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signal generator

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ryanpape

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I'm wanting to get a signal generator that can generate an 800mhz output to be attached to an antenna of a radio configured to decode digital audio on a conventional channel.

The source will be discriminator output of a scanner and ultimately a computer.

Has anyone done this? Any suggestions on what exactly is needed would be grealty appreciated.

I apologize if this is not the correct forum for this type of question.
 

Microwavemike

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Sig gen

Ahhhh....WHAT? Ok It looks like you want to use the signal source as a Local ocsillator that then would feed a mixer that would then up-convert the Lo and the IF of your scanner to a 800 Mhz channel. Good idea. You will also need a way to filter the LO out of the product of the mixer.

Most scanners have a IF of 10.5 Mhz. You would then ...say use 800 Mhz from your signal generator to produce a product of 810.5 Mhz. That product then will have both the 810.5 signal and 800.0 and 10.5 in it. You will need to have a filter that wpould only pass the 810.5 signal. That you will then feed to your radio antenna port. It would be a good idea to also reduce that mixer product with a 20DB pad. Most radios will recieve signals well below -100 DB or about 2 microvolts of RF.

Nice project. Pick up the signal generator on E-bay. A HP 8656A would be a good one... should cost no more than $ 450.00. In fact the mixers are also found there as well as the pads. The filter you are going tohave to build.

Good luck

mm
 

Microwavemike

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I have never heard of anyone attaching a sig gen to a antenna. However the HP 8656A does have a protection circuit to prevent Rf from going INTO the generator.

mm
 
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N_Jay

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Microwavemike said:
I have never heard of anyone attaching a sig gen to a antenna. However the HP 8656A does have a protection circuit to prevent Rf from going INTO the generator.

mm

A little knowledge is a dangerous thing!
 
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