RE: [softrock40] softrock lite + Xtall tuning
- Hi Chris,
I am using an SRLite 8.3 with Christos' PowerSDR.
I did not install the PIC, but just two BS170s
and two 10K resistors directly onto the PCB in
accordance with Guido's circuit (you can find
it in the file section titled "Si570"). I also
made a separate PCB equipped with BPFs and relays,
so it now covers all bands. It's marvelous.
You don't need to change DIP switch positions.
First, I would suggest the LPT port setting be
checked using Christos' LPT.exe which is in SV1EIA's
file folder. Run the LPT.exe and PowerSDR to make
sure that your LPT port is functioning OK.
Also, under the same folder, you can find Si570.exe
with which you can control the freq without running
PowerSDR. (Rocky/M0KGK can work with it.)
My OS: WinXP SP2 LPT=378
Since the SDA and SCL are inverted, I had a trouble
at the beginning. I inadvertently connected to
SDA/SCL positons instead of the inverted pins:
Pin 14 /SDA
Pin 17 /SCL
Now, it works fine.
I hope this would be of your reference.
Yas - Tokyo
--- Chris Stake <stake@...> wrote:
> I wonder if someone could help me with a problem. I
> have a Softrock lite 8.3
> = Xtall and it works very well. I wanted to
> experiment with tuning the Si570
> from my pc and so I downloaded PowerSDR v1.12.0. I
> built an inverting
> interface to LPT pins 14 (/SDA) and 17 (/SCL) to the
> DIL socket where the
> PIC goes and set all the switches to open. The SCL
> and SDA lines sit at 3.3
> V until I turn the mouse wheel when a very plausible
> train of pulses appears
> on both. But nothing I do makes the Si570 change
> frequency. I have approx. 3
> Meters of cable to the LPT. I have tried this on two
> computers and still no
> tuning. But all works fine when I replace the PIC
> and operate in dipswitch
> tuning mode.
> Any ideas?
> Chris Stake