Re: AGC circuit to try?

Nikos SV1IYF
 

Thanks Lawrence for the memories,

Your scan rung a long dormant bell (nostalgia face here). 
Do they come from the ARRL SSB handbook, where you scanned it from, or an original QST article sometime along 1965-1975?
Can't readily tell, but the pleasure doesn't change.

73 Nikos SV1IYF


HiOn 13/4/2018 11:41 μμ, Lawrence Galea wrote:

Ge evening Allison.
I mentioned it because of the two fets used in cascade at the front end and the use of agc.
It's design being nearly 50 years old is a totally different concept.
As you said the semiconductors are obsolete but one could use modern ones if they want to do so.
However, I have scanned the article which is hereto attached.
I scanned it at 600 dpi so I had to split it into three PDF files because of the 20 Mb attachment limit. 
Regards to all.
Lawrence

On Thu, Apr 12, 2018 at 2:48 PM, ajparent1 <kb1gmx@...> wrote:
ARRL Single Sideband for the Radio Amateur 1970 p193 et seq.
"An Engineer's Ham-Band Receiver"

I've duplicated the PLL for another radio and copied ideas for radios I have built.
They worked very well.

Three reasons its not a fit for uBITx......
One: the MOSFets used disappeared in the late 70s.
Two: Its a narrow band front end using varicap tuning, usually called a preselector. Lots of band coils.
Three: is it would require much switching to take it out of the transmit path.

Allison


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