Re: [QRP-L] (no subject)
- We are in the process of backing up and punting instead. I've been
advised to move the crystal frequency of SR-40 by 12KHz on the low or
on the high side, to get away from some of the noise in the center of
the receivers band.
Not an easy job due to lack of crystals at those high frequencies, I
found one 17 KHz low, too low for my taste. I'll be checking for
something closer later when I get a break.
Any guesses as to how low could I pull a 35.328 MHz crystal? 48KHz lower?
I kept the names of the interested parties, and will keep you posted.
At 01:03 PM 9/28/2005, Garey Barrell wrote:
>Please put me down for one of the 8.830 MHz units.
>Thanks for doing this for us!
>73, Garey - K4OAH
>Drake C-Line Service Manual
>Cecil Bayona wrote:
>>If one or two guys/gals are interested in getting a OSC module for
>>8.830MHz the Kenwood panoramic output on the back of the radio, let
>>me know before tomorrow night and I'll include an extra module for
>>you for cost + shipping. I'll send a last call before sending out
>>the purchase order.
>'Never argue with an idiot. They drag you down to their level then
>beat you with experience.'
- When tuning an SDR 1000, if spur reduction is turned off, the DDS is tuner
11025 khz below the frequency of interest and the software (DttSP)
oscillator is set to -11025 khz to recover the frequency of interest. This
works well but for the spurs from the DDS.
If spur reduction is turned on (the normal case) the DDS is tuned to the
nearest low spur point (as documented by some of the AD docs) and then
DttSP oscillator is set to an appropriate value to recover the signal of
interest. This generally results in a DttSP oscillator value between -9.5
and -12.5 khz.
On the SoftRock all the tuning is done with the DttSP oscillator and it
ranges over +/- 24 khz - giving a tuning range of 48 khz.