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Accidental Attenuator

 

I'm using the RT systems FT-817 memory management software. This allows you to enter channel information - frequency, mode, etc - directly into your computer and then send the resulting frequency list to your FT-817. But whenever I program HF-SSB channels and send them to the radio, the attenuator gets switched on in the process.

As far as I can tell, the software has no documented control over the attenuator setting, but something is causing it to change within the radio. Has anyone else experienced this, and if so, have you found a way to prevent it?

Thanks...
Brian Frobisher
 

I just forwarded a copy of you letter to RT systems asking them to investigate and fix if need be. And to send me the upgraded version.

----- Original Message -----
From: thomas4174@...
To: FT817@...
Sent: Saturday, July 07, 2001 1:13 PM
Subject: [FT817] Accidental Attenuator


I'm using the RT systems FT-817 memory management software. This allows you to enter channel information - frequency, mode, etc - directly into your computer and then send the resulting frequency list to your FT-817. But whenever I program HF-SSB channels and send them to the radio, the attenuator gets switched on in the process.

As far as I can tell, the software has no documented control over the attenuator setting, but something is causing it to change within the radio. Has anyone else experienced this, and if so, have you found a way to prevent it?

Thanks...



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--- In FT817@y..., "Brian Frobisher" <froby@e...> wrote:
I just forwarded a copy of you letter to RT systems asking them to investigate and fix if need be. And to send me the upgraded version.
Thanks Brian...

I e-mailed them over a week ago but so far have not got a response.
[email protected]
 

Hi,

While I don't have the RT Systems software, I can at least tell you
what is probably happening - and maybe you can tell them and they can
fix it.

It *is* actually possible to adjust the Attenuator, IPO, AGC, power,
radio version, etc. setting via the serial port, but in short, what is
happening is that bit 4 of the 3rd byte of the memory associated with
what you are writing (i.e. memory number, or the memory associated
with the current band/VFO) is being inadvertently set and the
Attenuator is being activated(i.e. the 3rd byte also selects the
CTSSS/DCS tone mode, and IPO.)

(Programming the radio via the serial port is discussed in some depth
at:

Please read and understand the warnings before you do anything.)

73,

Clint
KA7OEI


--- In FT817@y..., thomas4174@y... wrote:
As far as I can tell, the software has no documented control over
the attenuator setting, but something is causing it to change within
the radio. Has anyone else experienced this, and if so, have you found
a way to prevent it?

Thanks...
 

It *is* actually possible to adjust the Attenuator, IPO, AGC, power,
radio version, etc. setting via the serial port, but in short, what is
happening is that bit 4 of the 3rd byte of the memory associated with
what you are writing (i.e. memory number, or the memory associated
with the current band/VFO) is being inadvertently set and the
Attenuator is being activated(i.e. the 3rd byte also selects the
CTSSS/DCS tone mode, and IPO.)
Right! Actually I stumbled on your page earlier and downloaded the whole thing intending to put it forever onto a CD I'm making of all my FT-817 reference material. So now I see how the attenuator can be controlled. I guess the ball is in RT Systems' court now. THANKS for the valuable help!

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