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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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11th Mar 2023, 5:49 pm | #1 |
Nonode
Join Date: Jun 2010
Location: Spalding, Peterborough, Cambridgeshire, UK.
Posts: 2,851
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Non Directional Beacon receiver used 4.4MHz IF information wanted.
Sorting through a large box of crystals today, I found a few for NDB receiver frequencies from 210KHz to 370KHz. There are can markings between 4030 KHz for 370KHz to 4190KHz for 210KHz.
All are Hc6/u This gives an IF of 4.4MHz. Bags were marked as NDB Monitor with the lf frequency of the actual channel. Any ideas what NDB rx used such an IF. Picture of the box of crystals. The lever arch files are mostly in correct order by frequency. The rest are not! Thanks, Rob
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11th Mar 2023, 9:43 pm | #2 |
Heptode
Join Date: Apr 2009
Location: Scratby, Norfolk, UK.
Posts: 648
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Re: Non Directional Beacon receiver used 4.4MHz IF information wanted.
Hi Rob,
The only clue seems to be that it would probably be a US or Canadian design as 210 kHz is not going to be used for beacons in areas with Long Wave broadcasting. Coincidentally the only thing I could find with a 4.4MHz IF was a reference to the Nautel NRB4 beacon receiver (US/Canadian Manufacture), which does cover 210 kHz but doesn't use crystals! Kind regards Dave |
12th Mar 2023, 3:45 pm | #3 |
Nonode
Join Date: Jun 2010
Location: Spalding, Peterborough, Cambridgeshire, UK.
Posts: 2,851
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Re: Non Directional Beacon receiver used 4.4MHz IF information wanted.
Thanks Dave.
No worries, just curiosity really. Won't be any use these days anyway, so will go into the clearout pile. Thanks, Rob
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Apprehension creeping like a tube train up your spine - Cymbaline. Film More soundtrack - Pink Floyd |
12th Mar 2023, 8:33 pm | #4 | ||
Heptode
Join Date: Jan 2009
Location: West Lothian, UK.
Posts: 760
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Re: Non Directional Beacon receiver used 4.4MHz IF information wanted.
Quote:
There was this message for someone else in PPrune in 2015:- Quote:
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12th Mar 2023, 11:21 pm | #5 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
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Re: Non Directional Beacon receiver used 4.4MHz IF information wanted.
Two thoughts occur: How much had that cost the taxpayer, and does that mean that users of AM pantry transmitters are reassured of insignificance!
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13th Mar 2023, 6:27 pm | #6 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,676
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Re: Non Directional Beacon receiver used 4.4MHz IF information wanted.
The anacdote is very interesting, but a bit odd.
During the 90s when A252 was in its heyday, I visited the Kingdom of Fife several times and can distinctly remember that reception was not marvelous, but I have no recollection whatsoever of any interference (other than from the co-channel Algerian station).
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