[Elecraft] XV50 problem is worst ! Need help.

[Siu Johnny]

Hi Jean,

First of all, I have to admit that I am not an expert and would suggest you 
contact Gary of Elecraft.

>From what you describe, you are ok on tx.  Then you should concentrate 
yourself on RX route.  Check all the soldering points around U1and K2 areas 
first and then followed by later stages in the RX route e.g. ADEX-10H etc

If you have a good attentuator such as AT1, input a weak weak 50Mhz signal 
(or noise generator) at the antenna port J1 via the RF attentuator.  Use 
another 50mhz receiver with a RF probe to trace the signal along the RX 
path to see whether there is a break in the signal path.

Remember, use an RF attentuator in front of the antenna port

73

Johnny VR2XMC


From: Jean-François Ménard <va2vyz at yahoo.ca>
To: elecraft at mailman.qth.net
Subject: [Elecraft] XV50 problem is worst ! Need help.
Date: Thu, 11 Jan 2007 20:45:14 -0500

Hi to all,

Last week, my transverter XV50 was unable to receive properly... Only  a 
small voice in the background... no S unit... the guy normally give  me 10 
or 20 over S9...  After a new alignment procedure, I was unable  to peak 
R13 to the desired level. I was unable to get more than 0.043  V. So my 
conclusion was that Q3 is dead.

I received a new Q3 transistor. Now it is installed. I did another  
alignement. Now with Q3, I can peak R13 very easy to the target of  250mV. 
Note that before and now, my TX is still perfect. So no  trouble with TX.

But even after Q3 changed.... it is worst. I do not receive anything  at 
all... not even a small voice in the background.

If I listen to the background noise.... with or without antenna, it  is the 
same. On the receiver input aligment, my noise generator did  not make any 
difference ON or OFF.

So I really don't know where to start now. I don't have very much  
experience in finding trouble.

If someone could coach me where to start, I will really  appreciate... :-((

Thanks for your times.

===========================

Jean-François Ménard / VA2VYZ
Elecraft K2 #4130 KX1 #999
FISTS #11896
SKCC #2245


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