Just found one on eBay:
Ordered it. Will convert it to a DDS VFO.
I am sitting here with an operational set of Benton Harbor S-Line Twins!
Do I really need this kind of stuff.
The Heathkit HW-7 and HW-8 were DC receivers. But I have never owned one. I
am just curious about DC receivers.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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----- Original Message -----
From: "Bob Macklin" <macklinbob@...>
To: <
[email protected]>
Sent: Wednesday, November 06, 2019 6:25 AM
Subject: Re: [qrptech] DDS VFO!
Does anyone make a PCB for a 40M DC receiver. Maybe clone the old Ramsey
receiver?
The PCB pattern is in the published manual. But not the schematic.
Maybe I should reverse engineer the Ramsey Rx and Tx.
A Ramsey 40M DC receiver with a DDS may be interesting to try.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message -----
From: "Jim Pruitt" <jpruitt67@...>
To: <[email protected]>
Sent: Tuesday, November 05, 2019 10:31 PM
Subject: Re: [qrptech] DDS VFO!
On 11/5/2019 3:40 PM, wb6ogd wrote:
My NC-40 (homebrew copy) tunes 7014-7066. Below that they go too fast
for
me, above that is only
the digital modes and the novice band.
What is wrong with the old novice band? I frequently listen there.
NC-40 filter is too narrow for SSB (though I have listened to
some canadians and you can mostly understand them but with very bad
quality). Why would you
want more than that?
Because it is there...errr because I can.
There was some comment that a DDS vfo has a pretty low upper frequency
but
the AD985x series are good to at least 30.0mhz.
The NC40 VFO runs in the 2 mhz range and the Si5351 and the AD985x would
loaf along at those frequencies. VK5TM had some pretty good circuits on
his web pages. As I recall, he even had the PIC code. That code could be
modified to set the band range to match your rig.
My pet project is a DDS (or PLL) vfo for the HW8. My HW8-Franken vfo
would
run between 8.4 and 8.9mhz. Have you seen anyone else do that to an HW8?
My plan is to use one of the ebay 6 digit counters and measure the
frequency directly so no IF offset needed and would be undesirable anyway
since circuits do drift and it would be easier to measure the frequency
than to predict the drift!
Thank you.
Jim Pruitt
WA7DUY
