[hpsdr] Penelope Troubleshooting

[Stephen West-Fisher]

After being a lot more careful with testing (and not paying attention to my
power meter) I have a completely different set of problems. This evening I
also updated from SVN all the code, which included the new 2.2 Ozy code. For
completeness Penelope is at 1.7.

I DO have output in TUN at the antenna!
However, the power LEDs do not light and PowerSDR still shows 0 power out.
All of the tests below appear to be fine.
When I went back and checked pin 2 of JP2 and JP3 they both appear to have
the same peak to peak voltage which I believe is not supposed to be the
case.
Any ideas of where to look for these issues?

--
Stephen West-Fisher
N4IK


-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of David McQuate
Sent: Saturday, July 28, 2012 11:31 PM
To: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Penelope Troubleshooting

***** High Performance Software Defined Radio Discussion List *****

The fact that LED7 changes blink rate--to indicate PTT change--shows that
the FPGA is at least partially alive and working properly.  If Bob's
software / firmware suggestions don't take care of the problem, and you have
an oscilloscope, you might carefully probe the DAC input data lines while
TUN is active: bits 0 - 13 on U7 pins 14 - 1.  The lower bits should have
high frequency square waves, the higher bits, lower frequency.  These are
the digitized sine wave generated by PowerSDR to produce the CW TUNE signal.
The clock input, U7 pin 28 should have a very fast square wave -- 8 ns
period.  If they're changing, but there's no signal on JP3 pin 2, there's a
problem with the 
DAC.   Check that pins 24, 25 & pin 27 are +3.3 volts.

With TUN active, Atlas C19 should have digital signals--the transmit data--I
& Q data from the PC via Ozy.  The data is sent using "NWire", a digital
pulse-width modulation, with a "0" represented by a short high pulse, and a
"1" by a longer high pulse.  Thus when sending all zeros -- as when PTT or
TUNE are not active -- there will still be many fast pulses, in bursts with
a 48 kHz repetition rate.

Atlas C20 should also have digital sgnals -- the command and control data
broadcast by Ozy to Mercury & Penelope.

73,
Dave
WA8YWQ


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