[Milsurplus] Harvey Wells AR-5A Military Aircraft

[D C Macdonald]

It is likely that control towers did not  TRANSMIT  on LF/VLF,
but it is also likely that a receiver used in the tower might
easily be used to periodically monitor a nearby LF station
that transmitted weather information for a wide area, or
simply to check to see if the local non-directional beacon
or Adcock range were still transmitting.

LF stations broadcasting wide-area weather reports used
to exist; there was one here in Oklahoma City and they
provided weather info to aircrew, both for flight planning
and for in-flight updates.

I don't know if these are still in operation.

Mac, K2GKK/5




----Original Message Follows----
From: WA5CAB at cs.com
To: millenniumfalcon at cableone.net
CC: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Harvey Wells AR-5A Military Aircraft
Date: Thu, 21 Oct 2004 21:56:40 EDT

I don't have any info on the receiver (that I know of) but the answer to 
your
other question is no, airfield control towers never used VLF, which is
anything below 30 KC.  They could (and did) transmit voice at MF (300-3,000 
KC) and
in the upper portion of the LF band (30-300 KC) through their ND beacons.  
And
received and transmitted at HF (3,000-30,000 KC).  I've forgotten the exact
reason for this although I can think of several plausible ones.

In a message dated 10/21/2004 7:43:55 PM Central Daylight Time,
millenniumfalcon at cableone.net writes:
 > I recently got a Harvey Wells AR-5A military aircraft radio.  It has two
 > bands, 200 to 400 Kcps and 550 to 1650 Kcps both AM detection.
 >
 > There is a switch on the front with a position for Tower and one for
 > Range and others.  I know that the Range was in the VLF frequency band,
 > but did the tower in the late 40s and early 50s use VLF??
 >
 > This set is extremely clean and is complete with an attached AC power
 > supply.  I have not yet tried it out but am thinking of using it for the
 > final IF of an AM converter (yet to be built) for 80-40-20-10 where the
 > output of the converter will be 200 Kcps chunks of the various ham bands.
 >

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)
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