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  #1 (permalink)  
Old 04-28-2012, 4:21 PM
   
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Default Model 20-106, Pro-25 scanner, How does it work?

I picked up the scanner at a garage sale. It has 3 crystal oscillators in it:
153.370 MHz
470.8875 MHz
470.3875 MHz

The scanner can apparently support:
30-50 MHz, 118-136 MHz, 144-174 MHz, 450-470 MHz


I can get some activity on one of the channels (470.8875). I am new to this hobby, and would like to know a couple of things:

1. There is a switch near the crystals, what is the purpose of the switches? I assume this is for a fine tuning of the frequency band?
2. How do I tell what services and what towns use the above frequencies?
3. can I add a new crystal to any one the 8 available sockets? or will some of the sockets only support certain frequencies?

Does anyone have a manual or users guide for this scanner?

I checked the web and also searched this forum and didn't find anything.

thanks,
Howard
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Old 04-28-2012, 6:19 PM
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Default

The good news is I found a manual. The bad news is that the following is the entire contents of the file:

Switch Settings

A -- VHF Aircraft band
L -- VHF Low Band
H -- VHF High Band
U -- UHF Band
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Old 04-28-2012, 6:56 PM
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Do a search on the frequencies here on RR. Any socket will support any band, that's what the switches are for.
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Old 04-28-2012, 7:00 PM
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Default Manual

I have the manual for the Pro-25, it is the first scanner I bought back in '85 and it still works. There isn't much to the 15 page manual but if you would like a copy I will scan it into a PDF for you, pm me with an email address to send it to.

Edit: to answer your other questions:
1. The switches tell the radio which band the crystal's frequency is in, the switch would be in H position for the 155.370 crystal and U for the other two.
2. NC4DX and jaspence answered this one, do a search here on RR for the crystal's frequencies to see if they are in use in your area.
3. Yes, but they have to be the type of crystals the radio will support and a frequency within it supported ranges.

I agree with jaspence, you would be better off buying a used programmable scanner than buying crystals for this radio.


Quote:
Originally Posted by howdo View Post
I picked up the scanner at a garage sale. It has 3 crystal oscillators in it:
153.370 MHz
470.8875 MHz
470.3875 MHz

The scanner can apparently support:
30-50 MHz, 118-136 MHz, 144-174 MHz, 450-470 MHz


I can get some activity on one of the channels (470.8875). I am new to this hobby, and would like to know a couple of things:

1. There is a switch near the crystals, what is the purpose of the switches? I assume this is for a fine tuning of the frequency band?
2. How do I tell what services and what towns use the above frequencies?
3. can I add a new crystal to any one the 8 available sockets? or will some of the sockets only support certain frequencies?

Does anyone have a manual or users guide for this scanner?

I checked the web and also searched this forum and didn't find anything.

thanks,
Howard

Last edited by servo13; 04-28-2012 at 8:29 PM..
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Old 04-28-2012, 8:12 PM
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Default Crystals for scanner

This is an old scanner, and you will probably find that you can buy a used programmable scanner for less than eight new crystals will cost. You might find some used or old stock on line, but all scanners don't use the same type or size. As far as finding what you are hearing, go to RR, look up your state and town, and look through the conventional frequency list.

Last edited by jaspence; 04-28-2012 at 8:19 PM..
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Old 04-29-2012, 9:23 PM
   
Join Date: Apr 2012
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Default Thanks!

Thanks for the replies. Ill take your advice and buy a used programmable scanner. Is there a good make/model I should be looking at? And where is a good place to buy, ebay?

thanks,
howard
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