[Elecraft] Two issues with data transmission

[Richard Ferch]

Barney,

Re the first problem, I suspect your LINE IN level may be sitting on 
zero. With the radio in DATA A or AFSK A mode, make sure your MIC SEL is 
set to LINE IN (I believe this is the default in DATA A and AFSK A 
modes, but if not you can set it using the MENU button). Now turning the 
MIC gain control will adjust the LINE IN level. You should set the meter 
to display ALC and then adjust the LINE IN level (and/or the SignaLink's 
output level) until you see 4-5 bars of "ALC" reading on the K3. Use the 
PWR control to select the desired output power. In modes that require 
high linearity, like PSK, stay below one-half the radio's power rating 
(i.e. between 12 and 50 watts or below 5 watts) to avoid clipping on 
momentary peaks.

Re the second problem, is your SignaLink connected to the radio's PTT 
input? If it is, you should make sure that your software is *not* 
configured to control PTT. In particular, make sure that it is not using 
software commands for PTT. Also, you should turn the radio's VOX off. 
The SignaLink has its own VOX circuit that controls PTT for you. There 
is no need for an additional PTT method, and in fact using two methods 
simultaneously can cause this problem. The K3 appears to be vulnerable 
to a "race condition", in which sending a software RX command 
simultaneously with switching hardware PTT (or the radio's VOX) can 
leave the radio in transmit.

73,
Rich VE3KI

K3LA wrote:

> I recently tried to set up my K3 for data usage and two problems arose. I am
> using a signalink interface. I have tried to use both FLDIGI and HRD and the
> problems are present in both cases.
> First there appears to be audio coming out of the Signalink but no rf output
> and I am hearing nothing from the monitor out.
> The second problem is that once the transmitter is keyed, by both the
> program through the computer and the output from the Signalink and the
> trsanmission is stopped the transmitter hangs on transmit.
> Any suggestions would be appreciated.