HT1000 squelch adjustments

[t2k]

Like the solution found at http://batboard.batlabs.com/viewtopic.p ... 66&p=19872 I too had a radio (the same one that I have a clone error on) that the squelch was set too low on. It would unmute on any carrier-squelch freq. for practically any noise whatsoever.

Until I can get manuals and the proper equipment for "aligning" the radio I merely adjusted the radio to not break squelch when sitting near a laptop, which turned out to be somewhat lower than all my other HT1000s were set for. I know this is abominable practice, and a real tuning needs to be done, it was an expedient solution. As experts know (and what I learned) the values are replicated to the other Squelch Alignment settings. I compared them to well-aligned radios and those values were in the 30-33 range. I ended up with approximately the same. I know this is poor technique to set them this way but not having proper tools it was the best I could do to eliminate the issue. None of my radios operate on anything but carrier squelch so it was imperative to do something about this maladjusted squelch sensitivity.

The original "bad" values I saw were:

Squelch Alignment 25/30kHz H01KDC9AA3BN - 402AVJ4739

Test Frequency Value

136.02500 19
142.12500 20
154.22500 21
160.12500 21
168.07500 21
173.97500 20
177.97500 19

Squelch Alignment 20kHz H01KDC9AA3BN - 4021VU3241

Test Frequency Value

136.02500 19
142.12500 20
154.22500 21
160.12500 21
168.07500 21
173.97500 20
177.97500 19

Squelch Alignment 12.5kHz H01KDC9AA3BN - 4021VU3241

Test Frequency Value

136.02500 19
142.12500 20
154.22500 21
160.12500 21
168.07500 21
173.97500 21
177.97500 19

I just wanted to say thanks to all the folks who took the time to share their knowledge and I'm grateful for being able to access the site.

[Will]

As you see all the values are the same. Each radio will be different, that is why there are these adjustments. Looks like you cloned the radios...

A service monitor, a ac voltmeter, and a DC voltmeter is required to properly align/adjust the Jedi series radios.

[t2k]

As you see all the values are the same. Each radio will be different, that is why there are these adjustments. Looks like you cloned the radios...

A service monitor, a ac voltmeter, and a DC voltmeter is required to properly align/adjust the Jedi series radios.

Those were the original values before ever attempting to clone. The values I used to "solve" the open squelch issue were manually entered. I got the radio from ebay, I make a habit of recording everything per radio before I touch it (including making an archve copy of it's original codeplug)... I know about the proper way to do it, but at the moment i don't have: 1. service monitor, 2. documentation, 3. knowledge. I'm working on items 1,2 and 3

Although I certainly don't know the definitive answer not having enough knowledge, or experience, I have observed that radio setup parameters don't seem to be "clone-able" as after cloning I was curious and checked the source/target radios and alignment values for the softpots were different. I need to rtfm and study more though.

By the way, for the AC voltmeter, should that also be one capable of RMS readings? I have an older Beckman that can do that.

Thanks

[Will]

By the way, for the AC voltmeter, should that also be one capable of RMS readings? I have an older Beckman that can do that.

Thanks

That should work to read the noise during the frontend alignment. You also need the test box or suitable connections to the test points on the accy jack The alignment is covered in the Jedi service manual and I could send a excerp on the frontend alignment.

BTW, I have found on the Jedi Series HT1000, that cloning can change the alignment values.
Maybe the same 'codeplug' was put into each radio before you got them. That would support the same tuning values.

[t2k]

By the way, for the AC voltmeter, should that also be one capable of RMS readings? I have an older Beckman that can do that.

Thanks

That should work to read the noise during the frontend alignment. You also need the test box or suitable connections to the test points on the accy jack The alignment is covered in the Jedi service manual and I could send a excerp on the frontend alignment.

BTW, I have found on the Jedi Series HT1000, that cloning can change the alignment values.
Maybe the same 'codeplug' was put into each radio before you got them. That would support the same tuning values.

You know, you might be right, I did get all 4 of my units from the same person over the period of a few months. Ugh. I never considered that.

Meanwhile I need to start comparing some codeplugs. I know the serial numbers are different but since there were all from the same fire dept. that just went trunked, if the same person maintained them maybe that was why all this is happening.

Thanks very much for the information. It's not going to waste.

[Karfield]

All of that is correct. I'm going to answer the question as to why the settings were 20 to begin with. There is an ANCIENT SRN out there that covered the squelch sensitivity for VHF units. This was more to quell some of the complaints by PS agencies who had units that wouldn't give the range they thought it should they wanted the unit to open up at .22uV as opposed to the .35uV that the radio is rated at. As to your tuning method you aren't really all that far off. Squelch settings are hardly considered exact, if the user or company wants something less sensitive then by all means increase the value, and vice versa.

Now the other 2 squelch settings (20 and 12.5) are actually offsets this too can cause problems if your channel is programmed for 12.5 as opposed to the 25k that the unit is originally tuned to. If you find that the radio still opens up often then perhaps you are programmed for 12.5 and need to adjust the offset a bit by resaving the values equal to the 25k settings. (they show up equal but only the offset is saved to the radio memory)

I hope this didn't just confuse you more but I wanted to give you a full idea of how to tune the squelch in a HT1000.

[t2k]

Thank you, that also was very helpful. I'm taking (and preserving) alot of notes.