[Elecraft] K3 Mods

[John E. Reiser]

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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>
>
>