Thanks, Tony for the feedback on the V6.0 SoftRock for 30M. Thanks
also for working out the new component values for using the SR-V6.0
on 30. This is something I have not had time to try yet myself.
I still have PLENTY of the 40.5 MHz fundamental-mode crystals Tony
mentioned. I originally bought these for use in converting the
Version 4 to 30 meters. I figured that they would also work in V6.0
with the proper input filter changes. I'm glad it has proven to be
Anyone interested in some of these to experiment with, can send me
an email, off the group list.
--- In email@example.com, "kb9yig" <raparks@...> wrote:
> Recently Bruce Beford reminded us that he still have some
> fandamental 40.5 MHz crystals for sale at $2 per crystal. This
> afternoon I built a v6.0 SoftRock for 30m using a 40.5 MHz crystal
> received from Bruce in yesterday's mail. As I type this the 30m
> v6.0 SoftRock is playing nicely on this PC.
> The 40.5 MHz crystal divides by four to give a frequency slightly
> below 10.124 MHz in the SoftRock. Thus even with a soundcard that
> samples at 48 kHz the 30m band coverage is from slightly below
> MHz to almost 10.148 MHz.
> Changes to the 40m/80m circuit to go to 30m include the following:
> C21=C23= 470pF
> C22= 180pF
> L1 is 14T of #30 wire on a T30-2 core (0.85uH)
> L2 is 22T of #30 wire on a T30-2 core (2.2uH)
> T1 is 14T of #30 on the primary and 7T of #30 on each of the
> secondary windings.
> C5 is 100pF as in the 40m/80m kit
> C6 is not used as in the 40m/80m kit
> I found it necessary to connect a 10k resistor between the base of
> Q2 and ground to get a suitable signal from the collector of Q2 to
> clock FF's in U2. (I want to do a little more work on the v6.0
> oscillator circuit.)
> The SoftRock would also give some SW coverage with center
> at 5.062 MHz by using the divide by eight position on JP1.
> I think Bruce may still have some of the 40.5 MHz crystals for
> Tony KB9YIG