121.5 is the universal emergency freq. (often called "Guard") and this likely indicated the tower would be able to communicate 2-way on it (some were receive-only).
275 & 293.8 are LF in the range of NDB's and Radio Range. Not sure what they would specifically represent in this case as the LF Range beacons are marked separately (like the NUN Range)
141.2 & 142.74 are not part of the current air-ground spectrum for voice comms, but they may have been something designated for mil use.
126.18 & 132.2 are possibly the tower freqs (or some local traffic position) -current usage tends to put towers in the range of 118 to 120.9 and ground from 116.1 to 121.9 and the 122.0-126.9 are mostly used for traffic advisories and/or FSS. 128.0-135.95 are now normally assigned to TRACONS or centers
No ATIS - that's more-or-less mid-70's tech.
How did GCA and DF work for approach? Where was the DF signal located? What is it? (I assume not ADF as PNS is clearly marked).
For reference I found this site about military radio sets from the WWII era and their frequencies 126.18 and 142.74 being among them.
http://www.qth.net/pipermail/arc5/2011-November/009252.html
I found this site
http://www.qth.net/pipermail/arc5/20...er/009252.html listing military frequencies of WWII era military radio sets 126.18 and 142.74 being among them
DF in this case is not an aircraft system. It might have been on the tower freq. or a different discrete freq. if use was of significant number. Homing assistance is provided by the ATC unit via a receiver in the tower/radio shack with an adjustable antenna getting bearings on an aircraft's transmissions and giving suggested headings. The entry in the data indicated the service was available from this unit. The use of DF Homing came in before WWII and continued in remote locations in (mostly) arctic N. America until the1990's. It could develop into a long, separate discussion but basically, as technology improved, so did the accuracy (by the 80's the 'standard' for an overhead homing was about +/- 1/2 mile but good operators could cut that to +/- 1/8 nm)/ The idea was to get the pilot within sighting distance in bad weather and in some cases orient them with the runway.
Actually the radio beacons (eg. NUN and PNS etc.) are not NDB's but Radio Range transmitters. That's another long, separate discussion but was one of the first semi-precision approach and nav aids. Directional antennae created four "legs" as shown on the chart - what looks like ILS 'arrows'.
For GCA, see the thread :
http://www.sim-outhouse.com/sohforum...GCA-for-C-47V3
An Auxilliary station like Saufley would likely have low-med runway lighting, possibly taxiway lights (probably same specs as today.) No VASI/PAPI (1970's and later) and no ILS - see the GCA discussion. There is probably a legend/key to the frequency assignments from that period - I'll do some digging.
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