BTW:
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The NRR group operates 40M CW in the old Novice segment. Or what's left of it. 7100:7125, 7125:7150 is Extra territory.
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SKCC also has CW activity in the 7100:7125 segment.
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Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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----- Original Message -----
Sent: Wednesday, November 06, 2019 6:11 AM
Subject: Re: [qrptech] DDS VFO!
I built my NC-40A about a year ago.? One of the nice things about the rig is its VFO. I set mine up for 7015 to 7047 kHz. A bit limited in that it doesn't cover the activity around 7112 to 7123, but still a pretty good range. I think it's about right for use
of a single-turn control with tuning not becoming too critical. A wider range with a multi-turn pot would necessitate a turns counter or AFA or similar complication.? I have a paper scale/bezel that I can read to near 1 kHz.
With that said, why add a synthesizer? "Because it's there." is one answer. It's ham radio, after all - do what seems fun. Any of those Si or AD based units ought to work fine.
I'm currently enhancing the software in my Si570 VFO. I'm adding it to a transceiver project so it needed the ability to detect key-down and do the CW shift (if in CW mode) and also incorporate stuff like RIT and USB/LSB (or Normal/Reverse) operation. It's
close to ready.
Speaking of RTTY, I have an AD9851 signal source that I've programmed a lot of feature creep into, including the ability to send a 60 WPM 170 Hz shift RTTY message repetitively. I'd already added a CW message but wanted to stay in step with the Elecraft XG3,
which can do both. So, that was a fun thing.
73-
Nick, WA5BDU
