[Lowfer] UWL station pics and measurements

[Eric Smith]

HI, Bill,

Well I had forgotten, but now that I mention it I DO remember your "TGIF"s
from years ago!!  Yes, you know I already knew all these straight forward DC
formulas -- that's not what I meant when I posted my final voltage and
current draw and said I needed help interpreting the results.  I already
knew that came to half a watt.

Thanks and glad to see you are still around!

You may remember that back when I first started operating UWL back in 2003 I
used an Epson programmable oscillator (a la the projects on Lyle's site) --
then I moved to a DDS exciter which I built from a design by Murray ZL1BPU.
I built a hybrid, really, between Murray's design and Lyle's bare-bones mod,
and used the firmware Murray provided.  This one worked great for 1750m and
2200m operation, but can't get to 600m.

So I built my own DDS exciter around an AD9851 dds chip and an ATmega1284p
microcontroller.  I also wrote all the programming for this one (in C) and
can't decide which I had more fun with -- the hardware design (which is
complete) or the software design (which I don't think is EVER _complete_!).
This one also uses one of the 12.8 MHz TCXOs Stuart gave away to good homes
a few years ago.

No, what I was asking for help on is WHY only half a watt at that voltage --
seems like when things are adjusted right I used to get much closer to
1-watt at that voltage.

Anyway, thanks for your reply -- I'm going to reply to Jay now on his
comments and questions which I think are just what I was looking for.

Oh and Bill -- what about that SVM???


Eric KD5UWL / WD2XFX



On Fri, Feb 11, 2011 at 8:38 PM, Bill Ashlock <ashlockw at hotmail.com> wrote:

>
> "Bill, please be nice :)"
>
> But it's Friday, Eric :) (Remember the good old days when the Fridays came
> around?)
>
> I think Jay covered the variometer details nicely but just in case you
> forgot: P = I x E.
> So your input power is only about half a gallon :)
>
> 73...
>
> Bill
>
>
>