[Elecraft] XV144 - power out with no drive

[Don Wilhelm]

Stewart,

What input level do you have the XV144 set for?  The 1mW level from the 
KXV3 or the high power input from the K3 ANT1 or ANT2 jacks?
It is important that I know before I can venture a reasonable guess.

Are you using the Elecraft transverter cable to operate the XV144, or do 
you have it configured for non-Elecraft and keying it with the PTT line 
(you should have one or the other, but not both).  See the XVnnn Owner's 
Manual.


One thing you can do is see if the XV144 is staying in transmit when it 
should be switching back to receive.  When in receive, what is the 
voltage at the cathode of D4 - this is the 12T signal and should be zero 
during receive.

The "all flashing LEDs" condition is an indication of an overload 
condition or getting RF input while the XV144 is still in receive. If 
you are using the 1 mW RF input, it should never trigger that condition.
There are some XVnnn transverters that falsely detect an overload 
condition.  That is due to noise on the COR detection line.  An easy 
cure for that is to remove the front panel metalwork and solder a 0.1uf 
capacitor between the collector and emitter of Front Panel Q7.  It can 
easily be added to the solder side of Q7 without removing the front 
panel board.

73,
Don W3FPR

On 12/14/2014 9:52 AM, Stewart GM4AFF wrote:
> I have an intermittent problem with my XV144 (driven by a K3). On transmit I
> can see power output on the LEDs (3 greens) even when there is no audio
> input and the transverter is getting quite hot. Stations tell me my signal
> sounds fine with no background noise. So it's generating RF somewhere else!
>
>   
>
> Also, more seriously, occasionally, when I return to receive after
> transmitting, the transverter LEDs all illuminate, I lose receive
> sensitivity almost completely, although I can still barely hear louder
> signals. The transverter won't transmit unless I switch off and on the K3
> and the XV144. This occurs more often as the transverter heats up.
>
>