Could someone please provide some clarification:
I want to convert a MT2000 UHF to VHF without performing an alignment. I want to use an RF deck from a working VHF HT1000.
Is this as simple as:
1. Recording all the softpot values from the HT1000 before removing the RF deck,
2. Installing the RF deck from the HT1000 into the MT2000,
3. Updating the softpot values in the MT2000 so that they correspond to the softpot values from step 1 above
Is that it?
And then if I wanted to, I could do the same for the UHF RF deck so that I'd have a working HT1000 UHF also??
Please tell me it's as simple as 1-2-3!!
Thanks in advance
Jedi RF deck swap question
Moderator: Queue Moderator
Re: Jedi RF deck swap question
Good luck with that..tdc4125 wrote:I want to convert a MT2000 UHF to VHF without performing an alignment.
The only part that you are on the money with is putting the VHF RF deck into the MT2000. You will need a VHF archive or s-record, and a way to force it into the MT's controller.. You will then need a complete alignment of the radio for it to function properly.
-Marc
Stupidity creates job security!
If your radio has old firmware, programming it with the latest CPS will not add any new features unless you have the latest firmware to match..
CPS = Customer Programming Software, Not CPS Software.
If your radio has old firmware, programming it with the latest CPS will not add any new features unless you have the latest firmware to match..
CPS = Customer Programming Software, Not CPS Software.
Re: Jedi RF deck swap question
As stated previously, you can swap XCVR boards, but you will have to realign the radio no matter what.
Each XCVR board uses different VCO crossover frequencies for tuning, and these correspond to each controller board used also.
Many later versioned XCVR boards in UHF used a 'low split' VCO crossover like 438.925 or the like, whereas the later version boards use 449.500, and you will see these differences in the service menu for the VCO crossover alignment, and you would have to enter the new data for the updated XCVR board, or you will have problems with operating bandsplits in the radio.
Also, due to the change in the VCO crossovers, you will need to retune the front end filters on the radio as well, again, due to the differing VCO alignment points...they all go hand in hand with each other and affect radio performance.
It's no longer a shift key entry problem here, but a rather full blown realignment if you expect the radio to perform within spec, and to meet spectral purity, channel rejection and sensitivity requirements.
Don't forget deviation adjustments either, nobody wants to hear over deviated audio, and with narrowbanding coming up on all of us shortly, you will have audio clipping issues to contend with from deviation falling outside the passband, IE...4.2Khz. max., to +5Khz. deviation, which will take the modulation index far above 9 Khz. or higher and be illegal to use because of it.
Not to mention that probably no repeater would be able to handle such deviation to begin with.
PL deviation should never exceed .750 Hhz. with no audio(carrier only).
PL deviation in narrowband should not exceed .500 Khz.(carrier only).
Note: 12.5 Khz. channels are normally 2.5 Khz. deviation limits. So you end up with a maximum deviation(modulation index of 5 Khz. total) to still be within FCC limits for purity and channel bandwidth.
The older Micors used to have 'IDC" for this very purpose...to limit the maximum deviation to no more than 4.5 Khz. for a max. of +/- 9 Khz. deviation, to stay within the allowable limits for transmitted audio.
'IDC' stands for:(Instantaneous Deviation Control)
Each XCVR board uses different VCO crossover frequencies for tuning, and these correspond to each controller board used also.
Many later versioned XCVR boards in UHF used a 'low split' VCO crossover like 438.925 or the like, whereas the later version boards use 449.500, and you will see these differences in the service menu for the VCO crossover alignment, and you would have to enter the new data for the updated XCVR board, or you will have problems with operating bandsplits in the radio.
Also, due to the change in the VCO crossovers, you will need to retune the front end filters on the radio as well, again, due to the differing VCO alignment points...they all go hand in hand with each other and affect radio performance.
It's no longer a shift key entry problem here, but a rather full blown realignment if you expect the radio to perform within spec, and to meet spectral purity, channel rejection and sensitivity requirements.
Don't forget deviation adjustments either, nobody wants to hear over deviated audio, and with narrowbanding coming up on all of us shortly, you will have audio clipping issues to contend with from deviation falling outside the passband, IE...4.2Khz. max., to +5Khz. deviation, which will take the modulation index far above 9 Khz. or higher and be illegal to use because of it.
Not to mention that probably no repeater would be able to handle such deviation to begin with.
PL deviation should never exceed .750 Hhz. with no audio(carrier only).
PL deviation in narrowband should not exceed .500 Khz.(carrier only).
Note: 12.5 Khz. channels are normally 2.5 Khz. deviation limits. So you end up with a maximum deviation(modulation index of 5 Khz. total) to still be within FCC limits for purity and channel bandwidth.
The older Micors used to have 'IDC" for this very purpose...to limit the maximum deviation to no more than 4.5 Khz. for a max. of +/- 9 Khz. deviation, to stay within the allowable limits for transmitted audio.
'IDC' stands for:(Instantaneous Deviation Control)