Batboard

I want to experiment backing off the squelch on my Visar - although its already set quite low (27).

I've checked out the Help section of the RSS buts its a bit unclear for Visars set to 12.5KHz spacing.

Basically it warns about causing the radio to become insensitive if you try to adjust the 12.5KHz setting without first adjusting the 25Khz setting. Is this right??

It also says that the 12.5KHz settings are NOT displayed when you read the codeplug for a second time - only the 25 KHz settings - what you get is an "Squelch Adder" value - in my case its "-3".

In my Visar, there are 7 squelch settings - the first 3 values are low/mid/high freqs. The last 4 are just duplicates of the high band edge. How many frequency points do you need to use to set up the squelch - 1 , 3 or all 7??

Is the "squelch adder" an average of the difference between the 25Khz and 12.5KHz values - I guess maybe all the 12.5KHz values were set at "24" giving a "Squelch Adder" of -3 ???

Its all a bit confusing so I decided not to tweak any squelch softpot before getting some feedback.

Thanks

I'm getting a bit sleepy here but it looks as if you head the nail right on the head. The reason for the squelch "adder" is due to the limited memory in the Jedi and Visar control boards. They had to squeeze the tuning values in for all 3 bandwidths somehow.

Do you have to tune all 7? Yes I suggest that you do, generally doesn't make a HUGE difference but for those cases where there is a wide range of sensitivity you'll keep yourself covered. Or you can just tune right around the frequencies that your radio is operating on. Watch out for corruptions in the 12.5k tuning "Adder" they do occur and you'll get strange sensitivity if your channel is programmed for it.

g8tzl2004 wrote:
In my Visar, there are 7 squelch settings - the first 3 values are low/mid/high freqs. The last 4 are just duplicates of the high band edge. How many frequency points do you need to use to set up the squelch - 1 , 3 or all 7??

Its all a bit confusing so I decided not to tweak any squelch softpot before getting some feedback.

Thanks

Good that you did not 'tweek' the Visar and throw off the Receiver alignment.

There are several alignment points and these are at specific frequencies. They align the receiver frontend, NOT SQUELCH.

There are three Squelch settings, first 25 KHZ spacing squelch adjust, then 20khz, then the 12.5 khz spacing.

Thanks for the feedback.

Will - I was definately in the squelch alignment section. As far as I could tell ,"Front End" alignment is a completely seperate section within the RX alignment section.

The Visar RX alignment had several sections - from what I can remember it was something like:
- Rated Audio
- Front end
- 25 KHz squelch
- 20 KHz squelch
- 12.5 KHz squelch

I only looked at the 12.5KHz and 25KHz squelch settings - I did not "dare" look in the Front End section!!!

The comments about affecting sensitivity if you tweak the 12.5KHz squelch settings without first tweaking the 25Khz settings was mentioned in the squelch help pages - I would have thought that sensitivity would only have been affected if you start tweaking the front end!!

Both the 12.5KHz and 25KHz squelch settings involved 7 softpot settings (all set to 27) - the first 3 were low band edge/mid band/high band edge frequencies and the last 4 were duplicates of the high band edge frequency.

I got the feeling that you could actually input your own squelch alignment frequencies rather than having to use the default values - were where a bit odd - I would have expected 7 different frequencies spread across the band.

I'm even more confused now !!!

You are on the right track. Three bandwidths and the frequency points. It takes a while to go thru all of them.

Will is correct. And as far as the "duplicated" frequencies go just make the the same as the original frequency. Now the front end alignment you should just leave alone completely unless you change out the RF board. I've found that these NEVER really change over time. I don't think I once really "fixed" an issue with the front end by retuning one that had been out there for a while.