Wb4mak es I are at ham radio 2010 in friedrichaffen. Will look for u all.
W4QO Jim Stafford www.w4qo.com QRP - When you care enough to send the very least!
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--- On Wed, 6/23/10, Mike <mikeberg@...> wrote:
From: Mike <mikeberg@...>
Subject: [QRPLabs] Re: Hans Summer's web page 30m transmitter
To: QRPLabs@...
Date: Wednesday, June 23, 2010, 11:06 AM
?
Thanks Hans,
I figured I might experiment with that design until
you're able to start shipping kits.
73 Mike N0QBH
--- In QRPLabs@...,
"hanssummers2000" <hans.summers@...> wrote:
Hi Mike
Can anyone tell me the values of the voltage
divider resistors biasing LED varicap in the schematic on
this page?
I think the upper resistor is 33k but have no
clue what the grounded one is.
Even I can't tell you that, sorry :-( Looks like
I shrunk that diagram too much. The good news is that the
values are entirely non critical. You could try with 33k in
both positions to start with. I believe I chose the values
in haste. It was merely to achieve, together with the 100K
resistor to the 4-bit digital-to-analogue converter, the
right amount of shift that I wanted. No magic to it. I think
it's just a matter of playing with the values until you
get the shift amount you want, subject to the component
tolerances and LED characteristics you have in your
circuit.
73 Hans G0UPL
