Transmitter stations in 1935 - UK Vintage Radio Repair and Restoration Discussion Forum

crackle · 12th Sep 2018, 9:36 am

I thought this may be of interest to some, I came across it in the user manual for a KB 426 radio.

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Name: 1935 transmitters1.jpg
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Click image for larger version

Name: 1935 transmitters2.jpg
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ID: 169159

Added a PDF of the page below;
Mike

Scott37 · 15th Sep 2018, 10:58 pm

Interesting, but why are the wavelengths expressed in decimals? I thought wavelength was the main description in the old days. Or maybe that was just a British convention? When we used wavelengths (eg 247m, 330m etc) were these exact or approximations for frequencies?

'LIVEWIRE?' · 16th Sep 2018, 9:28 am

They were approximate equivalents to the actual frequencies, e.g., using pre-1978 allocations, 1214kHz = 247 Metres, but using the calculation 300000/Wavelength 247 = 1214.57kHZ.

Scott37 · 18th Sep 2018, 5:49 pm

Thanks. I didn't appreciate frequency was the 'official' measure in these days. Still, it seems unnecessary to include a decimal point when the dial on the set was nowhere near as accurate.

15th Sep 2018, 10:58 pm	#2
Scott37 Tetrode Join Date: Aug 2018 Location: Glasgow, Scotland, UK. Posts: 55	Re: Transmitter stations in 1935 Interesting, but why are the wavelengths expressed in decimals? I thought wavelength was the main description in the old days. Or maybe that was just a British convention? When we used wavelengths (eg 247m, 330m etc) were these exact or approximations for frequencies?

16th Sep 2018, 9:28 am	#3
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Transmitter stations in 1935 They were approximate equivalents to the actual frequencies, e.g., using pre-1978 allocations, 1214kHz = 247 Metres, but using the calculation 300000/Wavelength 247 = 1214.57kHZ.

18th Sep 2018, 5:49 pm	#4
Scott37 Tetrode Join Date: Aug 2018 Location: Glasgow, Scotland, UK. Posts: 55	Re: Transmitter stations in 1935 Thanks. I didn't appreciate frequency was the 'official' measure in these days. Still, it seems unnecessary to include a decimal point when the dial on the set was nowhere near as accurate.