[ARC5] FYI - Noise meters

[J. Forster]

You might consider the TestEquipTrader Yahoo Group. There are a lot of RF
guys there.

There are also a bunch of other RF and Tek and HP groups. If you'd like me
to post there for you, drop me a note off-list.

Best,

-John

===============




> I have several models of the Stoddart "Noise Meters" with their shielded
> loops here. There are three loops for each receiver: one is 1 inch in
> diameter, a second one is 6 inches in diameter and the third one is 3 feet
> in
> diameter.
>
> They use twin-ax to connect to the "Noise Meter"s.
>
> I also have large, wooden tripods on which to mount the loops, and
> carrying
> cases for all the accessories.
>
> These so-called "Noise Meters" are in actuality extremely high quality
> receivers which include very accurately calibrated signal strength meters.
>
> Every manual I have for each version of these receivers explains in
> excruciating detail how to measure field strength, field patterns, and
> ERP.
>
> The receivers I own cover from 30 Hz through 10,000 MHz, which is
> practically from DC to daylight.
>
> I am missing the model that covers down to 3 Hz (!) and the one that
> covers
> from 10 KMHz to 30KMHz. (Drat!)
>
> All of these receivers are tube-based.
>
> The one I particularly like is the NM-20(*) which covers 150 KHz through
> 25
> MHz, and includes a tunable BFO and variable selectivity. The tubes in it
> are
> all battery-types, and it has provision for internal batteries, although
> it also
> has an external AC supply in which all voltages are regulated.
>
> I have quite a number of the AN/URM-6, which is the Navy version of the
> Stoddart NM-10 model Noise Meter. It covers from 14 through 250 KHz. I
> have at least two complete sets, and several receivers which do not
> include
> the accessories.
>
> I am not quite sure what to do with them, but they are far to beautifully
> made
> to either throw away or to cannibalize.
>
> Nonetheless, I will probably do one or the other with at least some of
> them.
>
> I have a very bad case of TMJ (Too Much Junque) here... :-(
>
> Ken W7EKB
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