JR does have one double-conversion rx, the R940 D/C (stands for double
conversion -- costs 200 bux). The rest of them have some AGC circuitry
and extra filtering which make the rx perform well in every respect
except image rejection. Image rejection doesn't matter on 72 mhz
because there's nothing transmitting on the image frequency, except for
ch 11 (I think it's 11), so they don't supply their single-conversion
rxs with that crystal; but on 6 meters you never know what might be on
the image frequency, so you gotta go with double conversion.
--- Tom Watson <[EMAIL PROTECTED]> wrote:
> The Horizon catalog doesn't have many details on the 700, but I
> believe JR
> stuff is single-conversion with their proprietary filtering system,
> which
> supposedly yields dual-conversion like performance. This has not,
> however,
> been my experience (at least on the channels I fly). Your mileage
> may vary.
>
> Tom
>
> ----- Original Message -----
> From: "Len Revelle" <[EMAIL PROTECTED]>
> To: "tony estep" <[EMAIL PROTECTED]>; "James V. Bacus"
> <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Sent: Saturday, July 07, 2001 11:19 AM
> Subject: RE: [RCSE] JR R700 rx
>
>
> > Their ads says the 700 is to replace the 600. Though I've not been
> able to
> > find specs on the 700 would it not be safe to assume at least
> double
> > conversion?
>
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