Inexpensive SWL recievers

[Bill Coleman AA4LR]

On 11/10/98 6:31 PM, Gary L. Sanders at gsanders at RICOCHET.NET wrote:

>I think that we have all become a little hazy about these SWL receivers,
>I am positive that the GR-64 was the inexpensive 4-tube unit that did
>regenerate with the BFO control;

Well, the BFO control did cause the IF tube (6BA6?) to oscillate, and
hence, create a beat frequency. It was pretty touchy and not very good
for SSB/CW receiption. It would be a mistake to consider this a
"regenerative" receiver. It is clearly a superhet.

>...and the GR-54 was the 6-tube unit with
>the TRF stage. I had the cheaper GR-64 first, then sold it and bought
>the more expensive GR-54. In spite of the fact that 64 is a bigger
>number than 54, the 54 was the best unit, and bigger.

I still own my GR-81 (and I'm looking for parts) that I got for Christmas
1970. My older brother receive a GR-64 at the same time. Boy, did he ever
spend a lot of time on that radio!

Eventually, the GR-64 got sold to me, and I modified it to receive
ham-bands only just before I bought an HR-10B kit. I later used parts
from the GR-81 to restore the modifications of the GR-64 and sold it to a
friend.

At one point, I could just about trace out the schematic of the GR-64
from memory.



Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at radio.org
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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