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Motorola Spectra UHF Mods For Ham ???

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TA5FW

Member
Joined
Mar 10, 2008
Messages
7
Location
TURKIYE
Hello,
I have Motorola Spectra UHF mobile radio.
Model: D44KMA7JA5BK

I want to use this radio in ham frequecies (430-440Mhz) (Europe band range.)
I need mod it's rss for can programing in ham band range.
But I couldn't success yet.
Who has more experince than me, please help to me about this.

Many thnx
73's

Korhan BÜKEN - TA5FW
 

TA5FW

Member
Joined
Mar 10, 2008
Messages
7
Location
TURKIYE
I want to use in ham band plan (430-440Mhz)
Normal RSS is not support. Radio not working on these band range.
 

N4KVE

Member
Joined
Mar 1, 2003
Messages
3,029
Location
PALM BEACH, FLORIDA
It would help if we knew the coverage of the radio you now have. 403-433 mhz, or 450-483 mhz. The model number doesn't indicate which version you have. Even if you "mod the RSS" you might still have to deal with VCO mods so the VCO will lock in the bandsplit you want. Even if you do the VCO mod, there are specific circuit boards made to operate in specific bandsplits, so RX sens could be poor. For example, in the US, most Spectra's were the 450-483 split. Even if you mod the VCO, the RX sens will be quite poor below 445 MHZ because the wrong circuit boards will be in the radio. Installing 438-470 boards will fix that problem right away. Good luck.
 

WA9TED

Member
Joined
Sep 8, 2011
Messages
42
Location
Milwaukee
Hello,

Getting spectras to work on the 440 band isn't complicated at all. (Even for the euro split) it'll be just a simple hex edit which you can find on batlabs or maybe repeater builder to your RSS. If your never programmed with RSS before you'll know that you need to run it
In straight DOS. Youll find that batlabs gives you step by step guidelines to make the mods. You don't have to be a CS major to do it! But after you do the hex edit to the RSS,
You'll be able to just enter the freqs right in. Now depending on different radios you may need to do some tweaking of the VCO, but otherwise you should be in good shape. Usually the spectral will go down with little issues.

P.S. if you don't already know, the capacitors in older spectral tend to leak so it may be a good idea to replace them if they haven't already.

Good luck and feel free to PM me if you have any questions!
 
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