On Fri, 12 Aug 2005 11:58:20 -0500, Cecil Moore
wrote:

Ham op wrote:
Cecil Moore wrote:
Real hams do DSP filtering at IF.

Cecil, I thought you and I did our 'DSP Filtering' by adjusting the
regeneration control or the whisker.

Strangely enough, I never used anything except a superhet.

What's an IF ??

455 Khz on everything I used back then. With no RF amp,
my S38 would receive the same signal on two different
frequencies on 15m, sometimes eliminating an interferring
signal in the process.

Cecil, without the RF amp to erase the image, the S38 could boast
two-fer-one, or double yer pleasure--two places to get yer
information--you could take yer pick. The filter in that unit was a
Gilette double-edged type.

Walt

Walter Maxwell wrote:
Cecil, without the RF amp to erase the image, the S38 could boast
two-fer-one, or double yer pleasure--two places to get yer
information--you could take yer pick. The filter in that unit was a
Gilette double-edged type.

Actually, I wanted to build the amplitude discriminator filter
described in the April 195? edition of QST. With back to back
discriminators, it blocked the strong signals and let the weak
ones through. Larson E. Rapp certainly performed miracles with
unusual electronic designs back in those days.

One time the BFO oscillator cap failed in my Hallicrafters S53A.
Shorty (W5 Old Lonely Virgin) the local TV repairman, didn't
have anything that small so he showed me how to twist two wires
together until I got the right beat frequency.
--
73, Cecil, http://www.qsl.net/w5dxp

----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----

The filter in that unit was a
Gilette double-edged type.

I remember one that could slice a QSO right in half,
with just a knock of the leg against the table.
Once kicked, I'd usually never find them again.
Not the most mechanically stable thing I ever saw, but
that was in jr.hi, and we used what we had...
Luckily, it was not my radio. :/ My first novice rcvr was
a hammarlund HQ-110...Not quite as kickable.
He later got a SX-40? that was half decent...You couldn't
kick a guy off freq with it.. :/ I've got an old national here
that looks about like a S-38...Someone gave it to me
years ago, and to this day, I've never tried to use it, or
plug it in... :/ I think it's cuz it reminds me of that S-38...
MK