Mark
You can check the performance of your XV222 receiver amplifiers with only a
common voltmeter.
Take off the top cover of the transverter, check the voltage between TP2 and
ground (should be between 200 to 275 millivolts). That measures part of the
source voltage of Q3, the first receiver amplifier.
Find R16 (a 120 ohm resistor) and measure the voltage to ground on each side of
the resistor. One side should be 12 volts, the other should be about 5 volts.
That measures the series dropping resistor for U1, the second receiver
amplifier. R16 will normally be very warm to the touch.
If those measurements are correct, the problem is most likely elsewhere.
You can check the condition of the local oscillator by measuring the voltage
between TP1 and ground. It should be between 1.0 and 1.5 volts.
The part and test point locations are shown in the Transverter Owners Manual,
page A-4, available on the Elecraft web site.
Good luck!
73, Mike, W3IP
On Thursday, September 17, 2020, 8:58:35 PM EDT, k2qo <msadam...@gmail.com>
wrote:
During the recent September VHF contest I could only hear the absolute
strongest local stations on the XV222/K3 in my rover. It worked FB in June.
My XV432 worked just OK as usual. Stations told me I was the loudest signal
on the 222 band so the TX side is fine.
I put it on the bench and connected my Elecraft N-Gen. When turned on I
could barely detect an increase in noise. Tried the same on my XV432 and it
went from S0/1 to a solid S9.
I'm guessing that I somehow blew up U1 (an ERA6) and/or Q3 (an ATF 34143). I
don't have a good scope, RF generator, or RF voltmeter but kinda think
replacing both will fix my XV. A bad relay is an option too.
Thoughts? I'd like to fix it to have for a spare as I plan on moving
non-BigE transverters for 222 and 432.
73,
Mark K2QO
NF2RS/R for the September VHF
--
Sent from: http://elecraft.365791.n2.nabble.com/
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to m.cre...@yahoo.com
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
