Wednesday, December 24, 2014

The K5TRA Allstar Web Transceiver

This is a very cool project from Tom - K5TRA.

Attached are some photos of my (just completed) Christmas toy, an Allstar web transceiver.

Complete with DTMF mic, just plug-in power and network and it functions just like a radio transceiver.

Here is more construction information of this device.....

The boards are:


modified USB audio FOB,

audio PA, and one of my regulator/fan control boards.

Attached is the schematic for the regulator/fan board.

In this application, I’m only using the regulator and LED driver (no fan).

I used SMD to mod the FOB and tacked the leads to the back of the FOB board with a hot glue gun.

I  used a 1&7/8” Green-lee punch to make the speaker hole in the enclosure.

I found the speaker grill on eBay.

The enclosure is a Hammond 1454N  ($20.76 from Mouser).

The front panel LEDs are TX, RX, and HB (heartbeat).

The mic PTT line pulls the FOB COS line (SMD diode to pin48 of CM108) low to key.

Merry Christmas,
Tom - K5TRA


 All For Now
Comments Invited - 73

SmØke out.....


  1. This comment has been removed by a blog administrator.

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  3. Nice!! How did you set it up (software wise)?

  4. The software is from here:

  5. you could alos probably use this version as well:

    Basically your using a speaker and mic with a tone pad in place of a radio

  6. Theoretically If you built two of these and connected them node to node. So that no other nodes are connected to them, or can connect to them. Then you shouldn’t need a ham radio license at all, simple because there is no chance of you using the airwaves.

    Would this be any difference then using an iPad with one of its “walk-in talkie” apps that use voip??

    Trying to understand what the point is for communication purposes? I’m lost in the logic in this since their are far better and easier ways?

  7. Good Morning Unknown,

    Yes, in theory, you could connect 2 of these units back to back and use it as a "hootNhollar" orderwire between stations, and you are correct a License would not be required if that was the only use.
    it does have several practical uses, it could be used to help troubleshoot ROIP/VOIP linked radios system by using it at the site you working on, could be used between sites as an orderwire to do rf and audio alignments, actually, the uses are unlimited. but hey is it a hobby.
    You are correct it would be no different than using the PTT apps or face time or hangouts on the various platforms.
    Tom has made a very interesting device, and it has many uses.
    Thank you for stopping by.

  8. How much to have someone build me one of these things?

    1. I would say email Tom, K5TRA and ask if he has one for sale or if he would construct it for you.
      Here is his contact info: Tom - K5TRA: "tom at"
      As I cannot speak for him.

      As, I dont have a lot of extra time for a project like this right now.

      73 Sm0ke

  9. I was wondering how the PTT is realized. Instead of PTT pin 13, it pulls low pin 48.