[Elecraft] XV144 - power out with no drive

[Don Wilhelm]

David,

To answer your question, no it has not been incorporated on the XV series.

Some transverters are just fine without it, but some others show that 
problem behavior.
I usually add it to any XV transverter that I service, and I would 
encourage any owner to do the same.  It simply filters any noise off 
that signal line whose only component should be DC.

73,
Don W3FPR

On 12/15/2014 4:58 AM, David G4DMP wrote:
> Magic! I have just read your advice to Stewart GM4AFF and recognised a
> phenomenon I have been getting with my XV144 for years. I had assumed
> that the flashing LEDs were due to my fault in overdriving.
>
> I have just added a 0.1 across E & C of Q7 and that has cured the
> problem.  I must now do the same with my XV70.
>
> Am I to assume that this mod has now been incorporated in new XV---
> kits?
>
> I am ever thankful to you, Don, for your valuable contribution to the
> reflector.
>
> 73 de David G4DMP
>
> In a recent message, Don Wilhelm <w3fpr at embarqmail.com> writes
>> 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.