| Author |
Message |
    
Sierraz71
New member
Username: Sierraz71
Post Number: 1
Registered: 9-2005
| | Posted on Sunday, September 25, 2005 - 4:46 am: | 
|
Was given a 2000, owner recently passed. It powers up, noise out of speaker, no signals. Can't believe no one was around, in a populated area. Seems to transmit, swr is down into an antenna, power out swings needle. I have been checking the postings, a lot of info here.
Question: rig has mods. 8719 chip, but with 1K resistors coming off pins 11 + 12, going into a dpdt 3 pos switch, pin 10 goes to a spst sw. Anyone know about this?? Clarifier mod done, a solder bridge or two on bottom of board, and the driver/final has had some attention, heat sink compound all over. The freq. counter isn't doing too well either.
Would a Galaxy FC-347 work on this?
Any help or direction appreciated. Thanks |
Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 698
Registered: 9-2004
| | Posted on Sunday, September 25, 2005 - 11:29 pm: |
|
there are some fixes for the erratic freq. counter.
check the yah00 group called "2000gtl owners club"
in the files section, there are repair notes as to what parts need to be replaced.
do a search on this forum for "2000gtl" and read the posts and bookmark them. there is A LOT of info on here for these radios.
also do a g00gle search for "2000gtl mods" and you will find some stuff.
these radios are all old by now and will all need some TLC.
the switch mod on your radio is for extra channels. most likely you had the radio on some frequency that is outside of the normal 40 channels. without any skip rolling in, these freqs. will be totally quiet. DO NOT TURN OR CUT ANYTHING IN THAT RADIO!!!
at this point im guessing that you have a radio that has been tuned up and modded.
i personally run a 2000gtl every day of the week.
if you need advice about what to do to and with this radio you can PM me.
i'd be happy to help get another one of these fine radios on the air again!
here's how your switches work:
the three pos. switch will give you a new 40 channel band in one position, from 27.605 to 28.045
in another pos. it will give you 27.455 to 27.725 on channels 15-40.
and in the other it will give you the normal 40 channels from 26.965 to 27.405. this is where you want to set it for normal operation. if the freq. counter works at all, you should be able to find out where you are. go to channel 19 in the normal band and try to get a radio check.
the other switch is probably a +10khz switch which will put the radio one channel higher than the one displayed on the channel selector.
good luck, you've got a great radio there,
matt |
Sierraz71
New member
Username: Sierraz71
Post Number: 2
Registered: 9-2005
| | Posted on Tuesday, September 27, 2005 - 5:35 pm: |
|
KV- Thanks for the info, I found one of the added switches bad, replaced same, and got the channels, at least the std 40. Will check on upper and lower later. Still no receive, tho. Will look thru the posts on receiver here, waiting for approval on the Yahoo group. Also, the freq. display needs attention. Shows 92 2002 on recv and 87 8101 on xmit.
Bob |
Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 707
Registered: 9-2004
| | Posted on Tuesday, September 27, 2005 - 11:07 pm: |
|
you'll probably be waiting a while for the approval, so i went ahead and got the info for ya.
in the freq. counter, replace D528 with an NTE-136A (1 watt zener)
FET501 and 502 also need to be replaced in most by now. in the older models, (taiwan) replace them with 2SK19GR
in the newer ones, use 2SK192A.
also, check TR41, it is mounted to the aluminum heatsink on the right side of the radio.
if it is a 2SC1419 or 2SC1135, then replace it with an NTE-152. this helps voltage stability.
now, as for your problem of not copying any stations; it would be nice if you had a walkie talkie that you could key up to find out if you have a weak receiver or no receiver.
if you have no receiver, the most likely case is that the person who added the switches for channels noticed that some retuning of the VCO was necessary after the mod, and tried to do it without a freq. counter or the proper tools and info.
here's how to fix it if that's the probem. (try it no matter what, if you have the right tools and some patience, you wont break anything.)
get the correct PLASTIC (no jewelers screwdrivers)
tool to fit inside the small tuning cans in your radio. its probably black and made by GC electronics. if you cant find one locally try mcm electronincs.
using a digital voltmeter, on the DC voltage scale; put the black lead to ground (PC board not chassis) and the red lead to TP9. (its right behind the PLL looking from the front).
put the radio on the normal CB channels and tune it to channel 40. now adjust L19 SLOWWWWWWLY until the voltmeter reads 3.20 volts. it is VERY touchy to adjust this. (you'll see).
now go to channel 1 and check for 2.20 volts. if its close to that number, then leave it. if its like 1.2 or something, you have to try again or you have a bigger problem.
this should get the freq. counter working again so try this before you buy any parts for the freq. counter.
now that we've got the PLL somewhat aligned, we need to give the receiver a tune up.
go to channel 19 and switch to USB.
using a plastic tuning tool, (the same one) slowly adjust these cans in this order for maximum noisefrom speaker/s meter reading. then go back and do it again the same way.
here's the order. (dont crack any slugs or you'll be very unhappy!)
L14, L12, L10, L9, L8, L7 (now repeat)
now go to AM mode and do the same thing on these cans.
L15, L13, L3. (make a mark before turning these so you can put them back if need be. sometimes they dont make any difference and you'll want to put them back the way they were.)
if you'd like to see all the mods ive done to my 2000gtl, find a thread titled "my 2000gtl" on this forum.
good luck, let me know how this works out,
matt |
Yankee
Advanced Member
Username: Yankee
Post Number: 941
Registered: 7-2003
| | Posted on Wednesday, September 28, 2005 - 5:55 pm: |
|
Yes, a FC-347 counter will work on the 2000. But I believe that the 2000's counter has to be unhooked. There is a mod that has to be done on the inside of the FC-347 with a dob of solder so it will read correctly. Just follow the installation info. for the 148-GTL. |
Sierraz71
New member
Username: Sierraz71
Post Number: 3
Registered: 9-2005
| | Posted on Wednesday, September 28, 2005 - 9:17 pm: |
|
K V and Yankee..Thanks for all the info, Good news and other news. I verified that the receiver would work. Connected my wire antenna and went to 19am, and heard some very weak signals. Keyed mike for effect, and someone came back, about 5mi. away. Then another guy came on and said that I was off freq, and as loud on 18 as 19. I'll be following your instructions on aligning the VCO. It seems that the clarifier has quite a range, and is not centered. Things looking up, I'll be working thru the lists of things to check. I did find R44 clipped, will keep looking to see what else has been done or undone.
Bob |
Sierraz71
New member
Username: Sierraz71
Post Number: 4
Registered: 9-2005
| | Posted on Thursday, September 29, 2005 - 2:53 am: |
|
Tonite I did the voltage adjustment for the pll, it was out a bit. then tuned the slugs, the ssb improved a bit, the am did not, it was ok.
The freq counter still not working. More work to be done, but I can use it now.
I did notice that the rig does throw some heat,it seems that it could use a small fan to circulate air. A very small fan from the interior of a computer works great, the ones that are on the cpu, not the larger pwr supply fans, lok for the 12v fans. |
Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 718
Registered: 9-2004
| | Posted on Thursday, September 29, 2005 - 10:24 pm: |
|
i think thats a great idea.
ive actually been thinking about adding one to mine.
my transformer does get warm after a while, but i think thats a symptom of age.
for the best results, get a 10amp power supply and use it to power the radio. (switch on the back)
if this is not an option for whatever reason, at least replace the filter capacitor for the power supply with a larger value one.
it is located on the bottom of the chassis with two wires going to it and held in by a bracket.
replace it with a 6800uf 50volt electrolytic capacitor. (5,000uf 35volt at the bare minimum)
this will give the power supply some "breathing room" for when you're pushing a lot of audio through the radio or running at a higher than stock dead key setting.
did the freq. counter ever read out anything other than the 92.???? while you were adjusting the VCO?
matt |
Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 719
Registered: 9-2004
| | Posted on Thursday, September 29, 2005 - 10:26 pm: |
|
BTW, you tune the slugs in SSB mode, but they affect all modes, so you did make an improvement to the AM also. |
|
