In article ,
Gary Schafer wrote:

What's wrong with 1 ppm?

Regards
Gary

1 PPM is 1 Hz/Mhz Figure at 26 Mhz your now at 26 Hz plus or minus
Now the spec for modern MF/HF SSB Commercial Radios is +/- 20 Hz, so
you out of tolerence on frequency.
Not good enough to meet current Type Acceptance Spec's.....


Bruce in alaska
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On Thu, 10 Feb 2005 19:16:23 GMT, Bruce in Alaska
wrote:

In article ,
Gary Schafer wrote:

What's wrong with 1 ppm?

Regards
Gary

1 PPM is 1 Hz/Mhz Figure at 26 Mhz your now at 26 Hz plus or minus
Now the spec for modern MF/HF SSB Commercial Radios is +/- 20 Hz, so
you out of tolerence on frequency.
Not good enough to meet current Type Acceptance Spec's.....


Bruce in alaska


Hi Bruce,

Yes I understand the spec. But as far back as I can remember ssb being
used for marine applications the spec has been +- 20 hz. That was even
before synthesizers came to the market.

So I would guess that if the radio was specked at 1 ppm that it
probably did not cover anything above 20 mhz?? Probably only covered
through 16 mhz?

Regards
Gary

In article ,
Gary Schafer wrote:

Hi Bruce,

Yes I understand the spec. But as far back as I can remember ssb being
used for marine applications the spec has been +- 20 hz. That was even
before synthesizers came to the market.

So I would guess that if the radio was specked at 1 ppm that it
probably did not cover anything above 20 mhz?? Probably only covered
through 16 mhz?

Regards
Gary

I can't think of one player in the Marine Radio Market that built
good MF/HF Radios that didn't go to 22Mhz. This was before they had the
26 Mhz Marine Band. Oh, there were a bunch of minor players with
radio's that topped out at 8 Mhz but none of the Biggies ever built
one. Back then, there was only Northen Radio, Motorola, and Intech in
the US, and Icom was just entering the market. Sailor was one of the
few Euro radio's that came to the US. All of them went to 22 Mhz.
The older spec for Marine MF/HF was +/- 50 Hz, and if you want a
Part87 Type Acceptance for a Base Station, it is +/- 10Hz. That
was really hard spec to make with crystals. Northern did it with a
very special Crystal Oven on their N550 Radio's, but it wasn't easy.

Bruce in alaska
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