Jedi - RX problem - can I swap RF board with similar model?

[g8tzl2004]

I have just acquired an MT2100 UHF radio. Details are as follows:

Type : PJ502D
Model : H01RDD9PW1BN

The MT2100 seems to work OK on TX but I think there is a problem with the RX side.

When you open the SQ (to get white noise), instead of a steady "hiss" , there is an unstable burbling noise. BUT when you inject a weak signal for a brief second , the RX side then gives the usual white noise. BUT if you TX for a brief second , the unstable RX burbling noise is back. Its definately not local QRM etc - you might also not notice the problem if the SQ was just kept close - but if you are monitoring a carrier and press the PTT , when you dekey , there is a very brief "burble" - if there was no test carrier and the SQ open , the burbling would be there all the time.

I think I had a similar problem with a VHF MT2000 but it was also 5KHz off freq - at the time I think the Batlabs experts thought it was probably a bad IF IC (which is difficult to replace).

Any thoughts on the MT2100 problem?

I have a couple of spare GP900 / GP1200/ MTS1200 RF boards. Can I just replace the RF board from the MT2100 with , say , a GP900 RF board? Will I need to realign the "replacement" RF board when it is installed into the MT2100 - or is the alignment info held on the RF board rather than the control board??

Thanks

[g8tzl2004]

Any thoughts on above?

Thanks

[g8tzl2004]

Any thoughts?

Thanks

[Jim2121]

do you have access to a service monitor to put these radios on?

[mruwave]

I've heard a similar sound when the radio is in 'SCAN' mode. Is that possible?

[g8tzl2004]

I don't have a service monitor - just basic test gear - but enough for ham radio use

If I change the RF board, do I need to realign the replacement board? Is the alignment data held on the control board - so the replacement board will end up with the old board alignment settings if I don't realign??

Thanks

[Karfield]

This Jedi does not sound familiar to me however the model number suggests that it's deffinately a Jedi. As for your question yes, you will have to realign the front end, power, freq error, etc on that unit if you swap out the rf board. All data for the radio is saved on the controller board.

[Keygun]

Yes, i have also encountered that phenomenon on a number of Jedis.

I was also told, the problem is associated with the IF/AGC. In most
cases it won`t affect normal operation, but nevertherless it sucks.

I really like the JEDI series, but my experience is, that the are
some of the most bug-plagued radios made by big M.....

And yes, you can use an GP900/MTS rf-board of the same bandsplit. But even it will work without realignment, you should realign the radio.

Keygun