Dave,
I bought my KX3 primarily for use as144-MHz mw IF. I did some
extensive freq measurements at 6m (before the 2m module was
available). I added an aftermarket heat sink and then ran the temp
comp routine. I simulated running JT65, which has continuous carrier
for 50 seconds out of 2 minute sequences and found max drift was
about 12-Hz. That existed for the first two sequences and then drift
dropped down to about 5-Hz (apparently residual heat held the offset
for a longer time).
Since the 2m module utilizes a 55-MHz IF I would expect about the
same performance. Actually depends on power output and 2m max is 3w
vs the 5w test I ran on 6m. Seems 12-Hz variation on 10-GHz would
not be troublesome if the mw LO was phase locked to a reference. I
have measured my 10-GHz LO to be about 17-Hz off frequency (no
discernable drift) mainly due to frequency error in my OCXO on 10-MHz
(which is multiplied to 10,224.000 MHz from 1,036 MHz). I drive my
DEMI 10G transverter at 1w on 144-MHz so drift would even be better.
So freq accuracy is < 17+12 Hz at 10,368 MHz. Much better than the
old Xosc system with the FT-817 which could be several KHz off freq.
I use an EIP538 mw freq counter which I check against a Rb source (5x E-11).
73, Ed - KL7UW
From: Dave AD6A <[email protected]>
To: Nr4c <[email protected]>
Cc: [email protected]
Subject: Re: [Elecraft] KX3 Feature Ask
A great little radio it is, agreed. I have two of them that I use as
I.F. radios on my 10 & 24GHz portable microwave station setups. They
are perfect for that function, using the 2m option as the I.F.
especially when mated with a PX3. I drag my microwave gear all over
the place, including mountain tops. I phase lock my microwave
transverters to a GPS disciplined 10MHz OCXO and would simply like to
be able to do the same with the I.F. radio so that I know exactly
what frequency I'm on, especially when looking for exceedingly weak
transmissions. I know for sure there are many of us microwavers that
do the same thing.
FWIW I have a fully loaded K3s in my home station that's also locked
to a GPS standard, as is all my RF test equipment.
Regards,
Dave AD6A
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
[email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
