Tue Aug 6, 2019, 06:38 AM


Somehow wound up with a CB radio that does AM and SSB on the 11 meter band. The problem was that the radio isn’t legal where he lives. So he decided to change the radio over to work on the 6 meter band, instead.

We were a little surprised to hear this at first. Most radio circuits are tuned to pretty close tolerances and going from 27 MHz to 50 MHz seemed like quite a leap. The answer? An Arduino and a few other choice pieces of circuitry.

In particular, removed much of the RF portion of the radio, leaving just the parts that dealt with the intermediate frequency at 7.8 MHz. Even the transmitter generates this frequency because it is easier to create an SSB signal at a fixed frequency. The Arduino drives a frequency synthesizer and an OLED display. A mixer combines the IF signal with the frequency the Arduino commands.

The radio had a “clarifier” which acts as a fine tuning control. With the new setup, the Arduino has to read this, also, and make small adjustments to the frequency. The RF circuits in the radio took some modifications, too. It is all documented, although we will admit this probably isn’t a project for the faint of heart.

2 replies, 107 views

Reply to this thread

Back to top Alert abuse

Always highlight: 10 newest replies | Replies posted after I mark a forum
Replies to this discussion thread
Arrow 2 replies Author Time Post
Reply CB RADIO + ARDUINO 6 METER HAM BAND (Original post)
wonderwarthog Aug 6 OP
Butchie_T Aug 6 #1
wonderwarthog Aug 6 #2

Response to wonderwarthog (Original post)

Tue Aug 6, 2019, 07:47 AM

1. Before I got my ham license I had a

Cobra 138XLR with a switch in the back of it (cough, post mod). It got 33 channels above channel 40 and 7 channels below channel 1. Unit 188 was on the air...

Reply to this post

Back to top Alert abuse Link here Permalink

Response to Butchie_T (Reply #1)

Tue Aug 6, 2019, 05:03 PM

2. Had a 148 GTLF

148 with frequency counter.

Had a mad scientist at the local truck stop (back in late 90's) mod it out.

Tunable across a VERY wide spectrum...

Was coming home from 3rd shift at sunrise, worked St. Martins island from Erie Pa.!

Reply to this post

Back to top Alert abuse Link here Permalink