[Elecraft] K3: Main RX gone deaf

[Gary Smith]

Udo,

I'm not one of the more knowledgeable 
people on the list and hopefully, somebody 
with better knowledge than me helps you 
more. But with that, this is what I would 
look at if it were my radio...

1. Are your crystal filters set up 
properly; Could they be in reverse order 
between slots 1-5 on the main board and 
sub receiver? 

If they are in the identical order, have 
you set the K3 up to know what crystals 
are in there and, do you have the order of 
the crystals correct using the K3 Utility? 
If you have one bank listed opposite in 
the filter configuration, this will not 
work properly.

2. When Using B set; do you have the 
filters set the same on both Sub & main? 

Do you have the antennas set properly for 
the main as well as sub Rx? Could your 
main antenna for RX be listening to the 
wrong antenna?

It's good you have two K3's: What you 
might do is have both of the K3's you 
have, side by side and check each setting, 
comparing the known good one to the 
settings on the one you're having trouble 
with. 

3. Have you tried your good radio in place 
of your K3 that has the issues? 
Conversely, have you tried your problem K3 
in the location your good K3 is? Perhaps 
there is a problem with the coax or 
antenna connections?

Hopefully you will find your answer 
without having to have anything repaired.

73 & Happy hunting,

Gary
KA1J

> Gentleman,
> 
> I'm struggling with a Main RX vs. Sub RX issue. My Main RX is rather 
> deaf compared to the Sub RX. I see at least 23.5dB attenuation between 
> Main RX and Sub RX when comparing highly stable signals from my signal 
> generator (HP8664A). This is only for ANT1/2 vs. AUX-IN!
> Example:
> -33dBm on 28.500
> into AUX-IN (SUB RX): exactly 59 +40dB
> into ANT 1 (Main RX): 59 +15dB
> into ANT 2 (Main RX): 59 +15dB
> 
> I've checked all the usual suspects (pin diodes):
> D1 and D5 on the KXV3A: o.k.
> Each and every pin diode on the SUB IN board: o.k.
> D5 on the Main RX board: o.k.
> 
> This is a K3 #59xx with almost everything inside money can buy.
> 
> My second K3 (serial #39xx) does not show this strange behavior. Main RX 
> and SUB RX show exactly the same values on ANT1/2 and AUX IN. -33dBm is 
> 59+40 on MAIN and SUB RX, no matter if Ant1, 2 or AUX IN.
> 
> Any idea? I'm searching for weeks now and I'm close to give up.
> 
> Udo, DK5YA
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