On Aug 10, 2006, at 7:32 AM, Richard haendel wrote:
I am wondering if anyone has modified their K2 to transmit RTTY
using FSK, not AFSK. It seems that if XIT were used somehow, I
could get the 170 Hz shift by feeding the K2's pseudo"RS232"
connector from my lap top computer com port. I do not want to feed
audio into the mike connector for AFSK. It seems that there is more
RTTY distortion and difficulty in lining up the transmit carrier
with the incoming receive RTTY signal that way.
I have been using my K2/100 with AFSK RTTY using both CocoaModem and
MMTTY with no problems.
I took some time to carefully adjust the audio levels. I used a
second receiver to listen to adjacent frequencies and adjust for
minimum products. The key is to avoid putting too much audio signal
into the microphone connector -- it is really easy to overdrive most
transceivers.
I have not had difficulty lining up the receive and transmit signals.
However, if I am calling CQ, it is common for the responders to be
slightly off-frequency. I use the RIT and quickly tune them in.
My only beef with the K2/100 is the lack of a 100% duty-cycle PA.
With the stock K2/100, you can only run about 25-30 watts out in a
contest. I've added an external fan for cooling, and have
successfully run 50 watts out for long periods. (You can use the full
100 watts, but only briefly, as the amplifier heat sink will heat up
very rapidly)
Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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