|
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
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:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
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
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:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
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
toggle quoted messageShow quoted text
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: 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:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: 10GHz beacon project
K Chapman
On 12/22/21 18:01, redarlington wrote:
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.researchgate.net/figure/Cylindrical-horn-antenna-with-8-12GHz-11_fig1_324433933 AK5Z
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
10GHz beacon project
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
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: VHF Contest Survey
David Hollander
Hi Duffey - I completed the survey.
73, Dave N7RK -- Dave Hollander N7RK Arizona Tube Supply http://arizonatubesupply.com Ham Radio Page http://n7rk.com
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: VHF Contest Survey
Michael Daly
Jim, I completed the survey Mike
On Sun, Dec 19, 2021 at 6:43 PM James Duffey <JamesDuffey@...> wrote:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
VHF Contest Survey
James Duffey
All - If you have participated in a VHF+ contest in the last 2 years and included your e-mail address in your log submission, you should have received an invitation to complete a survey on the impact of digital modes on your VHF contest operation. If you did not receive an e-mail, you can complete the survey by going to < surveymonkey.com/r/VHF-Contest-Survey-2021 > . In addition to the formatted questions, there is space on the survey to fill in individual comments.
The poll closes December 27, so there is a fairly short window to get your input in. Whatever your feelings on the digital modes are, please complete the form. Thanks - Duffey KK6MC
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
KK6MC/r on APRS
James Duffey
I neglected to mention that I will be sending my position on APRS when I have coverage.
toggle quoted messageShow quoted text
James Duffey KK6MC Cedar Crest NM
On Sep 10, 2021, at 12:12, James Duffey <jamesduffey@...> wrote:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
WSJT-X QSY
James Duffey
If I work you on FT8 or FT4, and, please do try FT4, I will QSY to 2M if we worked on 6M, and to 6M if we worked on 2M. If we complete on 2M, let's try 432MHz. If you have 222MHz, we can try that as well. This worked for John and I in July.
toggle quoted messageShow quoted text
Sorry I forgot this the first time around. - Duffey KK6MC
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
KK6MC/r itinerary
James Duffey
Here is the KK6MC/r itinerary for the September 2021 VHF contest. As always, schedule is flexible and has some contingency built in, but it never seems like enough. If conditions are good, I may be delayed. If they are poor, I will slow up. You can text me or phone me at (505) 228-5491. I will also be on Slack. Current plan is to be on 4 bands, 6M, 2M, 222MHz and 432MHz. I will have SSB, CW, and WSJT-X. I intend to go to the analog modes on the hour and half hour. 6M Moxon and 100W 2M 8 ft Yagi and 100W 222MHz 8 ft Yagi and 30W 432MHz 8 ft Yagi and 50 W See you in the contest. Listen for the weak ones. - Duffey
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: N7GP/R Sept. Contest plans
Tom
Sounds great Ed
toggle quoted messageShow quoted text
On 2021-09-09 10:59, Ed wrote:
Will look for you.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: N7GP/R Sept. Contest plans
Ed
Will look for you. N5JEH --
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: N7GP/R Sept. Contest plans
John Stanford
Wow Tom I’m impressed! I’ll look forward you on Sunday. John, KF6I
On Thu, Sep 9, 2021 at 9:46 AM Tom <wa8wzg@...> wrote: To All.. --
John Stanford - President Tork Technologies, LLC dba Island Amplifier USA (714) 412-7399 ARS KF6I
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
N7GP/R Sept. Contest plans
Tom
To All..
Due to work commitments, I will not be starting my Rover operation until Saturday 6 pm AZ LOCAL time ,,I.E..0100 UTC Sunday,, I will start in the 4 corner are of DM32, DM33, DM42, DM43 and circle that until 10 PM,,, Over night I will be on msk144 50.260 from DM42 And DM43... Sunday morning I will be back on the road by 1500 UTC ,, 8 am local AZ time again in the 4 corner DM32, DM33, DM42, DM43.. Then in afternoon Sunday I will work my way to DM34, DM44 and If time permits DM45 and will be active until the end of the contest Sunday night... 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 email address above 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 2 meter Beacon 144.055 222 Beacon 222.068 432 Beacon 432.055
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: September VHF Event
John Klem
My plan is to operate Saturday only, starting in DM53xx and
moving just a bit at some point to DM54, depending on activity. I
think I'll have internet there, so look for me on the NMVHF slack
chat channel for coordination, or feel free to send me a text at
505-373-4671 or 505-339-5411. SSB, CW, FT8. 2 m: 6 el. yagi 100 W 432: 11 el. yagi 50 W John, AA5PR/R
On 9/7/2021 6:53 PM, Kyle Best, KC0LFQ
via groups.io wrote:
Wondering if anyone is planning to work the VHF contest this weekend. I am thinking about going down to Gallinas Peak (DM74cf) on Saturday morning. See if I can maybe work the locals on 6m, 2m and 70cm back in Albuquerque. I don't plan to make it an overnight, since I won't have an FT-8 computer setup with my current power budget (45 watt solar panel and a battery), and once the local contacts have been worked, there's not much sense waiting around on 6m for a ssb contact to show up.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
September VHF Event
David Jarmuth
I will likely be participating both days from here in Colorado Springs ( DM78pv ). Probably 6m, 5m, and 70cm SSB. I know that may not help you guys too much, but I have worked N5JEH in Albuquerque before, so it is possible! 73's, David KB0KQI
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: September VHF Event
Hi Mike,
I will be portable at the south rim of the Grand Canyon at DM45aw. I'll be on 6 thru 1296 with long boom yagis on 2 meters and up. A loop on 6. SSB,CW,FT8. When I get up there tomorrow I will run a terrain analysis for your direction.
Good luck in the contest!
Doug, K7EME
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Michael Daly <arrowengineering1@...>
Date: 9/8/21 4:49 AM (GMT-07:00)
To: main@nmvhf.groups.io, klemjf@...
Subject: Re: [nmvhf] September VHF Event
I will be operating from the home QTH in Gallup, DM55pm. 6 2 & 432 ssb and cw. Mike, n5sj
Michael Daly 1408 Linda Drive Gallup, NM 87301-5616 Cell: 505-870-3430 e-mail: arrowengineering1@...
From: main@nmvhf.groups.io <main@nmvhf.groups.io>
On Behalf Of John Klem
I'll be participating, but probably Saturday only as well, and a very limited rove. I'll post again when I have it figured out. John, AA5PR On 9/7/2021 6:53 PM, Kyle Best, KC0LFQ via groups.io wrote:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||