amastron
Big Bucket Mouth
Don't take life too seriously; No one gets out alive!
Posts: 86
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Post by amastron on Dec 22, 2008 13:22:50 GMT -5
I have been given a PAL Model # 1B (red sticker on rear) VFO and I need to know if this thing will work on my radio. First of all I know nothing about VFO's so I may ask for some help in that area as well. I have a Browning Golden Eagle Mark III AM/SSB. It has a RCA plug mounted in the rear of the transmitter and the coax from it runs to Ch.9. Thanks!  |
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Post by FIXR on Dec 22, 2008 22:24:36 GMT -5
Is it 1B or B1? Can you read the frequency on the crystal on the inside?
Fixr
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amastron
Big Bucket Mouth
Don't take life too seriously; No one gets out alive!
Posts: 86
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Post by amastron on Dec 22, 2008 22:59:38 GMT -5
Thanks for the reply fixr,
On the label it is1B, It looks like PAL placed this label there.
It says, "PAL VFO" up top. Right under that it says "Model # and on the line provided someone has wrote "1B" in ink.
Under that it says "Do not remove this sticker".
The xtal inside this thing is BIG and it says it's 6.705 MC
amastron
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Post by FIXR on Dec 22, 2008 23:28:40 GMT -5
Amastron,
It would be for a radio with an 11 Mc synthesizer then. The PAL VFO's add approximately 5 Mc's to the crystal frequency in the VFO. A Browning MKIII needs a VFO with 16 Mc output.
Fixr
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amastron
Big Bucket Mouth
Don't take life too seriously; No one gets out alive!
Posts: 86
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Post by amastron on Dec 22, 2008 23:44:15 GMT -5
It's 11 and PAL adds 5 so wouldn't that b 16?
So this thing has no use and won't work on my radio?
It was given to me so at least I didn't lose anything.
Thanks for the help with this thing Fixr...
amastron
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Post by 2600 on Dec 23, 2008 1:35:08 GMT -5
The Pal's 5 MHz internal VFO frequency added to a 6 MHz crystal will get you approx 11 MHz out of the slider.
Changing it to a 11 MHz crystal adds up to 16 MHz, but would not do the whole job of converting it.
The crystal oscillator has a tuned circuit that has to match the crystal frequency.
The mixer stage that puts the two frequencies together must also be retuned from 11 MHz to 16, as well as the tuned circuit in the output stage.
Too bad nobody has ever published a step-by-step "how-to" for converting a Pal.
But the crystal is just the beginning of that process.
73
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amastron
Big Bucket Mouth
Don't take life too seriously; No one gets out alive!
Posts: 86
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Post by amastron on Dec 23, 2008 17:07:13 GMT -5
How about a 27.3 Mhz Maco Slider on the same radio, will it work?
amastron
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Post by 2600 on Dec 23, 2008 23:44:38 GMT -5
Won't work on a Mark III SSB transmitter. That one needs 16.27 MHz fed into it to get you onto channel 1.
The 27.3 Maco is meant to be used with older AM-only transmitters that used one crystal for each transmit channel, like the Browning AM-only transmitters.
SSB transmitters are not a match for that slider.
73
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