[Elecraft] K3: Main RX gone deaf

[Ionut Pitu]

Then you should check also D25 from the RF board.The easiest way to find out the problem is to inject signal at different point in the rx chain and see where it stops working, or where it starts working,hi!
Good luck!BobYO8RNI

      From: Udo Langenohl - DK5YA <dk5ya at dk5ya.de>
 To: Jerry <ajermo at carolinaheli.com>; Graham g3tct <g3tct at g3tct.co.uk> 
Cc: Elecraft at mailman.qth.net
 Sent: Monday, April 25, 2016 11:02 PM
 Subject: Re: [Elecraft] K3: Main RX gone deaf
   
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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