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Accepting offers - To complete the design and build low power AM transmitter

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Transmitter Man

Transmitter Man

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I am looking to partner up with an experienced all round RF engineer that can help me complete a design for a 12v DC powered PLL tuned low power AM transmitter for the 160m (1.8-2.0MHz) amateur band.

I already have a fairly well developed crystal controlled transmitter design and there are a whole bunch of fairly simple PLL's out there including these from Freddo's old site: **broken link removed** one of which may be suitable with modified PIC program.

I am interested in integrating an LCD for frequency display / PLL lock.

Minimum component count and clean, compact board design would be a bonus.

Payment to be agreed.

If you think you could be interested please mail me either in the forum of via pm.

Thanks and a Happy New year to everyone :)

David
London, UK
 

Hello,

My name is Mel and I am a retired communications engineer. You request is a rather simple one. May I suggest you contact N3ZI web site for a DDS kit that has a LCD display and does what you wish. I have built several of his DDS and they work wonderfully,

Regards,

Mel, K6KBE
 

Hi Mel,

His DDS looks very nice but not quite what I'm looking for that's why I'd like to work with someone on a custom design + he does not offer any transmitters.

I wonder if you are up for this task?

David G4ZOW
 

Ok, what I gave you was the canned answer. Since you did not give any specifications, it was appropriate. If you wish to proceed, please prepare a concise set of "complete" specifications you desire before we proceed.

That is, complete system electrical, spectral purity, effeciency, etc. requirements. Then, mechanical, environmental, certification and cost requirements. Of course the timeline on delivery of the first design, funding options, and production compliance requirements of the production and destination country.

Simple isn't it?


Respectfully,

MelF
 

Hello Mel,

Thank you for your reply.

A somewhat daunting task for someone who has a limited engineering background.

There are a number of areas of such a design where I am unable to provide answers, for example the overall efficiency as I do not know what is realistically achievable. This is not a design on behalf of the DOD or NASA and budget constraints are of course an important issue.

Would you prefer to take this to private mail or to initially bounce some ideas around here in the forum for all to comment?

I'm happy either way.

David G4ZOW
 

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