Valve MF pantry transmitter.
I got bored... And built a MF pantry transmitter using an ECL80.
The triode is an xtal oscillator which feeds the output stage which is screen modulated using a backwards connected transistor radio 'LT44' driver transformer to connect to the high impedance headphones output of the ancient Nokia phone I use for streaming. Feeding audio to my Roberts R707 it sounds rather good. Currently listening to a bunch of Dusty Springfield tracks through ithough.... The R707 has some serious punch and really handles Dusty's wide open vocal style well. Play loud and forget about the neighbours!! |
Re: Valve MF pantry transmitter.
Sounds good, any chance of posting the schematic?
Peter |
Re: Valve MF pantry transmitter.
Quote:
It really does seem to work well, it's great to be hearing Dusty's wonderfullyfully full-on vocals resonating round the summerhouse. [Historic sidenote: I'm using a 1.333MHz carrier crystal that first did duty as the clock-oscillator in a 1970s |D|I|G|I|T|A|L| PDP8E.] |
Re: Valve MF pantry transmitter.
The usual caution applies: you should watch the range, depending on your domestic circumstances. Even a weedy ECL80 can chuck out quite a bit of power with a half decent aerial.
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Re: Valve MF pantry transmitter.
Thanks Paul, noted. I certainly do not want to go outside the boundary of the house.
Peter |
Re: Valve MF pantry transmitter.
For reference, the 'output' part if my ECL80 panty-transmiter consumes 10mA at 220V.
It's not in in any way coupled to any of my 1.8/3.5/5.5MHz "cloudwarmer "NVIS ham-radio antennas. Though part of me wonders just if there's anys sort of "DXCC" certrificate for MW pantry-transmitters or their Band-II FM equivalents. |
Re: Valve MF pantry transmitter.
Reception report from OFCOM? ;D
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