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Someone has already done spectral testing of similar units (link
below). It's a long read, but the bottom line is that at least
some of these are very likely to be (cheap!) synthesizers, with
spurs and higher phase noise than you will find in a good TXCO.
The article documents degraded receiver performance.
At least those of us in "rich" RF environments might be better
off avoiding them. On the transmit side, it might also be kinder
to our nearby amateur friends. Still, in some cases (like Keith's
transverter LO) there may not be better options.
On 12/8/2018 9:22 AM, Keith Morehouse
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
Calmesa Partners G.P.