Some observations:
It appears the 2NT is using harmonics of the fundamental for 20m,
15m, and 10m. With a VFO, I expect it would have to be designed
to provide these harmonics or the actual fundamental frequencies.
For harmonics, they would have to be of the appropriate amplitude,
and I imagine
Bill, page 9 of the 2NT Manual says
80m crystal 3.5MHz to 3.8MHz Output Freq 3.5MHz to 3.8MHz
40m crystal 7.0MHZ to 7.2MHzOutput Freq 7.0MHz to 7.2MHz
20m crystal 7.0MHZ to 7.125MHzOutput Freq 14.0 to 14.25Mhz
15m crystal 7.0MHZ to 7.083MHzOutput Freq 21.0 to 21.25M
Bill -- there is an addendum page for the 2NT manual that gives you
the frequency ranges and drive levels required; I'm sending that to
you direct as I'm not sure it'll make it thru the mail list. I've
used the Norcal FCC-1/2 DDS VFO/counter to drive the 2NT. The DDS
board puts out enough
From the 2NT Manual:
80 meters Crystal X 1 3.5 - 3.8mhz
40 meters: Crystal X 1 7.0 to 7.2
20 meters: Crystal X 2 7.0 to 7.125
15 meters Crystal X 3 7.0 to 7.083
10 meters Crystal X 4 7.0 to 7.125
So, looke like 7 to 7.2 gets you everything BUT 80 meters on this radio.
Bill Ellis wrote:
Hi all
Hi Bill,
I am sure someone will come up with a manual, I don't have one.
It would appear that the VFO frequency output should be the same as the
fundamental frequency of whatever crystals are required buy the manufacturer.
The
only thing you will have to watch is the amplitude of the outp
Hi all,
If I were building a VFO for a 2NT, what would be my frequency range for the
output to plug it into the crystal socket on the front?
Thanks,
Bill, WB9CAC
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Hi, I have an older ms-4 that came with an early R4a I recently acquired.
Interestingly, it has a speaker with an alnico magnet. My newer Ms-4, that is
R4C vintage, has a ceramic magnet. Doing an A/B of the two, I think the alnico
model sounds better, which is what I would have suspected. An
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