[HBR] Product Detector

[DW Holtman]

Dan,

Thank you for taking the time to send me all of the very good 
information and ideas. The hang AGC circuit in the 67./68 handbook is 
something that I will take a close look at. I'm going to look on Ebay 
today and see if someone is selling the 67/68 handbook. Also check the 
local librarys, they carry several old handbooks, not sure about the 67/68.

I'm looked at Captain Lee  product detector, bought a Jan Skirrow, don't 
think much of it. What I think is really cool is the military converters 
such as the CV-591. I looked at the schematic for it and want to build 
something similar to it.

I'm looking for a 19 inch rack mount cabinet. I plan to mount My R-390A, 
R-392 etc in a rack. I would like to build a period Product Detector. I 
know that with time, I could find a military one on Ebay,  but would 
rather build one myself, now that I  have the time. I have enjoyed home 
brewing for quite a while.

Thanks Again,
73's
DW Holtman
WB7SSN


Dan Merz wrote:

>Hi again,  I looked thru my pile of 390a mod's,  past articles,  etc and
>found no tubed external PD projects, or circuits for the agc in an external
>unit.  I did find Lee's original article on the internal PD mod using the
>bfo socket for a 6BE6 PD but you are probably familiar with that.  If you
>use the HBR circuitry,  you might want to consider a version of agc used in
>the 67/68 17th edition Radio Handbook Deluxe HBR Receiver,  which is more
>elaborate than the "standard" HBR circuit.  I have no experience with it so
>can't vouch for it... Just a thought.  It's a hang circuit designed for
>ssb/cw with fast attack and selectable release,  uses 3-triode 6BC7 and
>12au7,  best regards,  Dan.   
>
>-----Original Message-----
>From: hbr-bounces at mailman.qth.net [mailto:hbr-bounces at mailman.qth.net] On
>Behalf Of DW Holtman
>Sent: Saturday, January 21, 2006 8:36 PM
>To: hbr at mailman.qth.net
>Subject: [HBR] Product Detector
>
>Hello,
>
>I have a question that I hope that someone can help me with.  I'm looking to
>build a Product Detector for a R-390A receiver. The R-390A has a BNC
>connector on the back with the If of 455 KHZ coming out. What I want to do
>is build a quality detector in a chassis that will mount in a standard 19
>inch rack. The mechanics I can handle. What I'm looking for specifically is
>
>1.  Tube gear.
>2. Built in AGC circuit, with at least 2 time constants, ie; fast and slow
>as well as MGC using manual RF attenuation (pot).
>3. At least 2 maybe as much as 4 If stages for better selectivity.
>4. Don't know yet is it is better to use cans or crystal/mechanical filters.
>5. Don't need a high power audio amp, will feed audio back onto the R-390A
>and use the onboard audio amp.
>
>What I'm looking for is a construction project from an old ARRL handbook or
>QST article for a quality receiver. I will only use the If strip and the
>detector and low power audio amp. If anyone has any suggestions on what year
>handbook/'QST might have something promising, please let me know.
>
>Thank you in advance for any information.
>
>73's
>DW Holtman
>WB7SSN
>
>
>
>
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and
>construction notes...... via http://www.qsl.net/k5bcq/ there is also a
>mirror (faster response)at http://k5bcq.edebris.com/
> 
>
>Retrieve reflector archived data via
>http://mailman.qth.net/mailman/listinfo/hbr
>
>
>
>
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>construction notes...... via http://www.qsl.net/k5bcq/ 
>there is also a mirror (faster response)at http://k5bcq.edebris.com/
> 
>
>Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr
>
>
>
>  
>