Maxtrac tuning data

[MP 6.7]

I have a 146-174 D33 Maxtrac that I've blanked and am now in the process of entering all the alignment data in the board replacement menus. The label on the RF board (HLD4322D) says 2567766 but RSS won't take it. Any number over 4000 on the last four digits won't work. Also, this is going into RX-only duty; does this number do anything with the receiver?

[RADIOMAN2002]

If I am not mistaken the number you are talking about has something to do with the temperature curve for the main reference oscillator. It really shouldn't effect a receive only radio unless you place radio in extreme temperatures.

[RFguy]

On the ones thatI have done, the number is on the side of the reference crystal (not on the circuit board it'self). It's a small white label with 2 rows of numbers.

[Jim202]

The bad part of what your doing is not going to set the RX onto the exact frequency. That is what the TX output frequency adjustment does. It also effects the RX frequency. If you don't reset this to the correct setting, you will probably have a receiver that is off frequency.

The only way I know of correcting this is to do the TX frequency alignment. There are 3 frequency settings that are done. The low, middle and high frequency selections. If your only going to use the radio on one frequency, then I would pick the selection that is closest to the test frequency the radio uses for the TX alignment.

Jim

[MP 6.7]

On the ones thatI have done, the number is on the side of the reference crystal (not on the circuit board it'self). It's a small white label with 2 rows of numbers.

That one worked fine, but it also needs the 7 digit number on the board which is the one that it won't take. I'm pretty sure I'm reading it right, but you never know with the handwriting on some of those labels...

[kcbooboo]

The sevens could be ones. I've seen sevens with a line through the middle and also seen ones that have a flag on the top that could make them look like sevens. Worth a shot.

Bob M.

[MP 6.7]

Here's a photo of the label...up for interpretation...

[kcbooboo]

Yup, sure looks like 2567766; hard to deny that.

I have run into radios with TWO tuning data stickers on them, with vastly different numbers, but this one looks legitimate.

Strange that you can't enter that number.

Bob M.

[RADIOMAN2002]

Maybe it's 2567700? Or 2507766 or 2507700 or 2567760. I would try a few combinations.

[Nand]

Second 7 is likely a 4

Nand.

[kcbooboo]

I tried entering the tuning data (7-digit value) into a blank radio with an HLN5172 5-pin logic board. The program I used was conventional MaxTrac R07.02.00a dated 25-Jun-97. I saved the original code plug and blanked the radio, then went into the board replacement screen.

I chose MaxTrac, MaxTrac 300, 806-870 MHz, an appropriate model number (35w, 16ch, PL+TPL, Scan), Panel 001, 438FNNxxxx.

The three digit field would only allow 210-310 inclusive.
The four digit field would only allow 6000-7000 inclusive.

I don't know if the tuning data fields depend on data entered into the crystal data fields or on data entered on the very first screen. I used the value on the crystal in my particular radio (an 800 MHz unit).

I'm thinking that the label in the photo is NOT the tuning data sticker, even though it sure looks like one.

Bob M.

P.S.: Hi Nand.

[Nand]

A VHF radio here has the label with H 260 3929.

Nand.

P.S.: Hi Bob.