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neon indicator · 21st Jul 2011, 1:17 pm

I don't remember what the 405 Band I is. But all the early Band I/III/UHF 625 tellies here can do about 42MHz to 70MHz, 170Mhz to 300MHz and 465 to 880MHz. Later models did 42MHz to 890MHz with no gaps (so as to suit cable TV). It's only a few years ago that our "local" Band I 625 Colour TX closed.

It depends on the 405 line TV. later ones have a wider tuning range. Some you have to retune the biscuit cores for an "off channel" signal.

In theory 49MHz and 54MHz are in Band I. But for a home modulator a one transistor osc with regulator between it and and battery or PSU is stable enough at that frequency even without a crystal.

21st Jul 2011, 1:17 pm	#78
neon indicator Retired Dormant Member Join Date: Jun 2010 Location: Co. Limerick, Ireland. Posts: 1,183	Re: Simple memory card player idea I don't remember what the 405 Band I is. But all the early Band I/III/UHF 625 tellies here can do about 42MHz to 70MHz, 170Mhz to 300MHz and 465 to 880MHz. Later models did 42MHz to 890MHz with no gaps (so as to suit cable TV). It's only a few years ago that our "local" Band I 625 Colour TX closed. It depends on the 405 line TV. later ones have a wider tuning range. Some you have to retune the biscuit cores for an "off channel" signal. In theory 49MHz and 54MHz are in Band I. But for a home modulator a one transistor osc with regulator between it and and battery or PSU is stable enough at that frequency even without a crystal. Last edited by Kat Manton; 21st Jul 2011 at 1:51 pm. Reason: OT stuff moved