[Elecraft] K3 Mods

[Wes Stewart]

As I write I'm camped on 14.080 trying to work E4X on RTTY.  My K3 is set to mark=915.  I just set MMTTY to 2125 and I get full power on transmit.

Remember there was a VOX trip problem too.  That should not be affected by the mark freq.  It will however, as I wrote to John earlier, be affected by the Line In (Mic) gain setting.  This is the only radio I've ever seen where VOX sensitivity is changed by the microphone gain setting.

Wes

--- On Thu, 6/3/10, John E. Reiser <reiserj at optonline.net> wrote:

From: John E. Reiser <reiserj at optonline.net>
Subject: Re: [Elecraft] K3 Mods
To: nf4l at nf4l.com, elecraft at mailman.qth.net
Date: Thursday, June 3, 2010, 6:33 PM

Hi Mike, NF4L,

Another great suggestion!  I forgot to check this, and will do so in the 
morning.  Is this net great, or what!

Many thanks and VY 73,

John


----- Original Message ----- 
From: "Mike" <nf4l at nf4l.com>
To: "John E. Reiser" <reiserj at optonline.net>
Sent: Thursday, June 03, 2010 7:51 PM
Subject: Re: [Elecraft] K3 Mods


> Be sure the mark frequency is the same in the K3 as it is in MMTTY. That 
> bit me once.
>
> 73, Mike NF4L
>
> John E. Reiser wrote:
>> Hello Everyone,
>>
>> Yesterday, I did the following mods for my K3 #384, running FW 3.99:
>>
>> K3DSPUPGD
>>
>> K3 Negative ALC and External Band Data Pull-up Mod
>>
>> Front Panel Mike Circuit Mod
>>
>> IF Buffer Gain Mod.
>>
>> I was scrupulous about ESD precautions, using a wrist strap and 
>> anti-static mat.
>>
>> Before the mods, everything worked perfectly.
>>
>>
>>
>> After the mods, receive seems OK, audio is improved, but I have some 
>> problems on transmit:
>>
>> 1)  Attempting to transmit RTTY with MMTTY now produces no RF output from 
>> the K3.  I use AFSK A for RTTY.  It seems like I have no T/R switching. 
>> Tune, CW and SSB work correctly and produce the expected output levels.
>>
>> 2)  The K3 does not key up my ACOM 1000 amp on Tune or CW.  It keys the 
>> amp OK on SSB when the PTT button on the mike is pressed.  It also keys 
>> the amp OK in CW mode if the mike PTT button is held down.  I checked 
>> that VOX is enabled for CW.  RTTY produces no output from the amp under 
>> any circumstances.
>>
>> I have reloaded FW 3.99, and then went back to version 3.97 (all files), 
>> but the problems remain.  I have checked and rechecked and rechecked all 
>> cable connections to the K3 back panel, as well as my CONFIG and MMTTY 
>> settings.  Everything looks OK, but I may have missed something.  BTW, I 
>> don't use ALC with the amp.
>>
>>
>>
>> To summarize the problems:
>>
>> 1) The K3 produces no output in RTTY
>>
>> 2) The Key Out jack (for keying the amp) does not function with VOX.
>>
>>
>>
>> Any ideas?
>>
>> Many thanks and 73,
>>
>> John, W2GW
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>
>
> 


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