Spectra question

ayaresr · Post by **ayaresr** » Sat Oct 14, 2006 7:09 pm

What model number would I be looking for to cover 500-502 MHz. The chart on batlabs isn't real clear on the exact range.

bellersley · Post by **bellersley** » Sat Oct 14, 2006 7:35 pm

Range 1: 403-433
Range 2: 438-450
Range 3: 450-470
Range 4: 470-512

This is what I have scribbled down in my notes. Someone might want to confirm.

ayaresr · Post by **ayaresr** » Sat Oct 14, 2006 7:38 pm

When you list these range numbers, are they in the model number anywhere? Or am I just depending on the person selling it to know what they are talking about?

Will · Post by **Will** » Sat Oct 14, 2006 8:40 pm

No, unfortunately, the range is nowhere in the Model OR ID numbers. (Even the FCC ID number shows 403-512)

Also on Spectra 'tags' the "Model NO:" is accually the FCC ID number and the ID NO: IS the Model number, D44KMA....

If the radio IS stock you can read the radio and the Range is given in the Radio Wide screen. But if it has been hacked, ect., then you have to look for the accual board numbers on the VCO and the RF frontend boards.

The correct ranges are:
Range 1: 403-433
Range 2: 438-470
Range 3: 450-484
Range 4: 480-512

Note:there were some 450 to 470 ranged radios in the early Spectra days.

And looks like you need a Range 4 radio.

I have a Hi power STOCK Range 4 Spectra if needed.(PM for details)

ayaresr · Post by **ayaresr** » Sun Oct 15, 2006 3:45 pm

Next question: Is there an easy way to change what frequency range the radio is on? In doing this, would I be losing the added options such as trunking and whatnot? Thanks, Ryan

kcbooboo · Post by **kcbooboo** » Mon Oct 16, 2006 2:46 am

There's no EASY way, unless you have all the assemblies to swap from another radio.

The PA is range-dependent. The RF pre-selector is range-dependent. The VCO is range-dependent. The RF board is unique for each BAND. The command board and control head are the only assemblies that are not range, frequency, or band dependent.

You might get a particular range radio to operate +/- 5 or +/- 10 MHz from its designed range, with reduced sensitivity or output power. A bit of tweaking of the VCO might also be required.

But basically you can NOT shift operation from one range to the next without a lot of work, parts, and alignment effort after that.

Bob M.