Help Regarding Transmitters....

NIHIT

hello everyone...
I am a new member of this forum
I am going to design a transmitter which can work at a frequency range of 142-147MHz.
I want some links or any circuit diagrams which any one can provide me.
Please it's urgent. If anyone helps me i'll be grateful.

Leon

That frequency band is probably illegal, unless you have an amateur radio license. Have you checked the regulations for your country?

Leon

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Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle

Toby Seckshund

I couldnt get the frequency geneterator objectto run that high, reliably and so would require multipliers. Then I suspect that the phase noise wouldnt be good on narrow band work.


@Leon how easy would it to get back a G8 after 20 years?

Leon

I wouldn't use a Propeller as a signal source in any transmitter, the phase noise would be appalling.

I helped a friend of mine retrieve his UK license after about 8 years. He lives in France and I let him use my address to make things easy.

You should contact Ofcom:

www.ofcom.org.uk/licensing/olc/

Licensing registration is down at the moment, though.

73, Leon

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Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle

Post Edited (Leon) : 5/2/2009 4:10:43 PM GMT

Phil Pilgrim (PhiPi)

Leon said...
I wouldn't use a Propeller as a signal source in any transmitter, the phase noise would be appalling.

Yup. I tried this in that same frequency range. Even with phase dithering, it was impossible to eliminate the outlying frequency spurs caused by PLL jitter. At much lower frequencies, though, the jitter is reduced; but it's still not likely to be acceptable for transmitter use.

-Phil