Bill,
You could begin by breaking the problem in half - test at the output of
the optoisolators.
Front Half - Test what's coming from N1MM and MMTTY:
Put a scope or meter on the PTT line and click [TX] in MMTTY. Does the
line go low and stay low for the duration of TX?Put a scope or meter on
the FSK line and click [TX] in MMTTY. Does the line toggle at 15ms RTTY
intervals? With a meter the voltage would drop, indicating lower average
voltage - but something would be different between RX and TX.
>If this doesn't work, first place to check is the MMTTY >Options >Setup
>TX, "PTT and FSK" and >MISC, "Tx Port"
Back Half - Test whether the K3 is sending RTTY:
Use a clip lead to short the optoisolator PTT output to ground. Does the
K3 go to TX?While the K3 is still in TX, use a second clip lead to short
the optoisolator FSK output to ground. Does the TX monitor tone shift?
-larry (K8UT)
------ Original Message ------
From: "[email protected]" <[email protected]>
To: [email protected]
Sent: 2020-05-24 1:12:45 AM
Subject: [Elecraft] RTTY Problems on K3
I am fairly new to the K3 but have no problems setting up N1MM and other
software, getting things to work properly. My problem is I cannot get RTTY to
send/TX. I have made a homebrew interface with optoisolators for both the FSK
line and the PTT line. I'm going from a separate serial port, pins 3 and 7,
for FSK and PTT, to the Assy(15 pin) connector. To pins 1 for FSK, 4 for PTT
and 5 for ground.
When I run MMTTY I cannot get the rig to key. If I switch to SSB or CW and use
the CAT line to work the PTT, no problem. If I switch to RTTY and try to use
the CAT line it will not key the TX. I've tried a variety of setting in MMTTY
and get no TX. I have a 1000MP set up with a similar homebrew interface and
have no issues.
Can anyone shed some help on me?
73 Bill K3SV
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