand the relative contributions of various factors (operator inexperience, slow QSO rate vs. changing band conditions, QRM, etc.) on digital error rates.

Regarding non-contest QSO verification, I'd argue applying the "know the Q is made" rule is going to leave valid QSOs unconfirmed and make exchanges unnecessarily long, and is therefore wasteful.  I guess we'll debate that one another time.

73,

John, AA5PR

On 1/20/2022 7:59 AM, Keith Morehouse wrote:
Welcome to the 'wonderful' world of digital contesting where nobody knows for sure if QSOs are complete or not.  Between the problem you mentioned (which, to be fair, is not limited to digital Qs) and the guys sending RR73 on meteor scatter and over marginal paths, it's a miracle any valid Qs are logged at all.  The behavior of WSJTs auto sequencing doesn't help this situation.  It was certainly programmed by someone with little knowledge of weak signal operation.

This is one where you have to go with your gut feel on each Q.  Questions like, ...who did I work ?  ... what's my experience with him ?  need to be considered.  Then, how do you interpret the rules for logging a contest Q ?  Are you liberal or strict ?

What I'm saying, is it's on "you" the op, to decide how valid each Q is.  If you're wrong in a contest and the other guy sends in his log, it's not just an ethical thing (..am I taking improper credit that might be used toward some award ?).  You will be docked that Q and a penalty and your score will go down, with the possibility of being disqualified if you choose poorly enough times.

I lived my contesting life in the multi-op arena and differentiated my performance with my fellow ops by comparing error rates.  I was very proud to have an extremely low error and my approach to logging was influenced by that.  Others were not so inclined.  You'll have to make the call.  This happens much more with digital Qs and average error rates are going way up.

As far as trying to verify Qs after the fact, that is totally against the rules and unacceptable.  I consider that true even outside contests.  One is supposed to know the Q is made WHEN YOU MAKE IT.  That's one of the reasons LoTW is 'blind' and internet chat room Qs are cheapening awards.

Choose wisely !

-W9RM

Keith Morehouse
via MotoG

On Wed, Jan 19, 2022, 10:58 PM John Klem <klemjf@...> wrote:
Thanks to all who were able to provide me a few points in the contest
last weekend.  It was a tough one, but I enjoyed checking out some new
spots around the state, making contacts on 3 bands (need to get some
1296 experience before next time), having both digital and non-digital
QSOs, and it was a beautiful Sunday morning near the continental divide
down in the Apache National Forest in DM53.

Anyway, I'm looking for opinions regarding a dilemma I've been in a few
times in these contests.  I imagine it's not specific to VHF contests or
FT8, but those were my circumstances.  Here's the problem:

I'm trying to finish a QSO, sending "RRR" to the other guy.  When he
hears that, we have a complete QSO.  If he doesn't, we don't. He's
sending to me but I can't decode (substitute "understand" if you like)
him.  Is he sending R or 73?  I don't know.  Suddenly the band fades and
he is gone for good.  Do I log him or not?  He knows whether the QSO is
complete, but I don't.

If it weren't a contest, I'd log him for sure.  If he didn't hear my
RRR, he doesn't log me.  No big deal but no QSO.  If he did hear me,
we're both good.

But it's a contest.  If I log him and he didn't hear/log me, I not only
don't get the QSO points, I get a penalty.  But if I'm fearful of that
and don't log him, but he heard and logged me, he gets no QSO points and
a penalty and hates me.  What to do?

Can I ethically send him an email after the contest and ask if I'm in
his log?

Can I send him a QSL via LoTW and see if I get a match?

I suppose a competitive contester would base his choice on his
assessment of the likelihood that his QSO partner logged him,
considering band conditions and any other relevant factors.  Maybe this
situation has been debated to death or the question decided somewhere,
but I haven't heard it.  It's not exactly a life-or-death matter, but it
would be nice to have a guilt- and regret-free way of making the call. 
Or maybe I'm just missing something.  Any thoughts are welcome.

73,

John, AA5PR







Re: contest logging dilemma

Keith Morehouse
 

Welcome to the 'wonderful' world of digital contesting where nobody knows for sure if QSOs are complete or not.  Between the problem you mentioned (which, to be fair, is not limited to digital Qs) and the guys sending RR73 on meteor scatter and over marginal paths, it's a miracle any valid Qs are logged at all.  The behavior of WSJTs auto sequencing doesn't help this situation.  It was certainly programmed by someone with little knowledge of weak signal operation.

This is one where you have to go with your gut feel on each Q.  Questions like, ...who did I work ?  ... what's my experience with him ?  need to be considered.  Then, how do you interpret the rules for logging a contest Q ?  Are you liberal or strict ?

What I'm saying, is it's on "you" the op, to decide how valid each Q is.  If you're wrong in a contest and the other guy sends in his log, it's not just an ethical thing (..am I taking improper credit that might be used toward some award ?).  You will be docked that Q and a penalty and your score will go down, with the possibility of being disqualified if you choose poorly enough times.

I lived my contesting life in the multi-op arena and differentiated my performance with my fellow ops by comparing error rates.  I was very proud to have an extremely low error and my approach to logging was influenced by that.  Others were not so inclined.  You'll have to make the call.  This happens much more with digital Qs and average error rates are going way up.

As far as trying to verify Qs after the fact, that is totally against the rules and unacceptable.  I consider that true even outside contests.  One is supposed to know the Q is made WHEN YOU MAKE IT.  That's one of the reasons LoTW is 'blind' and internet chat room Qs are cheapening awards.

Choose wisely !

-W9RM

Keith Morehouse
via MotoG


On Wed, Jan 19, 2022, 10:58 PM John Klem <klemjf@...> wrote:
Thanks to all who were able to provide me a few points in the contest
last weekend.  It was a tough one, but I enjoyed checking out some new
spots around the state, making contacts on 3 bands (need to get some
1296 experience before next time), having both digital and non-digital
QSOs, and it was a beautiful Sunday morning near the continental divide
down in the Apache National Forest in DM53.

Anyway, I'm looking for opinions regarding a dilemma I've been in a few
times in these contests.  I imagine it's not specific to VHF contests or
FT8, but those were my circumstances.  Here's the problem:

I'm trying to finish a QSO, sending "RRR" to the other guy.  When he
hears that, we have a complete QSO.  If he doesn't, we don't. He's
sending to me but I can't decode (substitute "understand" if you like)
him.  Is he sending R or 73?  I don't know.  Suddenly the band fades and
he is gone for good.  Do I log him or not?  He knows whether the QSO is
complete, but I don't.

If it weren't a contest, I'd log him for sure.  If he didn't hear my
RRR, he doesn't log me.  No big deal but no QSO.  If he did hear me,
we're both good.

But it's a contest.  If I log him and he didn't hear/log me, I not only
don't get the QSO points, I get a penalty.  But if I'm fearful of that
and don't log him, but he heard and logged me, he gets no QSO points and
a penalty and hates me.  What to do?

Can I ethically send him an email after the contest and ask if I'm in
his log?

Can I send him a QSL via LoTW and see if I get a match?

I suppose a competitive contester would base his choice on his
assessment of the likelihood that his QSO partner logged him,
considering band conditions and any other relevant factors.  Maybe this
situation has been debated to death or the question decided somewhere,
but I haven't heard it.  It's not exactly a life-or-death matter, but it
would be nice to have a guilt- and regret-free way of making the call. 
Or maybe I'm just missing something.  Any thoughts are welcome.

73,

John, AA5PR







contest logging dilemma

John Klem
 

Thanks to all who were able to provide me a few points in the contest last weekend.  It was a tough one, but I enjoyed checking out some new spots around the state, making contacts on 3 bands (need to get some 1296 experience before next time), having both digital and non-digital QSOs, and it was a beautiful Sunday morning near the continental divide down in the Apache National Forest in DM53.

Anyway, I'm looking for opinions regarding a dilemma I've been in a few times in these contests.  I imagine it's not specific to VHF contests or FT8, but those were my circumstances.  Here's the problem:

I'm trying to finish a QSO, sending "RRR" to the other guy.  When he hears that, we have a complete QSO.  If he doesn't, we don't. He's sending to me but I can't decode (substitute "understand" if you like) him.  Is he sending R or 73?  I don't know.  Suddenly the band fades and he is gone for good.  Do I log him or not?  He knows whether the QSO is complete, but I don't.

If it weren't a contest, I'd log him for sure.  If he didn't hear my RRR, he doesn't log me.  No big deal but no QSO.  If he did hear me, we're both good.

But it's a contest.  If I log him and he didn't hear/log me, I not only don't get the QSO points, I get a penalty.  But if I'm fearful of that and don't log him, but he heard and logged me, he gets no QSO points and a penalty and hates me.  What to do?

Can I ethically send him an email after the contest and ask if I'm in his log?

Can I send him a QSL via LoTW and see if I get a match?

I suppose a competitive contester would base his choice on his assessment of the likelihood that his QSO partner logged him, considering band conditions and any other relevant factors.  Maybe this situation has been debated to death or the question decided somewhere, but I haven't heard it.  It's not exactly a life-or-death matter, but it would be nice to have a guilt- and regret-free way of making the call.  Or maybe I'm just missing something.  Any thoughts are welcome.

73,

John, AA5PR


Re: W9RM - Jan contest

Bill
 

GL Keith


On Jan 15, 2022, at 10:57 AM, Michael Daly <arrowengineering1@...> wrote:


jay,
I'm on from gallup. 2 meters okay.  I'll connect the 6 meter dipole and see what happens. Maybe one-half hour after the contest starts. contact me via chat, or by phone 505 870 3430 or n5sj@....
Mike,n5sj gallup

On Sat, Jan 15, 2022 at 10:41 AM Keith Morehouse <w9rm@...> wrote:
Good luck in the contest, those that are operating.

I can be available for a Q on 6/2/222 if anyone wants to try, but I'm not spending much time in the shack.  Nobody to work around here :)

Jay - W9RM
DM58xn CO

Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Olathe, CO


Re: W9RM - Jan contest

Michael Daly
 

jay,
I'm on from gallup. 2 meters okay.  I'll connect the 6 meter dipole and see what happens. Maybe one-half hour after the contest starts. contact me via chat, or by phone 505 870 3430 or n5sj@....
Mike,n5sj gallup

On Sat, Jan 15, 2022 at 10:41 AM Keith Morehouse <w9rm@...> wrote:
Good luck in the contest, those that are operating.

I can be available for a Q on 6/2/222 if anyone wants to try, but I'm not spending much time in the shack.  Nobody to work around here :)

Jay - W9RM
DM58xn CO

Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Olathe, CO


W9RM - Jan contest

Keith Morehouse
 

Good luck in the contest, those that are operating.

I can be available for a Q on 6/2/222 if anyone wants to try, but I'm not spending much time in the shack.  Nobody to work around here :)

Jay - W9RM
DM58xn CO

Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Olathe, CO


KK6MC/r corrected itinerary

James Duffey
 

Mike and Gary pointed out a couple of errors in my itinerary, so I have corrected it. As usual, things may happen for me to deviate from the itinerary, mostly if I am running late, particularly if the band is open. Please understand.

The rover is all setup and ready to go. 

If we work on FT8 or FT4 on 6M I will QSY to 2M and then 432 to try to work you. WE can try other bands if you have them, but I am not certain that my 222nMHz and 902 MHz have the frequency stability required for FT8 though. I will try to send a concise, but clear QSY message as TX5 as a reminder. Something like QSY 2M. I have had pretty good luck this way in the past. I will try to be on the analog calling frequency on the hour and half hour for 5 to 10 minutes. I want to work you, no matter what.

Looking forward to working you. Don’t forget the /r when you log me. - Duffey KK6MC/r  

 

Time in

Grid square

Time out

 

1900Z

DM45wa

1930Z

AZ77 North of Hopi Travel Plaza, E of Holbrook

2000Z

DM55cb

2130Z

Pintado Point, Petrified Forest

2200Z

DM54cb

2330Z

Blue Mesa, Petrified Forest

0130Z

DM44nh

0230Z

Scenic Overlook Mogollon Rim

Overnight in Phoenix

1500Z

DM42ax

1630Z

 

1645Z

DM32xx

1815Z

 

1830Z

DM33ax

2000Z

 

2015Z

DM43aa

2145Z

 

2345Z

DM34wg

0015Z

Agua Fria National Monument

 

DM45DE

 

If time, I will try to operate from Lowell Obs.




 MIMke and Gary 


Re: KK6MC/r

James Duffey
 

There is an error in my route, DM33xx should be DM33ax. I h ave corrected it in the table below. 

James Duffey KK6MC
Cedar Crest NM

On Jan 11, 2022, at 18:13, James Duffey <jamesduffey@...> wrote:

r

 

Time in

Grid square

Time out

 

1900Z

DM45wa

1930Z

AZ77 North of Hopi Travel Plaza, E of Holbrook

2000Z

DM55cb

2130Z

Pintado Point, Petrified Forest

2200Z

DM54cb

2330Z

Blue Mesa, Petrified Forest

0130Z

DN44nh

0230Z

Scenic Overlook Mogollon Rim

Overnight in Phoenix

1500Z

DM42ax

1630Z

 

1645Z

DM32xx

1815Z

 

1830Z

DM33ax

2000Z

 

2015Z

DM43aa

2145Z

 

2345Z

DM34wg

0015Z

Agua Fria National Monument

 

DM45DE

 

If time, I will try to operate from Lowell Obs.


Re: N7GP/R Jan Vhf Contest plans

Michael Daly
 

WE should all be sharing phone numbers so we can coordinate better,
Mike, n5esj
Gallup, NM DM 55pm
 505 870 3430

On Thu, Jan 13, 2022 at 11:16 AM Tom <wa8wzg@...> wrote:
To All...
For JAN contest this weekend ...
I will be starting in DM31 At 1700 UTC,, BEFORE contest starts I will be
on 50.265 MSK144 me 1st CM on and also FT8 around 2000 Hz DF... I will
be there until  2100 UTC  which is after contest starts.

Then I will move to DM32, DM33, DM42, DM43, and work the 4 grids until
around  0100  UTC  Saturday night,, then head to DM 34 and POSSIBLY DM
44 depending on the weather..in DM44...
  I will returning to DM42 late night  and will be running MSK 50.260
over night from DM42, and DM32..

Sunday morning I will start at 1500 in DM42, then DM43, DM33, and DM32,
and will circle those grids spending 2 hours in each until and circling
until end of contest.

I will have all bands 6 meters thru 10 GHz ,,

Digital modes on 6, 2, and 432 only..

Cw, SSB and FM on ALL bands,,
I will be on Rover Slack and this email
And cell# is 419-370-8802....so please get with me for ANY skeds or if
you want to try a contact..
Good luck to everyone..
Hope to work MANY of you ,,
Tom
N7GP/R
ex WA8WZG
6 meter Beacon 50.070 DM42dw
and others see WWW.AZVHF.ORG for details







--
Michael Daly
1408 Linda Drive
Gallup, NM 87301-5616
505-870-3430


N7GP/R Jan Vhf Contest plans

Tom
 

To All...
For JAN contest this weekend ...
I will be starting in DM31 At 1700 UTC,, BEFORE contest starts I will be on 50.265 MSK144 me 1st CM on and also FT8 around 2000 Hz DF... I will be there until 2100 UTC which is after contest starts.

Then I will move to DM32, DM33, DM42, DM43, and work the 4 grids until
around 0100 UTC Saturday night,, then head to DM 34 and POSSIBLY DM 44 depending on the weather..in DM44...
I will returning to DM42 late night and will be running MSK 50.260 over night from DM42, and DM32..

Sunday morning I will start at 1500 in DM42, then DM43, DM33, and DM32, and will circle those grids spending 2 hours in each until and circling until end of contest.

I will have all bands 6 meters thru 10 GHz ,,

Digital modes on 6, 2, and 432 only..

Cw, SSB and FM on ALL bands,,
I will be on Rover Slack and this email
And cell# is 419-370-8802....so please get with me for ANY skeds or if you want to try a contact..
Good luck to everyone..
Hope to work MANY of you ,,
Tom
N7GP/R
ex WA8WZG
6 meter Beacon 50.070 DM42dw
and others see WWW.AZVHF.ORG for details


Re: AA5PR/R contest roving

Michael Daly
 

I will operate from the home qth in Gallup. 6 meters, 2 meters and 432. SSB & CW.  Maybe FT4 if I get it loaded up
Mike
N5SJ, DM55pm

On Wed, Jan 12, 2022 at 10:03 PM John Klem <klemjf@...> wrote:
I'll be out this weekend for the contest.  My plan, with many
possibilities for deviations, is this:

Saturday
1900Z-1930Z    DM55xs
2100Z-2300Z    DM56wd
0115Z-0245Z    DM66kb

Sunday
1615Z to at least 1900Z    DM53uv
My morning in DM53 is mainly an attempt to work into southern AZ.  I may
stop elsewhere in DM53/64 with a better shot into Albuquerque on the way
home.

This time I'll have 6, 2, 432, and (new!) 1296.  All modes.

I'll be on Slack (both NMVHF and VHF-Chat), and welcome messages there
or via text to 505-373-4671.  Cell coverage might not be good in
DM53uv.  I'll also be trying to report my position via aprs.fi, but that
will probably fail for DM53.

Good luck,

John, AA5PR/R








AA5PR/R contest roving

John Klem
 

I'll be out this weekend for the contest.  My plan, with many possibilities for deviations, is this:

Saturday
1900Z-1930Z    DM55xs
2100Z-2300Z    DM56wd
0115Z-0245Z    DM66kb

Sunday
1615Z to at least 1900Z    DM53uv
My morning in DM53 is mainly an attempt to work into southern AZ.  I may stop elsewhere in DM53/64 with a better shot into Albuquerque on the way home.

This time I'll have 6, 2, 432, and (new!) 1296.  All modes.

I'll be on Slack (both NMVHF and VHF-Chat), and welcome messages there or via text to 505-373-4671.  Cell coverage might not be good in DM53uv.  I'll also be trying to report my position via aprs.fi, but that will probably fail for DM53.

Good luck,

John, AA5PR/R


222 MHz WAS

Mike WB2FKO
 

There is new life on 222:

https://www.arrl.org/news/growing-number-of-operators-completing-was-on-222-mhz <https://www.arrl.org/news/growing-number-of-operators-completing-was-on-222-mhz>

Footnotes: I contributed to K5QE's WAS when I gave him New Mexico using MSK144 and a 25W DEMI transverter on loan from Bill W7QQ. The path was around 800 miles and only took 20 minutes. I have also operated the K5QE contest station (east Texas in EM31) a few times and there is impressive hardware for 6--432 including a cross-polarized EME array for 222.

Good luck to all the contesters this weekend!

Mike WB2FKO EL89


KK6MC/r

James Duffey
 

I am doing my usual banana belt rove through Arizona Saturday and Sunday. My itinerary is below. 

The rover will have all bands 6M through 1296MHz. A Moxon on 6M, 8 ft Yagis on 2M through 432MHz, and 4 ft Yagis on 902MHz and 1296MHz.

I will operate SSB, CW, MSK144, FT4, and FT8. I will try to operate SSB and CW as long as there is activity there. In any case I will try to QSY to the  SSB/CW calling frequencies on 6M and 2M on the hour and half hour. I prefer FT4 on digital and you should too, but most of the activity is on FT8.Not sure how much MSK144 I will get done as I suspect that Sunday morning will be busy.

Good luck in the contest. - Duffey KK6MC 

January 2022 VHF Contest Route for KK6MC/r

 

Time in

Grid square

Time out

 

1900Z

DM45wa

1930Z

AZ77 North of Hopi Travel Plaza, E of Holbrook

2000Z

DM55cb

2130Z

Pintado Point, Petrified Forest

2200Z

DM54cb

2330Z

Blue Mesa, Petrified Forest

0130Z

DN44nh

0230Z

Scenic Overlook Mogollon Rim

Overnight in Phoenix

1500Z

DM42ax

1630Z

 

1645Z

DM32xx

1815Z

 

1830Z

DM33xx

2000Z

 

2015Z

DM43aa

2145Z

 

2345Z

DM34wg

0015Z

Agua Fria National Monument

 

DM45DE

 

If time, I will try to operate from Lowell Obs.


Re: 10GHz beacon project

Paul Probert
 

Bob,
  Hi, Paul Probert here.  I've been looking for a 10 GHz beacon to help with lining up and testing a 10 GHz station I'm putting together here in ABQ. So I'm glad to hear you are working on one up there in Los Alamos.  Maybe we can collaborate.  One of my neighbors used to do some work on the commercial antennas up on Sandia Crest and maybe he'd suggest somebody to talk to about getting permission to mount a beacon up there and give us some power to plug into.
  On the precision of the slots on your omni antenna I'm not sure but in my experience things like that work acceptably well without requiring super high precision.
   To build an omni one idea is to make some kind of disc-cone antenna.  Wouldn't need to be much but a couple copper cones mounted on the end of a piece of .141 inch hard line.  It would end up being vertically polarized.
   At the moment I have a VNA that can be used to check the SWR of any such antennas at X band.
   Did you have something in mind for your signal source?  For my station I've put together a synthesized source based on a YIG oscillator and a Rubidium reference.  Waay overkill for a beacon.  But I think there are a few synthesizer chips available these days with built in VCO's that might be acceptable.

Paul Probert


Re: 10GHz beacon project

redarlington
 

No location, we're just spitballing at this point, but it's real enough that I thought it worth mentioning here on the list.  My roof (or just above up on the tower) is in the shadow of Pajarito, so aiming half the power in that direction using an omni doesn't make an enormous amount of sense.   But I'm close with RMHAM and may be able to pull off some magic and get installed up on Pajarito on the tower up there, or maybe at another site at Sandia Peak.   Tackling the easiest bits first is where the antenna comes in.   That said, I've never had to hold a 0.003" tolerance, but have done much better than that for the fun of it.  Camera mounts for an old LANL project out to the limits of my calipers at whatever the temperature of the shop was at the time as an example.  The trick will involve doing some test cuts and see where they measure and adjusting from there.  With 6' of material, there's plenty to experiment with.  I'm also handy with microcontrollers (PIC in particular) and can whip up hardware to control the thing.   I'd be interested in stepping the power down between 3 levels and a CW ID, but running a stepped attenuator over months or years will be problematic.  No moving parts and adjusting input amplitude early in the RF chain with zero moving parts is probably better.  But that's for the future but worth thinking about now, as passively as it might be.

I was thinking roughly 2W but I'll see what's out there on the market.  This will be a long term year long thing should it gain momentum I think.   Input from the group is VERY welcome.  I'm new at all of this stuff.   As comfortable as I might feel at 23cm, 3cm is a world where I have limited capabilities to do any testing.

-Bob



On Wed, Dec 22, 2021 at 11:29 AM n6rmj <n6rmj@...> wrote:

Hello all

 

Very interested in the progress of the 10ghz beacon

Do you have a location where you are going to put it?

 

I am in the progress of getting my 4ft dish up and 30 watts at the antenna /digital ready

I live in dm25re Bullhead city az

I also go out rover  with 30inch dish and 30  watts / digital ready

 

I have a 10ghz digital group on facebook

And you are welcome there

 


Re: 10GHz beacon project

PATRICK COKER
 

Hello all

 

Very interested in the progress of the 10ghz beacon

Do you have a location where you are going to put it?

 

I am in the progress of getting my 4ft dish up and 30 watts at the antenna /digital ready

I live in dm25re Bullhead city az

I also go out rover  with 30inch dish and 30  watts / digital ready

 

I have a 10ghz digital group on facebook

And you are welcome there

 

From: main@nmvhf.groups.io [mailto:main@nmvhf.groups.io] On Behalf Of redarlington
Sent: Wednesday, December 22, 2021 10:55 AM
To: K Chapman
Cc: main@nmvhf.groups.io
Subject: Re: [nmvhf] 10GHz beacon project

 

I did get my needed info about the slots needing to line up "front to back", and was recommended to add wings for a better pattern.   We very much do want an omni and have various horn and choke ring feeds.   Smooshed flat round pattern is what we're after.   Maybe anyway, depending on a few things.  Thank you for the additional info.  I have a lot of homework to do before I cut any metal.

 

-Bob

 

On Wed, Dec 22, 2021 at 10:42 AM K Chapman <mailbox@...> wrote:

On 12/22/21 18:01, redarlington wrote:

Hi all,

 

I managed to find a 6' stick of WR90 with a choke flange at each end.  My plan is to work with a friend in Albuquerque to build a pair of slot antennas using W1GHZ's documentation and spreadsheet, and split the rest of the waveguide up between us.  

 

In just about every picture or video of these things, I see the slots go straight through from one side of the WR90 and out the other side, like they were done with a wire EDM machine (even when done on a mill).   My original plan was to mill one side, and flip the part and then do the other, which would leave me with slots that do not line up front to back.  My question is, does this matter?   Have CNC, can adapt, and all that.  But if the vertical slots are effectively horizontal dipoles, why would it matter if they were lined up with each other or not?

 

I'm more of a machinist than a microwave plumber, but I'm not much of a machinist ;-)

 

Thanks,

Bob - N3XKB in Los Alamos, NM

Yeah I just want to chime in here. I think you’ll want some gain at that frequency (slot antennas are roughly omnidirectional). If you have tooling it would be just as well to make a horn antenna or even a backfire antenna

https://www.antenna-theory.com/antennas/aperture/slot.php

https://www.pasternack.com/standard-gain-horn-waveguide-size-wr75-20-db-gain-sma-female-pe9855sf-20-p.aspx

https://www.researchgate.net/figure/Cylindrical-horn-antenna-with-8-12GHz-11_fig1_324433933

AK5Z


Re: 10GHz beacon project

James Duffey
 

A good rule of thumb when deciding tolerances of all kinds involving lengths of things in RF applications is the one degree rule. That is, a tolerance resulting in one degree of error is acceptable. There are 360° degrees per wavelength, so the tolerance is easy to figure out. For 10 GHz, or 3cm wavelength, that error is 3cm/360° = 1/120cm = 0.003 inches. That exceeds my matching capabilities, but you can probably do that with care. A looser rule of thumb is that tolerances should be held to 1/100 wavelength, which is about 0.010 inches. You should be able to do somewhere in-between, which I would guess is fine. Someone with a microwave modeling program like PUFF can verify this, but I no longer have access to those tools.  - Duffey KK6MC 

On Dec 22, 2021, at 11:54, redarlington <rdarlington@...> wrote:

I did get my needed info about the slots needing to line up "front to back", and was recommended to add wings for a better pattern.   We very much do want an omni and have various horn and choke ring feeds.   Smooshed flat round pattern is what we're after.   Maybe anyway, depending on a few things.  Thank you for the additional info.  I have a lot of homework to do before I cut any metal.

-Bob

On Wed, Dec 22, 2021 at 10:42 AM K Chapman <mailbox@...> wrote:
On 12/22/21 18:01, redarlington wrote:
Hi all,

I managed to find a 6' stick of WR90 with a choke flange at each end.  My plan is to work with a friend in Albuquerque to build a pair of slot antennas using W1GHZ's documentation and spreadsheet, and split the rest of the waveguide up between us.  

In just about every picture or video of these things, I see the slots go straight through from one side of the WR90 and out the other side, like they were done with a wire EDM machine (even when done on a mill).   My original plan was to mill one side, and flip the part and then do the other, which would leave me with slots that do not line up front to back.  My question is, does this matter?   Have CNC, can adapt, and all that.  But if the vertical slots are effectively horizontal dipoles, why would it matter if they were lined up with each other or not?

I'm more of a machinist than a microwave plumber, but I'm not much of a machinist ;-)

Thanks,
Bob - N3XKB in Los Alamos, NM

Yeah I just want to chime in here. I think you’ll want some gain at that frequency (slot antennas are roughly omnidirectional). If you have tooling it would be just as well to make a horn antenna or even a backfire antenna

https://www.antenna-theory.com/antennas/aperture/slot.php

https://www.pasternack.com/standard-gain-horn-waveguide-size-wr75-20-db-gain-sma-female-pe9855sf-20-p.aspx

https://www.researchgate.net/figure/Cylindrical-horn-antenna-with-8-12GHz-11_fig1_324433933

AK5Z



Re: 10GHz beacon project

redarlington
 

I did get my needed info about the slots needing to line up "front to back", and was recommended to add wings for a better pattern.   We very much do want an omni and have various horn and choke ring feeds.   Smooshed flat round pattern is what we're after.   Maybe anyway, depending on a few things.  Thank you for the additional info.  I have a lot of homework to do before I cut any metal.

-Bob

On Wed, Dec 22, 2021 at 10:42 AM K Chapman <mailbox@...> wrote:
On 12/22/21 18:01, redarlington wrote:
Hi all,

I managed to find a 6' stick of WR90 with a choke flange at each end.  My plan is to work with a friend in Albuquerque to build a pair of slot antennas using W1GHZ's documentation and spreadsheet, and split the rest of the waveguide up between us.  

In just about every picture or video of these things, I see the slots go straight through from one side of the WR90 and out the other side, like they were done with a wire EDM machine (even when done on a mill).   My original plan was to mill one side, and flip the part and then do the other, which would leave me with slots that do not line up front to back.  My question is, does this matter?   Have CNC, can adapt, and all that.  But if the vertical slots are effectively horizontal dipoles, why would it matter if they were lined up with each other or not?

I'm more of a machinist than a microwave plumber, but I'm not much of a machinist ;-)

Thanks,
Bob - N3XKB in Los Alamos, NM

Yeah I just want to chime in here. I think you’ll want some gain at that frequency (slot antennas are roughly omnidirectional). If you have tooling it would be just as well to make a horn antenna or even a backfire antenna

https://www.antenna-theory.com/antennas/aperture/slot.php

https://www.pasternack.com/standard-gain-horn-waveguide-size-wr75-20-db-gain-sma-female-pe9855sf-20-p.aspx

https://www.researchgate.net/figure/Cylindrical-horn-antenna-with-8-12GHz-11_fig1_324433933

AK5Z

1 - 20 of 1191