Hi Larry,
Due to the failure of the parallel port data communication you may get a
wrong relay or semiconductor switch - and correspondingly some wrong
filter - to pass your signal. That would explain the attenuation. My
recommendation is the USB to parallel adapter.
Happy new year and 73,
Ahti OH2RZ
- Original Message -
From: [EMAIL PROTECTED]
To: FlexRadio - Eric [EMAIL PROTECTED]; FlexRadio@flex-radio.biz
Sent: Tuesday, December 27, 2005 8:54 AM
Subject: Re: [Flexradio] Coal in my stocking
Eric,
I have the K6GGO box with 4 board stack and 100 watt PA driven by the
D44 card using Eric2 interface card.
When the PA calibrates properly the audio line out is less than a volt
P/P if I remember. It only goes to 2 V P/P when the RFE gain has
fallen off. As I said I need to make a better test setup and take
some written data. Getting to have too many variables to remember it
all.
What I don't understand yet is why it will sometimes get to 30 meters
before it fails and other times it dies on 160. I need to do a better
job of grounding things now as I have a lot of cables strung around
between the computer, the SDR1000 on the bench and the scope in the
test rack.
Time Passes-
OK, now have a 1 inch copper braid strap between the players in this
game. When the rig is working properly in Calibrate I get 1.4V P/P
audio into the box, 0.6 V P/P RF at the input to the RFE board and 5.5
V P/P out the BPF board into the PA. This gives 40 to 60 watts out
say on 80 meters. I calculate the gain of the RFE as 19 db. When it
doesn't work I get a gain of 9 DB. It is intermittent but usually
fails at 30 meters. Sometimes at 160 meters. The drive from the TRX
board seems consistant with the audio input.
I need to figure out how to get PortMon working to look at the
parallel port to see if the relays are always getting the proper
signals for each band. I would think a non working relay would give
no signal through the string.
I can also pull the RFE board and bench test it to see what is wrong.
What are the signal levels at the input and output of the RFE board
for a 60 watt nominal output?
Any other software tests I can do?
And WHY ARE YOU MESSING AROUND WITH THE SDR BUNCH WHILE YOU ARE ON
HOLIDAY? Dealing with this crowd is like herding cats.
73, Larry K2LT
From: FlexRadio - Eric [EMAIL PROTECTED]
Date: 2005/12/26 Mon PM 11:34:36 WET
To: [EMAIL PROTECTED], FlexRadio@flex-radio.biz
Subject: RE: [Flexradio] Coal in my stocking
Larry,
If you are measuring that much output on the cable that goes to the
radio
labeled To Line Out, but you are likely overdriving the audio. Are
you
using the Delta 44? If so, is it set to -10dBv Output as specified
in the
Delta 44 Quick Start Guide (www.flex-radio.com/delta44/delta44.htm)?
Eric Wachsmann
FlexRadio Systems
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Sunday, December 25, 2005 11:41 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Coal in my stocking
I don't have a fireplace much less a furnace down here but I got lump
of
coal in my stocking for Christmas.
Running the PA calibrate routine gave me a failure window.
Investigation
shows that the RFE board sometimes doesn't produce its advertised
gain.
Sometimes the failure is on 160 and other times it will get to 30
meters
before the failure.
I've been monitoring the audio input which gets to 2 + volts P/P and
the RF
into and out of the RFE board. When it works there is the 25 db of
gain.
When it doesn't it seems to be low gain, 5 db or so. I'll make up a
better
set of probes to get into the RFE board tomorrow and use the dual
trace
scope to get hard numbers.
Don't think the problem is software, I reloaded 1.4.4 and the
database and
messed around with other settings and no success. No luck with
1.4.5v9
either. Receive works fine.
Thats why I missed the net. Had the operating station torn apart to
make up
the test setup for my lump of coal.
By the way, it was 78 F here this afternoon, a really nice day.
Merry Xmas
Larry K2LT
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