Spectra Bit Bang

[dmurman]

I have a 900 mhz Spectra that the command board and MLM started out as a VHF Spectra. I changed the model number in both the command board and MLM, changed the band on the MLM for 900 and made sure the serial numbers were the same.

The Spectra works 100% on 900 mhz. The issue I am having has to do when going to the SERVICE section of the RSS. When I go there the radio display shows 146.05 and when I transmit (F6) I get a frequency in the 500 mhz area.

My question, is there an area in the MLM and/or Command Board that needs to be changed to have the SERVICE section recognize the radio as a 900 mhz Spectra.

Again the Spectra is working 100% on the 900 mhz ham repeaters and simplex. Carrier and dev looks good on the service monitor and spectrum analyzer.


Thanks;
David

[Tom in D.C.]

I have a similar, but not as drastic, situation with a W5 900 mHz Spectra that had its MDF file redone to get it into the new hamband. In service mode it always reverts to something like 895 mHz although I don't think it will now operate there. It does its tuning at 895 nevertheless.
Doesn't give me the kind of problem, obviously, that yours does, but I'm thinking that the radio has some kind of separate memory when in service mode.

If you get this figured out please be sure the results are posted. I'd really like to have my radio doing its max RF out on 902 after I'd actually tuned it up on 902.

Regards,

[MikeOxlong]

My question, is there an area in the MLM and/or Command Board that needs to be changed to have the SERVICE section recognize the radio as a 900 mhz Spectra.

Probably needs the tuning frequencies changed in the codeplug.

I would guess they're stored in the codeplug along with the actual values.

[dmurman]

After thinking about my problem with the SERVICE section of the RSS I feel now it has to do with the CODEPLUG that I cloned into the MLM. The CODEPLUG was a VHF hi-band 128 conventional mode no trunking so at the time the MLM thinks it is a hi-band radio and changing the band selection in the MLM got the radio to work in the 900 mhz ham band. Was able to delete all the hi-band modes and added the 900 mhz modes probably does not change the MLM from thinking it is a VHF radio when in the SERVICE mode. I would like to get a 900 mhz 128 mode conventional only CODEPLUG for the radio to try and see if that is the problem.

As for the frequencies in the SERVICE section I see the same with another 900 Spectra I have. That one has trunking and 255 conventional modes which I cannot use to clone my other 900 Spectra. Already tried that and I no longer had the DPL. I don't think that frequency selection in the SERVICE section of the RSS will ever change unless someone can identify the areas in the MLM software to bit bang to change those selections.



David

[RADIOMAN2002]

Thats been a know issue for some timw, I havn't had the time to dissasemble a codeplug and look for that info. To fix the tuning you will need a conventional 900 mhz codeplug, clone the codeplug, not program into the radio. Apparently the tuning values are stored in the codeplug. I have the same issue on a UHF. It wants to tune with 406 values not the 450 the radio actually is on.

[JAYMZ]

There are coded portions of the codeplug that designate the frequency range of the radio... If those are not changed and you clone in or write a matching codeplug the software will read that info, but then see that a bit shows it as a different range and only allow you into the "old" tuning range of the radio.

Go into location 0x605F and change the value to 67 for the 900 MHz split.

http://www.repeater-builder.com/motorol ... nging.html

[Will]

JAYMZ's tip will not work, that is just a bit to tell the RSS the frequency range of the radio.
Bottom line David, is that you will have to get a MLM from a 900 mHz Spectra. The problem is the tuning points are embedded in the MLM/Command board.
I am willing to trade you for a genuine 900 Spectra MLM.

[RADIOMAN2002]

I have brought this topic up again since I have some time to play with it again. If there is anyone who has a VHF (136-172) Trunking Spectra codeplug I would appriciate if you could e-mail to me. I do have a few conventional and trunked 900 MLMs I could trade if you send me a VHF trunked one.