starman ) writes:

The Panasonic RF-3100 used a 'semi-synthesizer' design which generated
the MHZ ranges and combined these with conventional analog tuning within
each MHZ range.

But I don't see why you'd call that a "semi-synthesizer". If it's like
what's in the Galaxy and the HRO-500, it's a real synthesizer, but what
it is synthesizing is all the crystals 500KHz or 1MHz apart that are
needed for the first local oscillator. In something like the Collins R-390,
they have those crystals, but they can add up and take up space.

The fact that there is a tuneable oscillator to cover the 500 or 1000KHz
range does not make it any less of a synthesizer. It's merely not completely
digital tuning.


Michael

Michael Black wrote:

starman ) writes:

The Panasonic RF-3100 used a 'semi-synthesizer' design which generated
the MHZ ranges and combined these with conventional analog tuning within
each MHZ range.

But I don't see why you'd call that a "semi-synthesizer". If it's like
what's in the Galaxy and the HRO-500, it's a real synthesizer, but what
it is synthesizing is all the crystals 500KHz or 1MHz apart that are
needed for the first local oscillator. In something like the Collins R-390,
they have those crystals, but they can add up and take up space.

The fact that there is a tuneable oscillator to cover the 500 or 1000KHz
range does not make it any less of a synthesizer. It's merely not completely
digital tuning.

It was called 'semi-synthesized' because as you say, it was not fully
digital.


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Brian Hill wrote in message
...
I just bought these two off Ebay and was wondering if anybody has any
experience with these two radios. I bought em both for obvious collector
reasons. The R-530 has the Wadley loop circuit which I'm interested in.
And
I got the SW1 because it's one of the first micro portables with descent
performance and I collect Sony's. I would like to find the Original Barlow
Wadley XCR-30 someday.

Brian:

The Sony SW1 is an excellent performer for its size. I took mine the world
over and it served me just fine. There is a problem which plagues the
little receiver and that is the decoupling capacitor in the audio
amplifer---they need changing. Nearly every SW1 that I know of (including
mine) required replacement of those capacitors---and the job is not for the
faint of heart. The radio will play just fine with earbuds but with speaker
it just makes a loud buzz.

I wrote a detailed service note that I posted to this newsgroup about two or
three years ago---do a search under SW1 and RadioGuy and I think you will
find it.

RG

"RadioGuy" wrote in message
...

Brian Hill wrote in message
...
I just bought these two off Ebay and was wondering if anybody has any
experience with these two radios. I bought em both for obvious collector
reasons. The R-530 has the Wadley loop circuit which I'm interested in.
And
I got the SW1 because it's one of the first micro portables with descent
performance and I collect Sony's. I would like to find the Original
Barlow
Wadley XCR-30 someday.

Brian:

The Sony SW1 is an excellent performer for its size. I took mine the
world
over and it served me just fine. There is a problem which plagues the
little receiver and that is the decoupling capacitor in the audio
amplifer---they need changing. Nearly every SW1 that I know of (including
mine) required replacement of those capacitors---and the job is not for
the
faint of heart. The radio will play just fine with earbuds but with
speaker
it just makes a loud buzz.

I wrote a detailed service note that I posted to this newsgroup about two
or
three years ago---do a search under SW1 and RadioGuy and I think you will
find it.

RG



Hi RG. Yes I've saved your service notes. I think a lot of the early Sony's
had cap problems. I've fixed two Pro80s that had cap problems too. Thanks

B.H.