Re: Chineses TCXO for 28 MHz IF 2M transverters


Hi Keith,

One thing about ref oscillators:  I use 5 volt dc powered oscillators especially portable ops. They need a regulated and filtered supply so one must have adequate headroom for the regulator. 10 or 12 vdc oscillators won’t get it done.  OK for home use. 

I’ve used several CTI-196 units but they’re pretty expensive now at abt $30 each. They do sine outputs at 10 ^-5. Good enuf for 10 and 24. Pyrojoseph still has them on ebay. 

Looking for smaller units a little smaller than a postage stamp. Need to be 5v, sine out at 2-3 volts pp 10 MHz.

73 Bill W7QQ 

On Dec 8, 2018, at 9:22 AM, Keith Morehouse <w9rm@...> wrote:

I don't know how good these are or what the ultimate output level is, but this is the frequency you need if you want to stabilize your older DEMI (or whoever) 144 MHz transverter.  They are being sold by the pair, so you have one to break and one to use.  They shouldn't be too hard to integrate into almost any 28 MHz IF transverter.  Look up the specs of your mixer for LO power requirements, check this one and then either pad it down or, more likely use it as is or drop a 0.99$ MMIC in as a buffer amp. I am sucked in for a pair.

I've had a EBay search active for this frequency TCXO for two years and this is the first usable (hopefully) unit that has come up.  I messaged the seller to make SURE it was a sine-wave output (most of these are clock oscillators with TTL or CMOS square-wave's output) and he verified it was sine-wave.  If not, I guess I could legit return it by showing EBay his message.

I bought a TCXO advertised just like this as a drop-in for a Yaesu FT817 and it worked fine and was dead on freq, out of the package.  It was 20% the cost of a Yaesu equiv part.


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

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