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Message |
    
Snapperhead
Intermediate Member
Username: Snapperhead
Post Number: 189
Registered: 2-2002
| | Posted on Tuesday, February 22, 2005 - 8:05 pm: | 
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Hey guys, I asked this question on the Open Forum and didn't get any results........Maybe I posted it in the wrong section...I have a Older style 148gtl that I want to wire a Cobra 2000 split clarifier to.......Clarifier is already Unlocked. What kind of wiring do I need to do, to get the dual 2000 knob to work .......Thanks |
Racer_x
Junior Member
Username: Racer_x
Post Number: 29
Registered: 2-2005
| | Posted on Wednesday, February 23, 2005 - 9:38 pm: |
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Snapperhead - What are you trying to do? Replace the single pot on the 148 with the dual clarifier of the 2000 that has a coarse and a fine, or are you trying to make a split clarifier that changes the transmit and receive independantly? |
Mrbigshot
Junior Member
Username: Mrbigshot
Post Number: 21
Registered: 2-2005
| | Posted on Thursday, February 24, 2005 - 8:58 am: |
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why not just lock the clairifier back up and use a spst mini switch and hook up a 10k switch |
Snapperhead
Intermediate Member
Username: Snapperhead
Post Number: 190
Registered: 2-2002
| | Posted on Thursday, February 24, 2005 - 9:04 am: |
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Hey Racer X, Yes I want to wire up Dual clarifier from Cobra 2000 to my Cobra 148 gtl......Clarifier "Unlock" mod is done....Just was wondering if I could have both fine and coarse wired up for RX and TX.........Thanks |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 231
Registered: 9-2004
| | Posted on Thursday, February 24, 2005 - 10:22 pm: |
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not to be obtuse, but, where did you get the dual calrifier control? are you taking parts out of a 2000gtl? my guess is that the 148gtl board doesnt have the capabitity to add a fine control. i could be wrong though. if youre looking for a finer slide, maybe you can just change the impedence of the pot thats in there now. in that radio there is a diode that you can add a 5.6mh choke to for more slide. maybe you can add this thru a switch for a dual clarifier effect. sorry im not more help.
matt |
Snapperhead
Intermediate Member
Username: Snapperhead
Post Number: 193
Registered: 2-2002
| | Posted on Thursday, February 24, 2005 - 10:44 pm: |
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Hey Matt, actually my friend a while back took his split pot off of his rig and added a 20k ten turn, which then he gave me the part.......It's sat for a while in my tackle box of parts.....I thought it would be kinda cool to have a split clarifier in a 148gtl. It does have the room to fit ok.........73's |
Skip_shooter
New member
Username: Skip_shooter
Post Number: 3
Registered: 2-2005
| | Posted on Thursday, February 24, 2005 - 11:01 pm: |
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well the radios are the same boards and it will work but you may have to re aline the radio you just ned to find a good tech |
Racer_x
Junior Member
Username: Racer_x
Post Number: 35
Registered: 2-2005
| | Posted on Friday, February 25, 2005 - 7:48 am: |
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Snapperhead - I still don't understand what you're asking. Do you want to just substitute the dual pot for the one that's currently there, or do you want to have one pot for TX and one for RX? |
Racer_x
Junior Member
Username: Racer_x
Post Number: 39
Registered: 2-2005
| | Posted on Friday, February 25, 2005 - 8:54 am: |
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Kid vicious - The clarifier control is a potentiometer which varies resistance. The board has nothing to do with a dual pot clarifier - the two pots are just wired in series with each other. The coarse is a larger value and tunes a greater range, and the fine is a smaller value which tunes a smaller range.
Mrbigshot - I'm guessing you're not a SSBer. 10K is an entire channel. Clarifiers usually tune maybe 2KHz in stock form. They're used to get the frequency perfect on SSB so the pitch is correct and you can understand what the other party is saying. Unlocked clarifiers are almost a necessity if more than two operators are chatting. Clarifying more than one person as you listen to them speak is just about impossible. |
Scrapiron63
Advanced Member
Username: Scrapiron63
Post Number: 763
Registered: 12-2001
| | Posted on Friday, February 25, 2005 - 12:34 pm: |
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"Unlocked clarifiers are almost a necessity if more than two operators are chatting. Clarifying more than one person as you listen to them speak is just about impossible."
RacerX, You said a mouth full there. I've been preaching that for years. Locked clarifiers are fine for one on one talking but if your having a roundtable and want people to sound like they should, you need unlocked clarifiers. |
Mrbigshot
Junior Member
Username: Mrbigshot
Post Number: 27
Registered: 2-2005
| | Posted on Friday, February 25, 2005 - 2:20 pm: |
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unlocked clairifers ive ever used were for able channels. thats what i though he was doing with it. no i dont like to ssb to much. |
Snapperhead
Intermediate Member
Username: Snapperhead
Post Number: 194
Registered: 2-2002
| | Posted on Friday, February 25, 2005 - 8:10 pm: |
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Hey guys, I just wanted to try something different. I always try to unlock my Clarifier on my CB SSB rigs...My 2950 I still have locked, but it's nice with the shift button on face for fine tuning.....I like it for, like thread above, when you have multi QSO's going.......Plus going 5kc's down on freq when the beehive starts rolling....I have the split clarifier wired in right now, but I'm only using the coarse tune on the pot......I'm not sure if I should jump to the same 3 solder tabs from the fine to coarse or what......It's about 7kc's down and 5 up right now......I really want to put a 20k 5 turn pot in, but I don't know where to buy one that will fit in the 148gtl without complications.....I wired a 20k 10turn pot in my 2000 years ago, but had lots of room.......Thanks for the insight Ya'll.......73's |
Tech808
Moderator
Username: Tech808
Post Number: 5011
Registered: 8-2002
| | Posted on Friday, February 25, 2005 - 11:56 pm: |
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Just my personal experience over the years but I have never found that I needed an unlocked clarifier on any radio.
I get Dead on Frequency and I do NOT Change it or tune to anyone.
On the Sunday CEF Nets I have had no problems and when talking with 6 different people all CEF members and all of us talking with Shady CEF #463 in FL the other night and the other members in different states I never had to move the clarifier and had no problems.
I guess I can understand it if your radio will not stay on frequency and you have to constantly tune to others but if your radio is DEAD ON then I see no reason for it.
Just my personal experience,
Lon
Tech808
CEF808
N9OSN
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Racer_x
Junior Member
Username: Racer_x
Post Number: 41
Registered: 2-2005
| | Posted on Saturday, February 26, 2005 - 9:57 am: |
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Snapperhead - I've never actually modified a clarifier on a 148 so I can't tell you exactly what to do, but I can tell you what to look for and then do. Since you already have it working on the coarse pot it'll be pretty easy.
There should be a wire going from the coarse pot to pin 3 of an MB3756 IC for +8v or somewhere else for a constant voltage of at least +8v. From what I read, this is usually an orange wire. Take note of which pin this wire connects to the coarse pot.
There should be a wire going from the center pin of the clarifier pot back to the board. Move the wire from the center pin of the coarse pot to the center pin of the fine pot.
Solder a wire from the center pin of the coarse pot to the pin on the fine pot that is on the same side as the pin on the coarse pot I asked you to take not of earlier. It's the one that connects to +8v or other constant voltage.
The other pins of both the coarse and fine pots should be wired to a circuit ground. If they aren't you can solder them to a tuning can that is close.
That should do it. Let me know how it works.
If the clarifier has been modified to swing a great deal I can understand why someone would need a multi-turn pot, but I like the coarse/fine idea better.
I'm sorry I didn't understand what you wanted to do right away, but some folks do a split clarifier mod where the coarse controls the receive and the fine controls the transmit. You were using the word split and I was confused. |
Racer_x
Junior Member
Username: Racer_x
Post Number: 42
Registered: 2-2005
| | Posted on Saturday, February 26, 2005 - 10:16 am: |
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Lon - Either you must not mind folks being off frequency or everyone else tuned to you, because the odds of 6 people having radios exactly on frequency is astronomical.
I can easily tolerate a difference of 50Hz, but more than 100Hz drives me nuts. I prefer to have folks on frequency so they sound like they do on AM or FM. |
Tech808
Moderator
Username: Tech808
Post Number: 5022
Registered: 8-2002
| | Posted on Saturday, February 26, 2005 - 10:40 am: |
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Racer_x,
You are correct they tune to me.
You should sign up and join the CEF Radio Club and come join us on Sundays and everynite through the week.
You will find we can have 6 and more on talking and I NEVER adjust the clarifier.
We have roughy 25 CEF Radio Club Members within 30 miles here and we can have 6 to 12 of us on the Sunday Nets and thru the week all talking and once everyone is set on frequency and NO PROBLEMS.
I am like Tech833 if the person I am talking with is Off frequency I will tell them.
Gererally 4 out of 7 nights we can always hit Shady in FL on AM or LSB most every nite on 13/27.115
Sign up for the CEF Radio Club and come join us for some FUN!
Lon
Tech808
CEF808
N9OSN |
Scrapiron63
Advanced Member
Username: Scrapiron63
Post Number: 765
Registered: 12-2001
| | Posted on Saturday, February 26, 2005 - 11:18 am: |
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Lon, I believe most of the radios you use are what I call unlocked. By that I mean either a clarifier or vfo that allows moving off center slot. The rangers have the shift that moves 100 counts per click, and the magnums and galaxy types have clarifiers that moved tx and rx. Of course mostly staying on the same channel, you can stay in the same spot and let them tune you. If you were going to other frequencies and hear a conversation that's a hundred counts or more off center and wanted to join them, hadn't you rather put your tx and rx where they are since they're already together and not make the whole group move to your spot. I know it would be nice if all radios were in the same spot on frequency on each channel, but in the real world it doesn't work like that. That's how I see it anyway. Scrapiron |
