[Elecraft] XV-144 Receiver RF Amp Bias Adjustments

[KJ4YQK]

Hi Don,  

I had to order some resistors on line, got a box of them now.  I am still
not getting the voltage that I should be getting.   I check for 12R voltage
at the top of R16  and C29 and see nothing.   12R voltage comes from the K5
relay.  

 

I check the run between K5 to R16 it looks good.  

 

I check the output of U4 and it is good.    Looking at the schematics I
think I should be getting 12 volts from U4 via K5 12R..   The schematics are
showing K5 in it's natural state with no power apply.  I am not seeing any
connection between K5 and U4 (I am thinking pin1) or none of the pins  on
the board.    I see where U4 should have 0 ohms to one of the pins in K5 but
don't see it.  

 

Having problem finding the board run between U4 and K5.

 

Am I  reading this right?    

 

Thanks David

 

 

From: Don Wilhelm-4 [via Elecraft]
[mailto:ml-node+6613984-1326534961-347528 at n2.nabble.com] 
Sent: Saturday, July 23, 2011 1:18 PM
To: KJ4YQK
Subject: Re: XV-144 Receiver RF Amp Bias Adjustments

 

David, 

If you found zero volts at D3, then R12 is not fully soldered.  OTOH, if 
you found close to 12 volts, D3 is not doing its job. 

Good luck on finding parts at RS if it is anything like the store in my 
area. 

73, 
Don W3FPR 

On 7/23/2011 9:38 AM, KJ4YQK wrote: 


> Hi Don, 
> 
> 
> 
>     Tnxs for the reply.  I broke a resister R14, lifting one end to read.
It 
> check good before the lead broke off.  Head to Radio Shack to pick up a
new 
> one.  I did not get the 6.8 volt at the C4 D3 Junction.  I will retouch
the 
> solder joints with the iron to see if it comes back.  Will pick up an
extra 
> D3 while I am radio shack just in case. 
> 
> 

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