Ken's comments about "single signal" performance with the RAL reminded me of an article that explained how very precise control of regeneration can create that effect.  IIRC, the theory goes that one sideband was just barely in the oscillating mode (maximum selectivity) and the other sideband was not in oscillation, attenuating it.  Regeneration control is frequency sensitive, maybe this is an optimization of that ? .  I'll dig up the article and reference it to you all.

Does this make any sense ?

Alan, N3BJ

On Sun, Oct 22, 2023 at 12:43 AM <milsurplus-request@mailman.qth.net> wrote:
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Today's Topics:

   1. Re: [MMRCG] Refurbed (?) U.S. Navy RAS Receiver (Konrad Werzner)
   2. RAL Receiver (David Stinson)
   3. Re: RAK-RAL - the use of... (Kenneth G. Gordon)


----------------------------------------------------------------------

Message: 1
Date: Sat, 21 Oct 2023 16:35:58 -0500
From: Konrad Werzner <usstexasradio@gmail.com>
To: Jim Whartenby <old_radio@aol.com>
Cc: "milsurplus@mailman" <milsurplus@mailman.qth.net>
Subject: Re: [Milsurplus] [MMRCG] Refurbed (?) U.S. Navy RAS Receiver
Message-ID:
        <CA++10jSz1211eka-g6g9Ob5J93vtUbCnoT-G9FupqyiEHUh7ng@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Digging through the DTIC database, I found one of the benchmarking
documents for the RAS. It's labeled "XRAS" since it was still experimental
at the time and appears to fail in a lot of Navy benchmarking requirements.
It's interesting to note that this is what caused the eventually approved
RAS to use of the 6V6G and 6F8G tubes compared to other HROs. Enjoy
reading:

https://apps.dtic.mil/sti/trecms/pdf/AD1158726.pdf

On Mon, Oct 16, 2023 at 4:47?PM Jim Whartenby via Milsurplus <
milsurplus@mailman.qth.net> wrote:

> I believe coaxial cable was invented some 50 years earlier (1880) by
> Oliver Heaviside who also held the original patent.  His biography is worth
> a look, talk about being ahead of your time!
> Jim
>
> Logic: Method used to arrive at the wrong conclusion, with confidence.
> Murphy
>
>
> On Monday, October 16, 2023 at 03:38:17 PM CDT, howard holden <
> holden7471@msn.com> wrote:
>
>
> Very specifically, submarines used coax cables. Don?t recall other ships
> using, but I can?t imagine why not. Coax was invented in 1929 I think.
>
>
>
> Howie WB2AWQ
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows
>
>
>
> *From: *Hubert Miller <Kargo_cult@msn.com>
> *Sent: *Monday, October 16, 2023 1:27 PM
> *To: *milsurplus@mailman <milsurplus@mailman.qth.net>
> *Subject: *Re: [Milsurplus] [MMRCG] Refurbed (?) U.S. Navy RAS Receiver
>
>
>
> I don't think any WWII era ship used coax for HF.
> Or, what am i missing?
> So is there a coax - single wire conversion needed?
> -Hue Miller
> ______________________________________________________________
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Message: 2
Date: Sat, 21 Oct 2023 16:57:09 -0500
From: David Stinson <arc5@ix.netcom.com>
To: "milsurplus@mailman" <milsurplus@mailman.qth.net>, MMRCG
        <MMRCG@groups.io>
Subject: [Milsurplus] RAL Receiver
Message-ID: <7f94ed70-dfde-46c9-a291-9c900c1d034e@ix.netcom.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

I'm looking for a specific RAL receiver owner.
One who is either using his RAL, or has it on
his bench and regularly works to put it in
operation.

That person's RAL is missing its case.

I do NOT want to know about those who have an
RAL in a lost corner of the barn since 1968,
down in the often-flooding basement, or
down near the bottom of the "get around to it"
pile in the garage since that hamfest 17 years ago.

I'm looking for the person who actually wants to
use his RAL and is actually taking steps to accomplish it.

TNX OM DE Dave AB5S

--
This email has been checked for viruses by Avast antivirus software.
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------------------------------

Message: 3
Date: Sat, 21 Oct 2023 21:42:57 -0700
From: "Kenneth G. Gordon" <kgordon2006@frontier.com>
To: Milsurplus <milsurplus@mailman.qth.net>
Subject: Re: [Milsurplus] RAK-RAL - the use of...
Message-ID: <6534A851.25581.3162C63B@kgordon2006.frontier.com>
Content-Type: text/plain; charset="us-ascii"

I have made somewhat extensive use of both the RAL and the RAK receivers and would like
to share some of my experiences with both.

Both of my receivers were being operated from the original power supplies, which are really
too big and too power hungry for ham radio use. They aren't needed where you don't have
big turrets being swung around drawing the line voltage down each time.

In a normal ham station, a very simple supply, providing 180 VDC at a few miliamps is
usually all that is required. A regulated 90 VDC is nice, but not absolutely necessary.

In fact, according to the manuals on these receivers, they work just fine with ONLY the 90
VDC source.

Anyway, with regard to the RAK, I used mine to copy 5 letter code grounps from the U.S.
Navy VLF stations while they were still using CW, and before they switched to RATT. I was
intending to work my way up to 30 wpm of steady error-free copy as I wanted to go to sea to
be a ship-board radio operator.

I eventually got my 2nd Class Radio Telegraph license toward that end, but many things
intervened and I never was able to complete that project.

The Navy station at Jim Creek in Washington state always came in to my station in Missoula,
Montana like gang-busters 24/7/365. I think I could have used a wet-string as an antenna.

The first thing I noticed about my RAK was its amazing stability. It was rock steady. Once
tuned to a signal, it remained there. One could literally hammer on the radio with a hammer
and it never moved frequency.

The second, most amazing thing, to find was its "single-signal" selectivity. The "other side" of
zero beat simply wasn't there....at all. Not even a hint of it.

I am still somewhat in the dark as to how this was done. I believe it was due to the "Q" of the
tuned circuits in the radio. I understand that that value was around 1500, which is very
unusual for such coils.

Maybe someone here can enlighten me how this was done.

With regard to my RAL, I traded a BC-348 with BC band ARC-5 "Q-5er" for it while I was a
new General (actualy Conditional) class ham so that I could work 15 meters.

I used my RAL for some 12 years as my only station receiver, and never turned it off.

My ONLY complaint with it was the total lack of a real frequency readout. Using the tuning
chart in the manual was difficult, but I got used to it.

Again, like the RAK, it was unconditionally stable.

I really liked its "quietness" and sensitivity.

I used it for every common mode at the time, CW, AM, SSB, RTTY. I could have used it for
digital modes (other than CW and RTTY) if they had existed at the time.

Ken W7EKB
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