Thursday, May 19, 2016


If you own one you will understand this. It is about the LSB mod almost everyone would like to have done to their rig.

For non PRC owners and non hams the deal with these radios is they are a strictly upper sideband (USB) unit. This renders them next to useless on the 40 and 80 meter bands.

There are a number of modifications that can be installed in these sets to get them to be switchable to (LSB) lower side band.

For those  of us that are not technicians there are few people in the States that do this modification. Most of them are pretty damned expensive.  

I have found a reasonably priced source of this modification.

The man is N4RMT and if you are a ham you will know how to contact him. His email listed is valid and he understands these rigs. He made sure the gasket was in good shape before he reassembled it so I can still take it out in the rain.

It now works in LSB using what is commonly called the 'Battery check' method. No holes are drilled it is a simple case of turning the control to 'battery check' to put the rig on LSB.
As '320 owners know, on USB there is a 2 kHz up offset. For example to go to 14.332 you set the rig to 14.334, USB.

The offset for LSB is DOWN 1.2 kHz. An example of this would be to go in 7.175 you set the decade switches to 7.1738.

I am not posting the man's name or address here simply to cut the number of emails down that he will get.

He made me a video demonstrating mine. If you are a ham and a reader shoot me an email via my QRZ page or an IM through Arfcom if you are a member there. I'll send you a link.

I won't post the video here because my call sign is on the video and I keep that only for ham use. It's a PERSEC thing.

Anyway, this takes the as issued PRC 320 and makes it ham friendly on the lower ham bands at what is a reasonable price.   

Anyway, if you want the modification done simply email N4RMT. If you are a ham you know how to get in touch with him.

If you are not, please leave him alone.

To find out why the blog is pink just cut and paste this: NO ANIMALS WERE HARMED IN THE WRITING OF TODAY'S ESSAY


  1. I love my PRC-320. Actually that's how I found your blog.

  2. Hi there
    I am n1ykn
    how can I get more info on the 2kh ofset please

  3. Lee, of to N4RMT's QRZ page, get his email address and ask him about it. I think he can do that