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A friend read this article and thought you would find it interesting
http://www.rfdesignline.com/shared/article/showArticle.jhtml?articleId=196701926
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Maybe he needs to set the display mode to "Panadapter" using the control on
the left side of the front console.
73, Larry
--
Larry Taft K2LT
T and T Measurements
drakerepair.com
800-687-9161
KD5NWA <[EMAIL PROTECTED]> wrote:
> Maybe I'm missing something here, but the display is indepen
The way I had success was to run directly to the sound card and not through the
SDR1000 box. Got rid of a lot of hum and noise. I'm using a D104 with the
preamp in the base that is battery powered. It goes directly into the D44
sound card input through the Eric2 interface card. I also have t
Jim,
Thank you for an excellent explanation of the two markers required. I'll be
back with the next question after I digest the information.
What I need is an accurate measure of frequency in the AM broadcast band, 500
to 1700 KHz, so I would think 1-10^7 is good enough for me. It needs to b
>
> Actually, you need to synthesize TWO signals in the >passband, because errors
> in the A/D sample clock can't be >calibrated out with a single marker.
Jim,
Well, I have to ask why two markers are needed or can you give a reference text
I could study to see why? Warning, KISS please as
You and I are headed in the same direction. I'm saying that the Xyloonia world
should creat a known stable frequency within the passband of the soundcard that
the PowerSDR can measure continuously to creat the offset needed to display the
correct frequency. Something like the old 100 kc xtal o
Xyloonians,
Build a selectable output frequency standard referenced to GPS or WWV. M/N
type thing. Have its frequency output within the range of the soundcard by
looking at but offset from the frequency tuned to at the moment. Maybe have it
outside the pan adapter window so it doesn't distra
Ahti,
I am seeing different gains at times through the RFE board. If the wrong band
relays were pulled in that could explain the different gain as it is always
less than 25 db, sometimes 9 db, sometimes 11 db, sometimes 19 db. I'll look
at the relay driver to see who gets pulled in. I also
Eric,
I have the K6GGO box with 4 board stack and 100 watt PA driven by the D44 card
using Eric2 interface card.
When the PA calibrates properly the audio line out is less than a volt P/P if I
remember. It only goes to 2 V P/P when the RFE gain has fallen off. As I said
I need to make a bette
I don't have a fireplace much less a furnace down here but I got lump of coal
in my stocking for Christmas.
Running the PA calibrate routine gave me a failure window. Investigation shows
that the RFE board sometimes doesn't produce its advertised gain. Sometimes
the failure is on 160 and othe
A step above the old Morey Goldberg method of testing.
Morey was an eclectic engineer in Syracuse, NY who sold boards and kits for
converting your TV into a "Genuine VT100 DEC computer terminal" and other such
nonsense back in the 60s and 70s. Morey would come up with a design, have the
boards
Good idea!
Actually we should use the SDR PTT/MOX to control the external relay and
transmitter via X2-7 as that will insure that the SDR is protected by the
proper sequence of changeover.
Time for the Universal Control Board. Then all the rigs can be properly
selected and sequenced.
T
Eric has to consider the protection of the front end of the receiver when
muting as I'm sure there is a max limit that can't be exceeded.
My TEK analyzer says "Max +20 dbm" on the input. Cost me $2200 to get it fixed
the last time I didn't pay attention.
Any leakage data on the various anten
I see that Crydom no longer makes the G2-1A03 or any of the G2 series MOSFET
opto isolator SSR. Possible subs are CPClare PLA 110, NEC PS141-1A-A, or
Panasonic AQV254.
Connector for amp keying should be RCA as that will provide better reliability
and less confusion when hooking up the rats ne
E^2,
I'll give it a runthrough and see what should be on a "little" board to isolate
the big bad world from the delicate innards of the ULN 2003.
What I did for X2-7 was put a diode cross the relay coil in my Drake L-4 amp as
that coil puts out over 400 V on the back voltage. The coil is dri
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