[NJARC] NJARC Digest, Vol 112, Issue 8

[Pete Malvasi]

Hi Rich - yes those beacons are still active and some of them even plague 160 Meters with harmonics at times. But transmitting VHF and listening LF I never heard of. 

Mike / I have the manual but its poorly written and implies this mode of operation. The transmitter is crystal controlled but the receivers use variable tuning. Seller is sending me other parts of the manual and schematic so will see. 

Sent from my iPhone

On Aug 18, 2013, at 2:55 PM, rckchp at comcast.net wrote:

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> Pete, 
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> 120mhz is in the airband freqs. ( http://en.wikipedia.org/wiki/Airband  ) In 50s the am broadcast band and the LF 200-500khz band were used as "homing beacons", an earlier type of direction finding. When installed in an aircraft your radio probably was connected to a instrument panel mounted round gauge which would indicate the heading (in compass degrees) to the ground transmitting station. The LF beacons transmitted an audio cw identifier, such as EWR for Newark airport.....which is why the commercial pilot test included knowledge of international code in those days....maybe still does. 
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> Rich  K2CPE 
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>    1. Early aircraft radio (Pete Malvasi) 
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> Message: 1 
> Date: Sun, 18 Aug 2013 11:01:06 -0400 
> From: Pete Malvasi <pmalvasi at aol.com> 
> To: NJ ARC Mail list <njarc at mailman.qth.net> 
> Subject: [NJARC] Early aircraft radio 
> Message-ID: <95D76B55-815B-425A-8946-66D9D011BD3B at aol.com> 
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> I recently bought a bendix airplane transmitter ca 1950 and noticed its both a transmitter and receiver. It transmits on the 120mhz am band but receives both BC band and 200-500khz. 
> 
> Does anyone know about this - the dual band t and r aspect of aircraft radio then? This is new to me. 
> 
> 73 Pete W2PM 
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> Sent from my iPhone 
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> End of NJARC Digest, Vol 112, Issue 8 
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