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How do I turn a 4 meter two way radio into a vhf tv transmitter?

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  • Bogomil Bunja
    Bogomil Bunja Aug 14, 2016

    Hi. Mr. Millett can I use radio shack's vhf tv modulator with my 4 meter handheld two way radio? Thank you very much.

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  • 119 Answers

Depending on the frequency you want to transmit video on, you would have to modify the synthesizer to produce RF on that frequency. That may or may not be easy. Then, you have to build a wide band modulator (DC to 6MHz) that can modulate the DC voltage to the final RF stage. If you want audio as well, you would have to build another modulator at 4.5 MHZ (or whatever your audio carrier frequency is for your TV standard) and add this to the video signal.

Check the ARRL or the RSGB HAM Handbook for more information.

Doing this modification will not be easy!

Posted on May 02, 2015

  • Andrew Taylor
    Andrew Taylor Apr 29, 2016

    message from this nutter a year on!

    Chris Millett I want to know. If I want to turn a 4 meter handheld two way radio into a vhf tv transmitter, can I use radio shack's tv modulator?

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SOURCE: my cobra 29ltd cb radio will power on and recieve

I am assuming you have called out for a radio check and not gotten a reply, or even better tested it with friends radio. Just because the meter doesn't mover doesn't mean that its not transmitting.

So as long as you tested it with another radio, and it is not transmitting it could be any number of things. If you have never had antenna tuned so the swr is low, or your swr was high for a long time, your final transistor is most likely blown.

TX switching transistor could be blown, trace could be gummed up.

If your ant light is coming on, the is a problem with your antenna. Could be disconnected, and that can lead to a blown final.

At any rate, your problem most likely requires a tech. Take it to a repair shop.


Posted on Oct 01, 2009

  • 607 Answers

SOURCE: I have an Icom v-8000 radio.The TX is very good with 75 watts out-put. But have nothing in RX.No signal and no audio.

Hi,
What you have is an amateur band radio, which requires you to be a licensed operator to use it. It is possible that the frequencies have been removed from the eeprom prior to your purchasing same.
You can have Rx only frequencies programmed by an authorised 2-way workshop, but until you become a qualified amateur operator, you will not be able to get Tx frequencies programmed.

For licensing info for Amateur operators visit www.vk6wia.org.

Regards,
Peter

Posted on Mar 04, 2013

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Chris Millett I want to know. If I want to turn a 4 meter handheld two way radio into a vhf tv transmitter, can I use radio shack's tv modulator?


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Set up the transmitter. Wireless headphones rely on a transmitter that sends audio via infrared or radio waves to your headset. Use the digital audio output (coaxial or optical), RCA outputs (red and white) or headphone jack on your TV to connect the transmitter. The connection will depend upon which outputs are available on your TV and/or the transmitter.
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