[Lowfer] " XR " WSPR

[Douglas D. Williams]

No problem at all, Andy. It was fun installing the software this
morning and seeing your signal pop up before I even read the
instructions. ;-)

D. KB4OER

On Sun, Dec 5, 2010 at 2:24 PM, Andy - KU4XR <ku4xr at yahoo.com> wrote:
> Hi all:  First; Thanks to Lloyd, Jay, and Laurence for looking
> for the WSPR signal. My best guesstimate for power output right
> now is about 500 Milliwatts on the air. I am running completely
> Class " AB " at the moment; but it's the only thing that will
> work.. I tried to run the radios output thru the Class " D " amp,
> and for whatever reason; that's unknown to me, it would not
> show any output over about 50 Milliamps of RF. The drive from
> the radio itself feeding straight into the 50 Ohm LPF into the
> matching coil was higher than that. So I tried the TDA7052B,
> and got a respectable output level. The RF current continues to
> rise as the ground dries from Sat's. rain and is up to 115 mA.
> For the 1 watt in Class " AB " 125 mA will be the max on RF " I "
>
> For a good dose of laughter, here is the setup that gives best
> performance so far. The TDA7052B is a BTL amp, and trying to run
> it single ended never gave much output, so I connected a small
> 8 Ohm speaker to its terminals, and am tapping output from the
> speaker terminal that gives the best output into the 50 Ohm LPF.
> I tried bypassing the LPF, but the output is better thru it.
> I'm sure that if I had a filter designed with an 8 Ohm input,
> to a 50 Ohm output, that would be even better.. I am feeding the
> radio thru a .3 µF cap into the amplifier input. The drive level
> is MUCH too high. I have everything backed down to almost off,
> to keep from driving the audio amp out of its mind... Again;
> this is a crude, throwed together setup to get on the air.
>
> If I'm thinking correctly; I really need to put a squaring
> circuit in the line so that it will " hopefully " drive the
> Class " D " amp.
>
> Doug: Thank you for tieing up your equipment.. You have shown
> as Jay mentioned that it is working.. Your spots on the
> database give me a feeling of accomplishment.. I can finally
> say that I have successfully ran a digital signal, copyable
> past my driveway, on 1750 meters. I really appreciate your time.
>
> Until I can do better;  73 to all for now:
>
>
> Andy - KU4XR - EM75xr - Friendsville, TN. USA
>
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