[Elecraft] XV-144 Receiver RF Amp Bias Adjustments

[KJ4YQK]

Hi Don,

Reposting Here I don't think my post are making in via outlook.  Anyway here
is where I am at.  

1.  Yes I have 12 volts on the cathode of D14, but no voltage on the anode. 
D19 had 12 volts on the cathode and 6 volts on the anode.  

2.  Been over the jumpers about 10 times now.  My settings are as follow on
page 9.
JP1: 1-2  JP2:2-3  JP9: 1-2
1 milliwatt  JP3: 1-2  JP4:1-2  JP5 2-3 JP6 2-3

JP7 Shorting block has jumper on it and no shorting block on JP8

Front Panel Board has a jumper on JP1.  


3.  Not sure if you got my  last email.  Just in case.  I was thinking Q3
might be bad because I had to move it from the front side of the board to
the back side.  I pulled Q3  and it check good.  I went ahead and replace it
with a new one.  

4.  Retouch most of the solder joints around the relays and the pre-amp
section.  Including the R12.


Question (not sure if I have this right in my reading of the diagrams):  Q3
(front panel) sends a ground to D14 (main board) when the radio is power up
by a positive signal from U4(front panel).  The PWR En signal maybe, just
wondering if I am reading this right.  If a ground appears on the anode of
D14 the diode causing forward bias, and the voltage should drop below 12
volts to like 6 volts causing K4 to activate.   

Thanks David 


--
View this message in context: http://elecraft.365791.n2.nabble.com/XV-144-Receiver-RF-Amp-Bias-Adjustments-tp6612768p6636816.html
Sent from the Elecraft mailing list archive at Nabble.com.