Monday, April 12, 2010

Motorola Radius GP300

I seem to be collecting VHF handhelds at the moment. This is the Motorola Radius GP300 I bought for £1 at the Blackpool radio exhibition yesterday. The seller had quite a number of shiny new-looking commercial handhelds in a heap on the table, all without batteries, which were being sold for £1 each. He told me they were all UHF. Most were Midland radios, but there was this one Motorola which in the end I decided to get because I thought it might be easier to find information about it. I should have got one of the Midlands as well, after all, it was only a quid!

Today I took a closer look at what I had bought, and tried to find out something about it from the internet. From the model number I was able to find out the capabilities of the radio and I actually have a VHF handheld which can cover 144 - 176MHz in 12.5kHz steps, 8 programmed channels with 5W output. I can't test if it works because I don't have an adapter for the strange type of antenna socket, but Motorola to BNC adapters are available on eBay. However for the radio to be any use I will need to program it with some 2m band frequencies.

There is information on the web showing how to build a programming interface, but you can actually buy one ready made from Hong Kong for little more than the cost of the parts. The difficulty appears to be getting hold of the all-important programming software. Apparently it was very expensive and Motorola doesn't turn a blind eye to free sharing of it among the amateur community so I was unable to find any download link.

None of the sites that give information about programming these radios provide any help about how to get hold of the software and they are obviously fed up with being asked about it. So there probably isn't much that I am going to be able to do with this radio. A pity, as it seems to be well regarded judging by the reviews on eHam, presumably posted by users who got them from dealers pre-programmed with the channels of their choice.

4 comments:

Steve said...

Can't help with this specific radio. But I do know that one of my local clubs has members who support commercial and public service communications, and as such have access to various professional/commercial gear. The point being, you might ask around at local clubs to see if you can find a friendly ham who'd let you drop in your radio into their environment for some configuration..

g4ilo said...

Hi Steve. There was a club meeting last night and I asked about it and apparently there is someone who can do this. I'd prefer to be able to do it myself if possible because with only 8 channels I may want to change them from time to time so I'm still pursuing that angle, but it's nice to know I won't be completely stuck if I can't manage it.

Peter said...

Hi
I manged to get a working copy from the following site ham.dmz.ro
There appears to ba small problem though, i can not program 145.425 or 145.525 all other frequencies work ok
contact me via e-mail if you need help
peterlake2003@yahoo.codotuk
Peter

Dennis said...

To program out of "band" frequencies - press and hold the shift key as you are typing the numbers (except for the decimal point) and make sure that you fill all spaces. For your example, you would enter !$%.$@%))) and !$%.%@%))) - this will enter those frequencies into your radio.