[Elecraft] K3: Main RX gone deaf

[Udo Langenohl - DK5YA]

Gentleman,

thanks for all so many replies. Will try to check all ideas tomorrow, 
XYL permitting ... ;-).

73 Udo, DK5YA

P.S.: The issue occurs at the RX IN and TVTR IN ports of the KXV3A too.

Am 25.04.2016 um 17:57 schrieb Jerry:
> Reseat the internal coax jumpers in the surf signal path.
>
> Sent from my iPad
>
>> On Apr 25, 2016, at 11:52 AM, Graham g3tct <g3tct at g3tct.co.uk> wrote:
>>
>> Hi Udo
>> Before you start tearing the rig apart, two ideas:-
>>
>> -is there a big difference for weak signals of say S4?
>> -if not, it may just be the S meter calibration that needs attention.
>> -if so, preamp on for either? Att on for main?
>>
>> HTH
>> Graham
>>
>>> On 19:59, Udo Langenohl - DK5YA wrote:
>>> 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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>

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