[Boatanchors] Boatanchors Digest, Vol 114, Issue 6

[Jim Wilhite]

Is there any relays involved for switching from RX to TX?  Maybe the 
contacts on one end or the other is not making right?

Jim
W5JO

----- Original Message ----- 

> Hi guys. I did subscribe to the Swan Group on Yahoo yesterday.... Of 
> course, the first looong posting I tried bounced... Ah, well.
>
> Here's what I think is the root of my problem, please bear with me:
>
> I have 2 nice Swan 250Cs (I know, I know). Both receive excellent, and 
> exactly the same, when using my HP 606A SG. One has NO xmit output. I have 
> discovered this is a common problem with these radios.
>
> Not being an x-spurt on xtal filters, I measured the in-circuit resistance 
> of the xtal filters.
> The 'good' radio measures 300K ohms. The 'bad' radio measures 36M ohms. I 
> got to this point by 'scoping the signal. Very little carrier balance seen 
> on the scope. The manual is very cryptic on xmitter alignment.
>
> Since the local Radio Shack is out of Swan IF Filters...... I just can't 
> understand why both receivers are exactly the same, but no xmit. The block 
> diagram shows a signal path through the IF Filter???? Yeah, I can swap 
> them, but I need to understand the problem......
>
> Strange, indeed........
>
> thank you,
>
> ron
> N4UE
>
>