[ARC5] [Milsurplus] Radio on the Frontlines: WWI and WWII | DPLA

[Scott Robinson]

Hi Hubert,

You're correct that these are wideband receivers. But if you detune an 
FM tuner by 20 KHz you'll probably hear objectionable distortion, since 
the detector bandwidths (a bit over150 KHZ) are not much wider than the 
+/-75 KHz modulation. I have FM tuners and radios -not particularly 
expensive ones--that turn on from cold right on the station and stay 
there. NTC cpacitors were used carefully to offset warm-up resonant 
frequency changes in the local oscillators.

I haven't thought much about TV set warm-up drift.

Peace,

Scott Robinson

On 3/9/20 6:50 PM, Hubert Miller wrote:
> Well, those are all wideband modulation, wouldn't you say ? And what's the narrowband selectivity of an FM broadcast
> receiver or analog TV like ? If one of those drifts 10 or 20 kHz, no big deal.
> -Hue
>
>> Er, what about vacuum tube FM tuners (88-108 MHz) and TV sets (56-216	
> MHZ) and UHF TV (2?? to about 800 MHz)?
>
> Plus of course 2M ham gear...
>
> Tubes are more capable that you might think.
>
> /scott robinson
>
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