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In addition to the RHM and AGS receivers, National also produced the RHP and RHQ receivers that were very similar to the RHM within the circuitry but ganged the three coils together behind a small panel that created a plug-in "coil set" for each tuning range covered.

These receivers were specifically designed for airways communication and therefore were only supplied with two coil sets that allowed tuning from 2500kc up to 6500kc.

Additionally, an optional Crystal Filter assembly was available on special order.

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It is all original and has its complete original coil set (15 coils) in the original rack mounted coil holder.

In March 1933, Radio News published an article by James Millen titled "Testing a Modern Superhet" that described National's procedure for testing and aligning the AGS receiver.

Plug-in coils to select the tuning ranges, a separate power supply and a micrometer-type tuning dial are foremost in the design and were to become standard features for National receivers over the next several years.

Since the RHM was a commercial airways receiver it had to be built with the best material and best parts available to assure top reliability and performance.

Each band required three coils, RF Amp, Mixer and Local Oscillator which gave the user five tuning ranges. It's likely that less than 100 RHM receivers were built and only a few survive today since most of the airport equipment was scrapped when it became obsolete.

To take advantage of the prestige the Department of Commerce contract had given them (and to profit through additional sales to the general public,) National adapted the RHM for ham use and dubbed it the AGS.

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In late-1931, National Company was selected by the Department of Commerce (who was in charge of airports and airways through the Aeronautical Branch) to build new superheterodyne receivers to replace the old regenerative receivers then being used at airports around the country.

The entire system upgrade of airport communications equipment included General Electric, who got the contract for the new transmitters and Aircraft Radio Corporation, who got the contract for the new airborne gear.

This has given me the best results, although if I don't want to use the "Baldies," I can connect up a Hi-Z magnetic cone speaker like a Radiola 100A which then eliminates the need for an audio output transformer and provides ample volume (the Hi-Z speaker solenoid coils connect between AF plate and B - just like an audio output transformer.) The RHM functions quite well with 75 year old components - every part was the best that was available at the time.

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