Dave,
Pretty much no-issue if using the transverter interface at mw level
as that causes no heating in transmit. TCXO-3 plus EXREF keeps 28
MHz within 2-Hz* and that is additive to transverter freq error not
multiplicative. Xtal LO in UHF transverters are typically multiplied
so using good temp practises or locking with a PLL are helpful. My
432 and 1296 transverters are locked to 10-MHz reference and K3 has
EXREF so total drift is < +/- 2 Hz on 432 and 1296.
If your K3 has the TCXO-1 with 5ppm then you may see freq offsets as
high as 5*28 = 140 Hz. With TCXO-3 1ppm is 28 Hz and EXREF is 0.1ppm
or 2.8 Hz. Actually the TCXO-3 runs nearer to 0.5ppm without
reference correction.
*
http://www.kl7uw.com/K3EXREF.htm73, Ed - KL7UW
---------------------------------------------------------------
Yes. I'm a stickler for accuracy. It always bothered me that the
so-called 'temperature compensated' LO in the K3 was not actively being
steered by temperature compensation (i.e. I could only put static
temperature offsets into the rig memory from the data sheet that came
with the oscillator). That was a 'feature' that was never released. At
HF frequencies, it was only an annoyance, but using UHF transverters,
the error compounds (I'm using a crystal oven in my UHF transverter, but
the lack of one in the K3 caused drifting).
I use a Citizen watch with WWVB reception, so the time on my wrist is
never more than 50 ms off.
Anally yours,
-- Dave, N8SBE
73, Ed - KL7UW
http://www.kl7uw.comDubus-NA Business mail:
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