[ARC5] Regeneration, and the RU, among others.

[Henry Mei'l's]

Maybe I remember wrong, but I thought a DC receiver was made up of a 
combination of a TRF receiver (no IF circuits) where detection takes place 
by hetrodyning/beating a locally generated  signal against the received (non 
frequency-converted) HF signal, whereas a
"straight, classic" TRF receiver signal uses some kind of 
detection/rectifiaction device to extract/seperate the the audio from the 
(often amplified)
received RF signal. I suppose whether or not a 
regenerative/super-regenerative receiver is a special form of TRF receiver 
is a moot point.
According to the 1979 ARRL Handbook.pp 8-7, 8-8: "Direct-Conversion 
Recievers ...direct-conversion or synchrodyne type ... the detection stage 
of this receiver is actually a product detector that operates at the desired 
signal frequency."
(I thought I "invented" the DC receiver when I was a teenager -- but found 
out that I wasn't first on the idea ;0)

Henry, Cph.  OZ1UF/exK2UOC/etc.



----- Original Message ----- 
From: "Bob Macklin" <macklinbob at msn.com>
To: "Discussion of AN/ARC-5 military radio equipment." 
<arc5 at mailman.qth.net>
Sent: Friday, September 17, 2010 2:30 AM
Subject: Re: [ARC5] Regeneration, and the RU, among others.


BFO on or off, since there is no conversion to an IF it is a direct
conversion Rx.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "Kludge" <wh7hg.hi at gmail.com>
To: "'Discussion of AN/ARC-5 military radio equipment.'"
<arc5 at mailman.qth.net>
Sent: Thursday, September 16, 2010 5:02 PM
Subject: Re: [ARC5] Regeneration, and the RU, among others.


-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Kenneth G. Gordon
> I have used several U.S. military TRF receivers, mostly those for
> VLF, but my favorite, the RAL for HF. There is absolutely
> NOTHING requiring "two-handed" operation. Even the regen
> control has an auxiliary pot attached to the rear of the main tuning
> dial that automatically compensates for the change in regen
> setting across a band.

That pot on the tuning mechanism would be the "second hand".

> Also, there was an article in a recent issue of ER concerning the
> RU, which is also a TRF. The author found it to be a really
> excellent receiver. It, also, does NOT require "two handed"
> operation.

Okay, let's make this simple.  (I know some of the symbology is off; it's
been a while.)

TRF != regenerative detector.  TRF = TRF.  Regen = regen.  Regen = some form
of adjustment of regen control across tuning range - a "2nd hand", meat or
mechanical.

RAL = regen = mechanical 2nd hand with provisions for meat.

RU = TRF.  RU != regen.  !Regen = !regen control = !"second hand."

Also, RU = built-in BFO that tunes with the Rx.

And finally, for reference purposes, homemade (or just home) regen sets !=
military equipment.

> His conclusion was that the RU was, essentially, a really superb
> Direct Conversion receiver.

Odd.  The BFO is only on when in CW.  Did he actually check out the
schematic or find a manual and follow the circuit description?  In AM, the
BFO is off which means it suddenly isn't DC but a just plain old grid
detector doing what grid detectors do, that being detect.  While the end
result in CW & SSB may functionally emulate a DC receiver, it is by no means
one at all.  That's kind of like saying a command Rx has a product detector
since it acts like it does when the BFO is on.

Best regards,

Michael, WH7HG BL01xh
http://www.nationalmssociety.org/chapters/NTH/index.aspx
http://wh7hg.blogspot.com/
http://kludges-other-blog.blogspot.com
Hiki Nô!

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