[Elecraft] K3 - RX Problem after latest firmware update

[Greg - AB7R]

This was true with some early optional TCXO-3 units that had exposed SMDs on the bottom of the can.  There was a capacitor that 
could potential short to the metal socket where the missing pin would have been.  Hence the addition of the insulation.  This is 
not a problem with the standard reference oscillator as there are no exposed parts on the bottom.

Stewart, Do you have the optional TCXO-3 and what is the radio's serial number?

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
K3#0009 and 0319

On Mon Mar 10 13:16 , "Bruce Bowman"  sent:

>Hi Stewart-
>
>Like you, I had a problem with my K3 going dead. Unlike you, I bought a 
>factory-built unit. I did that because I wanted to know it was working 
>properly from the start. That turned out to be one of those things that 
>sounds like a good idea but doesn't withstand close scrutiny.
>
>What I saw initially was an occasional error message (ERR PL1) when 
>switching to another band, then the audio would decay to nothing over a 
>2 second period. Sometimes I could get it to recover by chnaging bands, 
>sometimes not.
>
>Since it was factory built, they had me return my K3. They found the 
>TCXO3-1 oscillator was grounding occasionally. The oscillator would 
>continue to operate, but grounding it (the case? some component? dunno) 
>caused the frequency to be pulled about 20 KHz and the receiver would 
>die. They replaced the oscillator (probably unnecessary), added an 
>insulator and re-ran VCO calibration. It's been rock-solid ever since.
>
>Bruce, NM5B
>Santa Fe, NM
>
>----- Original Message ----- 
>From: "Stewart Baker" stewart at baker.nildram.co.uk>
>To: "AB7R" ab7r at cablespeed.com>; "Elecraft Reflector" 
>elecraft at mailman.qth.net>
>Sent: Monday, March 10, 2008 5:33 AM
>Subject: RE: [Elecraft] K3 - RX Problem after latest firmware update
>
>
>Greg,
>Have re-installed V1.75 & V1.57 again, no change.
>
>Here is a sequence which you might like to try:-
>
>POWER
>80m LSB 3780
>NORM
>LO CUT=0.15
>SAV ALT1
>NORM
>TX ON/OFF
>ALT1
>TX ON/OFF
>Receive may be dead at this point
>
>If not continue with
>Select USB
>ALT1
>TX ON/OFF
>Receive dead
>
>Switching bands, modes or NORM always restores receiver.
>
>I do (from my point of view) hope that I am not the only one with
>this funny..
>
>73
>Stewart G3RXQ
>
>On Sun, 9 Mar 2008 12:30:15 -0700, AB7R wrote:
>> Stewart,
>>
>> Try installing the new firmware again.  I just tried to recreate
>your report
>> and the radio performs as expected...no problem with RX after a
>transmit
>> with ALT1 set to 0.15 on the LO side.
>>
>> 73
>> Greg
>> AB7R
>>
>>
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net
>> [elecraft-bounces at mailman.qth.net','','','')">elecraft-bounces at mailman.qth.net]On Behalf Of Stewart
>Baker
>> Sent: Sunday, March 09, 2008 11:32 AM
>> To: Elecraft Reflector
>> Subject: [Elecraft] K3 - RX Problem after latest firmware update
>>
>>
>> I am not sure if there is an obscure problem after the latest
>MCU
>> and DSP update. Maybe others could check and see if it happens
>to
>> them ?
>>
>> Any band on SSB if I have the DSP set to ALT1 with the Low Cut
>set
>> at 0.15 Hz , then after going onto transmit the receiver appears
>> to be dead. If I set the DSP to NORM by pressing the knob the
>> receiver suddenly bursts into life...
>> This happens whether there is any transmit audio or RF out.
>>
>> 73
>> Stewart G3RXQ
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