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Post by 238 on Oct 19, 2009 13:23:46 GMT -5
Just traded for a 2000. I noticed if i key it down & move the voice locks it moves the transmit. Is it suppose to move the transmit fq? 238
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Post by BionicChicken on Oct 19, 2009 18:28:35 GMT -5
Just traded for a 2000. I noticed if i key it down & move the voice locks it moves the transmit. Is it suppose to move the transmit fq? 238 That is typical when the clarifier has been unlocked. As long and transmit and receive track with one another it is not a problem...........but if they don't..............it can be a PITA. |
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Post by Deleted on Oct 19, 2009 21:12:18 GMT -5
That is the way it should be. If the clarifier is not unlocked, you will sound off frequency in most cases, after you tune tham in. A 3 way conversion would be impossible. Leave it as is.
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Post by cbrown on Oct 20, 2009 13:26:50 GMT -5
I'm not a big believer in having the clarifier unlocked on a channeled radio.
If you unlock the clarifier on your radio, that means that every time you adjust the clarifier to dial in a station you are also changing the frequency that you are transmitting on. As you are talking to that station others are dialing you in so they can understand what you are saying. So far so good, right? Now another station calls for you, and you dial them in. When you dialed them in your transmit frequency also changed. That means that everyone that previously dialed you in now has to dial you in again. And again and again every time you dial in a different station. Most people using won't bother with chasing you up and down the band. They'll just ignore you and talk to someone that is on frequency. When the clarifier is locked (as it is from the factory) your transmit frequency remains constant - even if you have to make a slight adjustment to dial a station into your receive. That means stations that previously dialed you in will still be able to understand you which equates to having a greater chance of someone responding.
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Post by Sniper..Unit 305 on Oct 20, 2009 15:47:45 GMT -5
When the clarifier is unlocked and you hear 2 or more different folks talking and can understand them all then your clarifier is tracking them on receive and transmit as long as they (receive and transmit) are in syc. Cannot see a problem with what you have and in my opinion it is the only way to go unless someone tells you that you are off frequency and you have them dialed in on your receive and you are hearing them IN frequency to you. I believe I am just repeating what BionicChicken and Alabama Tick have tried to explain to you. When your clarifier is set and locked from the factory to receive only, then having a 3 way conversation is nearly impossible if all 3 of you are transmitting ever so slightly different. You can clarify a 2 way conversation because you are claifying to that person and they are clarifying to you, but its just not likely for a 3 way. Don't think that I helped to CLARIFY this that much...lol..!! Sniper
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Post by Deleted on Oct 20, 2009 22:20:58 GMT -5
The unlocked clarifier is not neccessary if you have a VFO like a 2510. I was able to tune in stations with the VFO. That is impossible with a CB. All the CB might be only off by a 100-200 Hz, which will make SSB communication a nightmare. They are simply not stable or accurate enough to have a lock clarifier. I never understood why they did that.
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Post by mark on Oct 21, 2009 5:14:08 GMT -5
I agree about the unlocked clarifier not being a great idea! The best approach for a Cobra 2000 is to have the clarifier remain locked so you can use it like it was intended, as an "RIT". The solution to your problem is to get the radio PROPERLY ALIGNED by someone who knows what they are doing and whom also has regularly calibrated their test equipment. It is possible to put the 2000gtl right on, but must be done at operating temp only or it's a colossal waste of time.
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Sandbagger
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Post by Sandbagger on Oct 21, 2009 7:11:42 GMT -5
I agree about the unlocked clarifier not being a great idea! The best approach for a Cobra 2000 is to have the clarifier remain locked so you can use it like it was intended, as an "RIT". The solution to your problem is to get the radio PROPERLY ALIGNED by someone who knows what they are doing and whom also has regularly calibrated their test equipment. It is possible to put the 2000gtl right on, but must be done at operating temp only or it's a colossal waste of time. I have to respectfully disagree. Having your radio being "right on" is less impotant than being "right with eveyone else". And expecting a bunch of CB radios (none of which have crystal ovens or other means to increase frequency stability) to have their transmit frequency netted to the exact same place is a fool's errand. There will always be temperature drift, and measurement inaccuracies. The result is that radios with "locked" clarifiers will never be exactly on with each other, and once you go beyond a 2-way conversation, you will have to adjust the clarifier for each person for optimal audio fidelity. Been there and done that and after a while it becomes tedious. I guess it's less of a bother for those who don't care if the other guy sounds a little "Donald Duckish" or "Frogish", but I'm a stickler for tuning as close to "AM sound" as I can get. It's far better to give everyone the ability to net to each other by allowing their clarifiers to sync the receive with the transmit. Once everyone is tuned in, you're there. And it really doesn't matter if you're 200 or 300 hz high or low from center frequency, as long as everyone else is with you. Yes, there is a tendency for a large group to start "walking the clarifier", where someone starts adjusting and everyone else follows. But in my experience, that is less of a problem, than trying to deal with guys who can't move at all. |
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Post by 238 on Oct 28, 2009 17:29:11 GMT -5
Thanks all for all the info. I fixed the problem, i got rid of the radio. 238
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Post by Deleted on Oct 28, 2009 18:23:01 GMT -5
You got rid of the radio because it had a unlocked clarifier?
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Post by 238 on Oct 29, 2009 2:27:05 GMT -5
I did not like the fact that the transmit & recieve moved together. Was not the only reason. Used it in a trade for a AL80. 238
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Post by Deleted on Oct 29, 2009 8:22:48 GMT -5
You would like the HR-2510 then. With the VFO, you can keep the transmit locked, and still tune into within the conversion within 100Hz. CBs with SSB locked clarifiers are utterly useless. But you did seem to get a good deal.
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Post by Marc on Oct 29, 2009 10:03:58 GMT -5
Most people miss the point of unlocking the clarifier on the older radios. They were used mainly on am. they would be unlocked so a person could tune 10KHz down in freq. for access to the A(RC channels ) channels , like 27.195 10 down from Ch. 20 used to spend a lot of time there in the late 70,s an through to 80,s.
Also if not mistaken the 2000 ch.mod put all channels on odd freq. like 26.805 815 and so on there were lots of people that ran 26.800 and so on. you had to tune 5KHz down to get to them.
Marc
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Post by mark on Oct 29, 2009 10:22:21 GMT -5
I think you are right... This argument has been going on for decades... However, the guy that said he would rather have it unlocked so a bunch of guys can tune each other in is total malarkey. I say that because all these radios do not have a good enough frequency alignment/stability to have identical xmit/rcv freq. Especially after the magic diddle stick has been used inside them. The well meaning tech sets the unit at 75deg in his shop and the end user keeps the house at 85 or 50 and the frequency alignment is compromised... Some radios are good and this makes no difference, but others? Holy cow man!
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Post by cbrown on Oct 29, 2009 13:10:14 GMT -5
I did not like the fact that the transmit & recieve moved together. Was not the only reason. Used it in a trade for a AL80. 238 Nice amp. If the tube is good you should be happy. |
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Post by cbrown on Oct 29, 2009 13:19:28 GMT -5
Most people miss the point of unlocking the clarifier on the older radios. They were used mainly on am. they would be unlocked so a person could tune 10KHz down in freq. for access to the A(RC channels ) channels , like 27.195 10 down from Ch. 20 used to spend a lot of time there in the late 70,s an through to 80,s. On the old crystal controlled radios we used to just put in a crystal with a switch to get the 5 A channels (3,7,11,15 & 19) and the 1 B (22B) channel. 22A was already available in most radios, usually disabled by a small notch cut in the channel selector. Compared to the regular channels, those A & B channels were always quiet. And not a lot of people could get there.  |
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Post by crazybob on Oct 29, 2009 16:48:06 GMT -5
Yes! The old school "secret channels"!.. (I think I opened a few garage doors, back in the day.)
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Sandbagger
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Post by Sandbagger on Oct 29, 2009 18:10:14 GMT -5
Most people miss the point of unlocking the clarifier on the older radios. They were used mainly on am. they would be unlocked so a person could tune 10KHz down in freq. for access to the A(RC channels ) channels , like 27.195 10 down from Ch. 20 used to spend a lot of time there in the late 70,s an through to 80,s. Also if not mistaken the 2000 ch.mod put all channels on odd freq. like 26.805 815 and so on there were lots of people that ran 26.800 and so on. you had to tune 5KHz down to get to them. Marc Yea, but there is a difference between "unlocking" the clarifier and "expanding its range". In the former case you are simply correcting an FCC oversight and allowing the radio to do what they used to do back in the 23 channel days, and that's to simply move transmit and receive synchronously. Expanding the range does what you referrred to. On many varactor controlled radios, all that typically needed to be done was to jump one or two resistors or change the varactor for one with more range. On radios with a variable capacitor clarifier, typically putting an 8 or 10 uh choke in series with the tuning cap would usually give you a -10khz slide. And for the relative ease at which these mods could be done, you'd typically pick up 7 extra channels (The RC's, 22"B", and 1 below ch1). A pretty cost effective mod in those days. And those channels were just enough to get away from jammers and for a little extra privacy, or range. |
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Post by Sandbagger on Oct 29, 2009 18:17:46 GMT -5
Yes! The old school "secret channels"!.. (I think I opened a few garage doors, back in the day.)Funny story along those lines. I guess a lot of garage door openers ran on the class "C" RC channels back in the 60's and 70's. Back in '74 my friends and I used to run on channel 11. One of my friends had a neighbor who had one of those old style door openers. It must have been using channel 11A (27.095), and everytime he would talk the door would go up or down. Eventually the door opened half way and then stopped, the motor having burned out. The neighbor never figured out what was going on, and my friend didn't realize it either until after the fact when he put 2 and 2 together. Fortunately, the neighbor replaced the door opener with one that didn't use the CB band for the control frequency. |
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Post by cbrown on Oct 30, 2009 13:03:59 GMT -5
Back in '74 my friends and I used to run on channel 11. One of my friends had a neighbor who had one of those old style door openers. It must have been using channel 11A (27.095), and everytime he would talk the door would go up or down. Eventually the door opened half way and then stopped, the motor having burned out. The neighbor never figured out what was going on, and my friend didn't realize it either until after the fact when he put 2 and 2 together. Fortunately, the neighbor replaced the door opener with one that didn't use the CB band for the control frequency. I bet that was a sight to see, the door just going up and down "on it's own".  I know there were a few old car alarms that used the RC channels to arm/disarm too. |
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Post by zman on Dec 30, 2009 19:41:10 GMT -5
LOL!!!!!! One of my old Cb buds used to run a palomar 300A that would make his opener do that as well.
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I know there were a few old car alarms that used the RC channels to arm/disarm too.