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LSB 38 freq

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LSB 38 freq

Post by 973Kid » Monday, 18 December 2017, 22:09 PM

II just got a 2000 GTL that I picked up on that auction site. This is the first radio that I have had with a freq counter. 38 AM is on point with 27.3850. LSB shown 35.1825. Is that right? I was just thinking that LSB would be like 27.380 or something.

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Re: LSB 38 freq

Post by jessejamesdallas » Tuesday, 19 December 2017, 3:31 AM

973Kid wrote:
Monday, 18 December 2017, 22:09 PM
II just got a 2000 GTL that I picked up on that auction site. This is the first radio that I have had with a freq counter. 38 AM is on point with 27.3850. LSB shown 35.1825. Is that right? I was just thinking that LSB would be like 27.380 or something.

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No...not even close. :shock:

AM or SSB, don't mater, frequency should read the same...someone "may have" added some funny channels to that radio, and for some stupid reason used the Mode knob to go to those channels...
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Re: LSB 38 freq

Post by 295 antenna » Tuesday, 19 December 2017, 11:05 AM

I concur with JJ thats what it sounds like
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Re: LSB 38 freq

Post by MDYoungblood » Tuesday, 19 December 2017, 13:07 PM

Sounds like time for caps and an alignment.

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Re: LSB 38 freq

Post by 973Kid » Tuesday, 19 December 2017, 14:07 PM

Looks like I eill be making a visit to the cb shop. I was able to fix the d-104 myself but I'm not touching the inside of this radio. The mic had a battery in it so long that it rusted rotted and leaked. I just had to remove the battery and battery connector then re solder a new connector in place. That is about the extent of my golden screwdriver..

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Re: LSB 38 freq

Post by redlght » Sunday, 24 December 2017, 18:03 PM

If you are reading 27Mhz on other modes AM and USB and 35MHz on the counter in LSB then it is not getting the LSB 7 MHz offset freq. I would check test point 3 at CH19 LSB for 7.7985Mhz signal if it is not there then check the mode switch then the LSB Xtal osc circuit.

35.1835 on the counter would be 38 LSB minus xx.xx10 Mhz and missing the LSB offset freq

The counter in the 2000gtl uses the 11.1125MHz trippled freq of 34-35 MHZ at (TP Test point) TP1 minus the mode offset freq at TP 3
7.8000 MHz for AM
7.7985 MHz for LSB
7.8015 MHz for USB

Example: CH20
AM 35.0050Mhz at TP1 - 7.8000 MHz at TP3= 27.2050 MHz
LSB 35.0035Mhz at TP1- 7.7985 MHz at TP3= 27.2050 MHz
USB 35.0065Mhz at TP1- 7.8015 MHz at TP3= 27.2050 MHz

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Re: LSB 38 freq

Post by kf4eyr » Monday, 25 December 2017, 10:39 AM

i would be checking making sure the clarifier hasnt been opened up before doing any messing with the internals,,,,if opened it would do what he is getting,,,,

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Re: LSB 38 freq

Post by redlght » Monday, 25 December 2017, 20:03 PM

If the counter is reading 35 MHz no way in heck an unlocked clarifier can skew it 10MHz. I have worked with tons of these and it is a fact that 35Mhz on the counter it is missing the offset freq input given that it reads correct on AM the counter works and it is getting the 7.8Mhz am offset freq and the voice lock is working.

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Re: LSB 38 freq

Post by MDYoungblood » Monday, 25 December 2017, 20:32 PM

I think redlght is right on the money, if the problem is only LSB try adjusting L30 but most likely someone got into the radio to try and adjust the SSB and broke the load/choke/coil, whatever term you like to use. You could get the PLL go screwy by the clarifier if you have it choked up to slide up or down over 10kc. When making adjustments always have the clarifier centered.

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Re: LSB 38 freq

Post by redlght » Monday, 25 December 2017, 21:15 PM

What does it read in USB mode?


I would like to know if it tx's at all on say ch20 lsb (with a 1KHz tone at mic input or use a second radio as a receiver) on the right freq with an external counter then only the internal counter isnt getting the offset freq. If the offset freq wasn't getting mixed in it would go unlocked and the tx inhibit would activate and not transmit.


If it does TX on LSB to a second radio on the right frequency then i would look at the plug for the 35 and 7 mhz input to the counter for a bad or broke connection first or fet502 went bad. I have also seen dirty or bad mode switches cause this.

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Re: LSB 38 freq

Post by bluemeanie » Thursday, 11 January 2018, 8:21 AM

How far away is the CB shop?
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Re: LSB 38 freq

Post by redlght » Sunday, 14 January 2018, 1:50 AM

bluemeanie wrote:
Thursday, 11 January 2018, 8:21 AM
How far away is the CB shop?
Venus?


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