[Rover] Yaesu FT-847- further information

Sat, 1 Jun 2002 22:52:48 -0500

With regard to the FT-847 it does NOT have "individual band selected control
signals for 6 through 0.7 meters". Rather it has individual "standby"
signals for each of these bands which are a logical AND of TX and band
selected. These four signals are intended to be used for hard keying
external VHF/UHF amplifiers but, they won't work for controlling external
antenna relays (such as you might use between the outputs of multiple
amplifiers and a common shared coax up your tower).  The reason that they
won't work for controlling external antenna relays is that the "standby"
signals are only active during TX and therefore wouldn't activate antenna
relays during receive (note that this problem also exists with the new
Kenwood 2000).

I should have mentioned that the FT-100 does have an internal option that
allows you to use the antenna tuner output for sensing the internal band
selected information. By replugging this cable internally, you can read the
encoded band selected information including the VHF/UHF bands. You would
then have to decode them and provide relay drivers to your external relays
and also AND together these and TX to provide hard keying to external
VHF/UHF amplifiers.

73, Jim, K0MHC/R
Lake Miltona, MN EN26ha

> >  meters"
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Thursday, May 30, 2002 8:42 AM
Subject: Re: [Rover] Yaesu FT-847

> In a message dated 5/30/2002 9:27:03 AM Eastern Daylight Time,
> [email protected] writes:
>
> > One common problem on all of these potential mobile/rover/base station
rigs
> >  is the lack of individual band selected control signals for 6 through
0.7
> >  meters. This limits your ability to control external antenna relays.
>
> One correction, the 847 has individual control lines for 6, 2 and 432.
>
> 73,
> Mike, N1JEZ/R
> In a previous life, N1MJD/R
> "A closed mouth gathers no feet."
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