Hi Sholto,
I just read the FT-450 Transmitter Specifications:
"Audio Response (SSB): Not more than -6dB from 400 to 2600Hz"
In my view that is not a very impressive specification
to begin with :) But, be that as it may, your measured
graph of transmit power vs audio frequency indicates
about 2
I must say that I agree with Bonnie - this is either a poor radio design or
more likely you've got a 'duff' radio.
I don't think the SignaLink is the problem.
Simon Brown, HB9DRV
www.ham-radio-deluxe.com
- Original Message -
From: "expeditionradio"
>
> It is not normal specifications
Hi Sholto,
It is not normal specifications to have 12dB tilt
(or more) within the passband of an SSB transmitter.
The engineer's response to your measured graph of
power vs passband frequency indicates that either
the engineer is BS'ing you, or the engineer is
unqualified to determine the pro
> Cortland
> KA5S
>
> > [Original Message]
> > From: Sholto Fisher <mailto:sholto%40probikekit.com>>
> > To: <mailto:digitalradio%40yahoogroups.com>>
> > Date: 1/8/2009 12:45:20 PM
> > Subject: Re: [digitalradio] Re: FT-450 on digimodes
&g
Cortland
KA5S
> [Original Message]
> From: Sholto Fisher
> To:
> Date: 1/8/2009 12:45:20 PM
> Subject: Re: [digitalradio] Re: FT-450 on digimodes
>
> Juergen,
>
> Thanks for doing the test.
>
> Now I am confused because I contacted Yaesu and sent them this gra
It's hard to believe that the engineer has looked at the scale ... If
such a characteristic would be standard I would not recommend the
YAESU FT-450 to be used for medium or wider digital modes like Olivia etc.
I remember that first tests of the FT-450 complained about poor tx
audio performance, b
Juergen,
Thanks for doing the test.
Now I am confused because I contacted Yaesu and sent them this graph of
my measured transmit passband:
http://www.projectsandparts.com/misc/ft-450tx.gif
And this is what the engineer told me:
"Your graph shows the typical audio roll off expected. The bass
I did a quick test only yesterday night at my FT-450 and here are the
results:
500 Hz40 W
1000 Hz40-50 W
1500 Hz40 W
2000 Hz40 - 50 W
2500 Hz20 W
There is not at all such a big difference for the different tones even
though it's for sure not a very even passband for the syste
