[Elecraft] How to outfit a K3 for JT65HF or JT9

[Jim Brown]

On 4/21/2014 12:49 PM, David Cole wrote:
> Are you in DATA mode when you use JT65.  What mode for PSK?

RTFM. :) If you're using a computer to generate the signal, use DATA A 
for everything but RTTY. For RTTY from the computer use AFSK.

"DATA A" means that the computer generates the data modulation to be 
transmitted as an SSB signal. Use PSK if you want the K3 to encode the 
PSK, use FSK D if you want the K3 to generate RTTY modulation.

Note that while you COULD set the K3 for USB or LSB and feed to/from the 
computer, DATA A and AFSK A are far better, both because they disable 
CMP, because they disable TXEQ, replacing it witha high pass filter that 
reduces hum picked up by the unshielded input transformers. When using 
AFSK, be sure the tone frequencies and baud rate in your computer 
program (MMTTY, etc.) are the same as in the K3.

One of the things you will appreciate about using the K3 for digital 
modes is that they all center RX and TX in the passband of your filters, 
sothat if you want to narrow the IF to minimize QRM,you can simply dial 
down the RX bandwidth. In other words, the dial readout is your TX 
frequency (Mark in RTTY). Current wisdom is that 400 Hz is a good choice 
for RTTY.

73, Jim K9YC