Hi Newt,
Sounds like you've got it nailed.? Congratulations.
A 'scope is a real handy thing to have around; I'm sure you'll get a lot of use out of it.
73,
ed - k9ew
On Wed, Jun 9, 2010 at 7:59 PM, Newton White
<k0nwt@...> wrote:
?
?
Hi Ed,
?
I am finally getting back to this as life, work, etc. has a habit of
interfering with other fun at times. I went back and did a better job of
matching the rf out to a good 50 ohm load. After that I decided to listen again
through my receiver. I do have a decent bench top power supply that I recently
acquired. I set it to 6.0 V and limited the current to 0.20 A. I heard my call
again at 12 wpm, and then listened carefully for about 20-25 seconds and heard
the very slight freq. shift for about 12 seconds after which it shifted again. I
am positive it is working correctly now.
?
The next step is to start the Argo grabber and figure out the kits
operating frequency and also the shift. I did acquire an Oscilloscope this past
weekend at the Atlanta Hamfest from Mr. Garcia, but I now need a crash course in
it's proper operation before I can make good use of it. It's an older 100 MHz
made by Kikusui - I was able to see a sine wave at around 10 MHz when probing
the kit - I just need to see how to get an exact reading.
?
I will put the kit in a plastic box with 4 D-cells and attach to a tuned 30
M wire dipole hopefully by the weekend - I will post the operating freq. on
?
Thanks for the suggestions!
?
k0nwt
Newt
----- Original Message -----
Sent: Monday, June 07, 2010 09:21
Subject: Re: [QRPLabs] Re: QRS kit
quesion from Newby kitter
?
Hi Newt,
You say the carrier is keyed up after your call is sent at
12wpm, but then just hangs.? Here are some things to
check:
1)? If you listen to the carrier on your receiver, do you
hear a very slight shift in frequency occasionally (it should change frequency
by a few *cycles* whenever the voltage on pin 3 of IC1 changes)?? If you
can hear that frequency shift, it's working.
2)? If you don't hear
that, measure the voltage on pin 3 of IC1 with a DVM (black lead to
ground).? It should be toggling occasionally from 0 to 5V.? (You
*are* using a 5-6V supply, right?)
3)? Make sure the twisted wires
on C3 aren't shorted together.? (If they were shorted, you would see the
signal voltage on pin 3 of IC1 on L1.)
4)? Check all your solder
connections while you're at it; it only takes one bad connection to ruin your
day.
5)? Check the voltage on the "Q3 side" of R6.? It should
be between 0 and supply voltage.
6)? Check the voltage on the "Q3
side" of L2.? It should be a little bit lower than the supply
voltage.
7)? Do you have an oscilloscope?
Report back to us
what you've found.
73,
ed - k9ew
