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Post by Raccoon on Nov 21, 2022 12:00:53 GMT -5
I've mentioned in the past that I have a PAL VCO ... it's the D5 model . I'm not finding a lot of information about them online, or much of anything about hooking them up in a radio . So I figured I'd ask a question here and see what I can find out . I have three 23 channel base stations , and I'd like to try this out with at least one of them , but I'm not sure if I can , and if I can ... which crystal is supposed to be removed in order to use it ?
The base stations are :
1. Kris 23 +
2. Lafayette Comstat 23 (the original model)
3. Pearce Simpson Bengal
any help/information would be greatly appreciated ... and thank you in advance .
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Post by cbrown on Nov 23, 2022 12:48:24 GMT -5
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Post by cbrown on Nov 23, 2022 12:52:16 GMT -5
I've mentioned in the past that I have a PAL VCO ... it's the D5 model . I'm not finding a lot of information about them online, or much of anything about hooking them up in a radio . So I figured I'd ask a question here and see what I can find out . I have three 23 channel base stations , and I'd like to try this out with at least one of them , but I'm not sure if I can , and if I can ... which crystal is supposed to be removed in order to use it ? The base stations are : 1. Kris 23 + 2. Lafayette Comstat 23 (the original model) 3. Pearce Simpson Bengal The Kris 23+ I don't see on the list, the Lafayette Comstat 23 original model uses the B-4 model and the Pearce Simpson Bengal uses the A-7 model. |
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Post by crazybob on Jan 23, 2023 21:36:22 GMT -5
The Kris 23 tube set, uses the same VFO as the Lafayette Comstat 25B, & most Panosonic tube radios. Chanell one is 23.290.
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Post by 3pinplug on Jan 24, 2023 2:47:57 GMT -5
Hi
There is some info on these on CB Tricks, when screen loads look down lefthand side and it mentions VFO, select then when next screen appears select pal and theres 3,listed, hope that helps.
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Post by cbrown on Jan 25, 2023 14:10:53 GMT -5
The Kris 23 tube set, uses the same VFO as the Lafayette Comstat 25B, & most Panosonic tube radios. Chanell one is 23.290. If that is the case, then the PAL required for the Kris 23+ would be the C-1, but that shows it replacing a 23.440 MHz crystal. |
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Post by 2600 on Jan 26, 2023 1:11:27 GMT -5
I acquired the habit of pulling the cover from a PAL VFO and reading the crystal markings. This many years down the line it seems like more than half the VFOs out there have been diddled to alter the coverage some time in the last four decades. Markings on the rear panel may or may not tell you a thing about what frequency actually comes out that RCA jack.
As a general thing just adding 5 MHz to the crystal frequency gets you the output frequency on channel 1. For higher frequencies the crystal may be running at an overtone about three times the marked frequency. A counter and a patch cord from the PAL's output jack to a counter is your best friend. A 'scope to see that the drive level isn't crippled can be handy.
And if someone has abused the insides in a conversion attempt, this is the only way to find out.
Now and again we see one that has had the crystal changed from the original. If it was properly converted, the output level should be good. And if the only thing that was done was to sub the crystal, there probably won't be any output. The three coils and their trimmer caps have to agree with the crystal, or nothing comes out at all.
73
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Post by cbrown on Feb 1, 2023 12:51:06 GMT -5
I acquired the habit of pulling the cover from a PAL VFO and reading the crystal markings. This many years down the line it seems like more than half the VFOs out there have been diddled to alter the coverage some time in the last four decades. Markings on the rear panel may or may not tell you a thing about what frequency actually comes out that RCA jack. 73 I ran into the same thing when I was restoring some Siltronix VFOs, too. Great advice! |
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