If you want to run from a 6 volt wall wart you should consider the changes by N1RX to substitute a 7805 for Q1 (see ).
I have used a USB extension cable to get the device on the bench for testing.
If I tune my Kenwood TH-F7E to the 3 frequencies and hold the antenna within an inch or two of the board I get an S9+ signal.
If there is no clock signal then you should carefully check C6 and C7 are correct (labelled 101J). If you mistakenly switched C6/C7 with C12/C13 then the clock will not run.
Recheck T1 connections - if either 3nad 5 or 4 and 6 are swapped then it will not work.
-- John g0orx/n6lyt
Stan Rife wrote:
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John,
I do not hear a carrier at any of those freqs. I double checked my method by sniffing the XG1 and I hear it at 7.040. What level would the clock frequencies be at? I just have a peice of coax on my K2 and holding it near the SR-40. The XG1 was pretty loud, but that is a 50microvolt sig. I didn't check it at 1microvolt. I have a scope here, but am not very well versed at using it. That is something I have been hoping to rectify since I aquired it. Maybe this is my chance. Hi Hi
Do I need exactly 5 volts to power the SR-40, or could I use something like a 6 volt wall wart? That is the only way I am going to be able to get this thing out on the bench where I can get to it.
Appreciate the help, John,
Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
-----Original Message-----
*From:* softrock40@...
[mailto:softrock40@...] *On Behalf Of *John Melton
*Sent:* Thursday, September 29, 2005 10:48 AM
*To:* softrock40@...
*Subject:* Re: [softrock40] Not working: HELP
Hi Stan,
the S9 carrier at 7.056 is normal (even without the device powered).
If you have a scope you can should check the clock signals that are
shown on the schematic (QSD Timing Diagram) and also check that they
are
all getting to U5.
If you do not have a scope you could tune a receiver to the 28.224,
14.112 and 7.056 clock frequencies to check that they are being
generated but you will not be able to check that they are getting to U5.
If the clocks are OK I would check the wiring of T1. I have 2
SoftRock40's and when I built the first one I did not get the
wiring of
T1 correct and all looked OK but no signals.
Hope that is of some help.
Regards,
John g0orx/n6lyt
Stan Rife wrote:
> I finished the SoftRock last night and I plugged it in to
one of my
> USB hubs...no green light from the LED. I put it back on the
bench and
> verified everything and all looked ok. After messing with it for
a while and
> still not getting a green LED from my USB hub, I decided to plug
it in to
> the USB on the back of the computer...GREEN LIGHT. Wondering why
the USB hub
> doesn't put out 5 volts, but will worry about that later. I
thought that the
> 5 volts daisy chained from device to device.
> So, it lit up, but I am not receiving anything. The latest
binary
> was acting really weird on my computer, so I reinstalled PowerSDR
and then
> unzipped the binary's from August in to the SDR install. It
appears to work
> ok now, I think. I have no way of verifying that. All I get is a
little
> background noise (I got this before though) and a solid S-9
carrier at
> 7.056, but this is ALL I ever got from the software whenever I
would start
> it up with NO hardware. So, I hope this is making sense, the
SR-40 is either
> not working properly, or the software is not working.
> I can play the canned .wav files and that works, but
nothing from
> the SR-40. Made sure my LINE-IN port on the soundcard was
selected, and
> checked that the volume was up sufficiently. I don't know what
else to
> check, or how to check it. I am electronically challenged, sorry
guys. Plus
> it is hard to get back behind the PC to do anything. I don't have
a 5 volt
> power supply. Can I use a 6 volt wall wart?? I didn't see a 5
volt regulator
> on the SR-40.
> Can someone tell me where to start? And what about the S-9
carrier
> at 7.056?? Is that supposed to be there?? I do have an XG-1
signal source,
> but I'm not getting anything to the software.
>
> Thanks,
>
> Stan Rife
> W5EWA
> Houston, TX
> K2 S/N 4216
>
>
>
>
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