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#1
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Pro-38 Scanner Mods
I've read loads of posts about the 29-54MHz
mod for this scanner. I know most people are trying to change this band for the 66-88MHz band, but like other Brits, I'm trying to do the opposite.The problem is, all the instructions I keep finding are unclear as to what exactly I'm removing, since the guys doing it the other way just need to fill in the blank link. I'm trying to find out which of the diode, two fuseable resisitors and 100k resistor I should be removing!! More concerning though is what someone said about not actually receiving anything below 39MHz, despite being able to input the frequencies. Has anyone managed to grip this problem? I only just bought this scanner for my other half to stop her knicking my Kenny TH-F7E (Grrr), and of course, it's the stuff below 39 that's of greatest interest to her!! ;o) Would appreciate any help and advice. Steve |
#2
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hehe.
i work with them & own a pro-39. i've never managed to make it RX anything.as u say will program ok but no rx. never been able to do it. it would be nice! the only thing i have found before (and that was on a 38 like yours) is that the published mod does not seem to kill rx on 66-88 . so it must be wrong. hope we get some help! mike "Steve" wrote in message om... I've read loads of posts about the 29-54MHz mod for this scanner. I know most people are trying to change this band for the 66-88MHz band, but like other Brits, I'm trying to do the opposite.The problem is, all the instructions I keep finding are unclear as to what exactly I'm removing, since the guys doing it the other way just need to fill in the blank link. I'm trying to find out which of the diode, two fuseable resisitors and 100k resistor I should be removing!! More concerning though is what someone said about not actually receiving anything below 39MHz, despite being able to input the frequencies. Has anyone managed to grip this problem? I only just bought this scanner for my other half to stop her knicking my Kenny TH-F7E (Grrr), and of course, it's the stuff below 39 that's of greatest interest to her!! ;o) Would appreciate any help and advice. Steve --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.716 / Virus Database: 472 - Release Date: 05/07/2004 |
#3
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At least I'm not the only one then!!! Out of curiosity, which
component should I be removing for the mod? I can only find references to "the blank link near the top left corner of the IC", which obviously don't help much when there's no blank link!!! Lol. Can you shed any light Mike? Cheers, Steve |
#4
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i think the mod for the pro-39 is on www.mods-dk steve.
the otherone might be there also. mine is written on the back of a service sheet from radioshack which i got years ago. it relates to a link by a 100k resistor be the ic. not my writing sadly. i know i tried a 38 my mate had years ago, but we could not reset the cpu even by pressing the buttons. mike "Steve" wrote in message om... At least I'm not the only one then!!! Out of curiosity, which component should I be removing for the mod? I can only find references to "the blank link near the top left corner of the IC", which obviously don't help much when there's no blank link!!! Lol. Can you shed any light Mike? Cheers, Steve --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.717 / Virus Database: 473 - Release Date: 08/07/2004 |
#5
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Does that mean the 100k resisteor IS the link, or it's a link near the
resistor? I got the details of the mod of mods.dk, but it's not specific enough, and everyone else just copies the same mod on their pages!! Basically, the layout is :- FR Di Tr - - - - FR | | | |-| - - - ----------------------------- - | | | | - | | | 100k | | - | | | | | | | I C | | | | | | | | | | | | | | | ----------------------------- Where Tr is a Transistor, FR is a Fuseable Resistor, Di is a Diode and IC is obvious!!! Maybe someone can clarify (if you're not able to Mike) which of these components needs removing? Apologoes in advance for the poor quality of my diagram!!! He he Steve |
#6
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Does that mean the 100k resisteor IS the link, or it's a link near the
resistor? I got the details of the mod of mods.dk, but it's not specific enough, and everyone else just copies the same mod on their pages!! Basically, the layout is :- FR Di Tr - - - - FR | | | |-| - - - ----------------------------- - | | | | - | | | 100k | | - | | | | | | | I C | | | | | | | | | | | | | | | ----------------------------- Where Tr is a Transistor, FR is a Fuseable Resistor, Di is a Diode and IC is obvious!!! Maybe someone can clarify (if you're not able to Mike) which of these components needs removing? Apologoes in advance for the poor quality of my diagram!!! He he Steve |
#7
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remove the diode steve.
i'd just lift one end or if it is surface mount take it out then use a 1n914 or 1n4148 to replace it if necess. mine (39 would not rx, but i think my vco is not set low enough. mike "Steve" wrote in message om... Does that mean the 100k resisteor IS the link, or it's a link near the resistor? I got the details of the mod of mods.dk, but it's not specific enough, and everyone else just copies the same mod on their pages!! Basically, the layout is :- FR Di Tr - - - - FR | | | |-| - - - ----------------------------- - | | | | - | | | 100k | | - | | | | | | | I C | | | | | | | | | | | | | | | ----------------------------- Where Tr is a Transistor, FR is a Fuseable Resistor, Di is a Diode and IC is obvious!!! Maybe someone can clarify (if you're not able to Mike) which of these components needs removing? Apologoes in advance for the poor quality of my diagram!!! He he Steve --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.718 / Virus Database: 474 - Release Date: 09/07/2004 |
#8
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Basically, PRO-38 the layout is:
Rx D206 Q212 - - - - R250 | | | |-| 0 - - - ----------------------------- - | | | | - R229 | | | 100k | | - | | | | | | | IC201 | | | | | | | | | | | | | | | ----------------------------- Q212 is a transistor, R250 is a 0 Ohm jumper, D206 is a diode and IC201 is the CPU. The US service manual does not indicate what RF components to change if converting from European VHF LO to US VHF LO. Removing Rx should set the VHF LO plan to US. Removing D206 will probably keep the radio from scanning. Rx is probably a 0 Ohm jumper that connects IC201 pin 66 to ground. Pin 66 is the second one down from the top on the left side of IC201. You will need a Euro service manual to find out what RF components must be changed for good RF performance. A realignment would be needed as well. The ASCII drawing may look better if this message is copied to the clipboard and pasted into Notepad. It all depends on your browser. |
#9
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Cheers Frank and Mike. Will try the Rx mod first to see what happens.
Wonder if anyone's had any joy with retuning to get it to receive these frequencies? Steve "Frank346" wrote in message . .. Basically, PRO-38 the layout is: Rx D206 Q212 - - - - R250 | | | |-| 0 - - - ----------------------------- - | | | | - R229 | | | 100k | | - | | | | | | | IC201 | | | | | | | | | | | | | | | ----------------------------- Q212 is a transistor, R250 is a 0 Ohm jumper, D206 is a diode and IC201 is the CPU. The US service manual does not indicate what RF components to change if converting from European VHF LO to US VHF LO. Removing Rx should set the VHF LO plan to US. Removing D206 will probably keep the radio from scanning. Rx is probably a 0 Ohm jumper that connects IC201 pin 66 to ground. Pin 66 is the second one down from the top on the left side of IC201. You will need a Euro service manual to find out what RF components must be changed for good RF performance. A realignment would be needed as well. The ASCII drawing may look better if this message is copied to the clipboard and pasted into Notepad. It all depends on your browser. |
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