[RFI] Stoddart equipment available

[Cortland Richmond]

Ah, the old avionics! I remember those when I was sent to the first Army Avionics at the Saigon Avionics base 1965). Until this year, when a family member put me away to save me of poisoned well water (GOOD thing) I don't have most of my books and old things or Ham Radio equipment, BUT I've a 1965 BW (mailto:B at W) picture I took of my Tan Son airport avionics bench with a navigation ARN-59 and I'll try to put it here.

Cortland



-----Original Message-----
From: Dale <svetanoff at earthlink.net></svetanoff at earthlink.net>
Sent: Jul 24, 2023 11:05 PM
To: Kenneth G. Gordon <kgordon2006 at frontier.com>, <rfi at contesting.com></rfi at contesting.com></kgordon2006 at frontier.com>
Subject: Re: [RFI] Stoddart equipment available

Ken,

I remember some of those Stoddard receivers, and I even have 2 of them (I don't recall the models). I know that one of them I have covers to 1000 MHz. You are correct about the quality of the build and appearance of the equipment.

The two "bricks" that I have are both tube type, including the use of acorn types in the UHF model. If I recall, yours are also tube sets. Yes, these gems are not exactly portable by today's standards, but they do work and not only can they serve as "regular" receivers (if they have a BFO), but they can actually help you track down noise sources in or around your house.

I would hope that there are some dedicated boat anchor fans on this reflector who could appreciate this sets. You might want to list them on QRZ.com and QTH.com. I think there are some dedicated test equipment forums, as well.

73, Dale
WA9ENA
Retired EMC engineer (formerly with Lindgren RF Enclosures many moons ago)


-----Original Message-----
From: Kenneth G. Gordon
Sent: Jul 24, 2023 5:19 PM
To:
Subject: [RFI] Stoddart equipment available

Gents:

I have a large collection of older Stoddart Aircraft Radio Co., Radio Interference/Freqnency
Intensity measurement equipment which has been in dry storage for several years. I got it
from a previous employer. This equipment is actually very highly engineered radio receivers
with added accessories to enable accurate measurement of signal strength, direction to, and
frequency of an interfereing station. The frequency range covered by the series of equipment
covers a low of 30 Hz, to above 10,000 MHz.

This stuff is the most beautifully built equipment I have seen in a long time. It is simply
georgeous.

I have some complete sets of various "Noise Meters" such as AN/URM-6 series (14 to 250
kHz), NM-20 (some "high" VLF through 25 MHz) receivers, NM-50, NM-30, TS-587/U, very
heavy duty tripods, stainless steel loops, both 6" diameter and 3 foot diameter loops, power
supplies, cables, etc.

I have built bias-battery sets for one, for an NM-20 and have used it very successfully to track
RFI. The NM-20 has a BFO and variable selectivity so it can be used as a normal receiver.

With the help of two of our sons, I have recently completed an inventory of the equipment,
with photos.

I would like to sell as much of this gear as possible. The main trouble is that very few people
recognize the equipment, for what it is, nor its purpose. Those who have tried to sell this type
of gear on eBay seldom find buyers who are familiar with it.

I am thinking that there must be some sort of forum dedicated to such gear. but have so far
found none.

Any help out there?

Ken W7EKB

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