Jeff Anderson wrote:
Hi James,
At this QTH the problem is definitely at the computer output and *not* at
the SDR1K itself.
So, the problem is now narrowed down a bit.
The problem is now computer hardware or software.
So, what spec machine are you using, CPU (hyperthreading, multicore
Subject: Re: [Flexradio] Has anyone seen this CW Transmit problem?
Jeff Anderson wrote:
Hi James,
At this QTH the problem is definitely at the computer output and
*not*
at
the SDR1K itself.
So, the problem is now narrowed down a bit.
The problem is now computer hardware or software.
So
Jeff Anderson wrote:
Hi Lee,
Very interesting!
I haven't been checking my power, so I just tried the following experiment:
1. Using an Autek WM-1 meter (in Peak Mode), set my SDR1K power to 10
watts when read on this meter.
2. Transmit CW: observe RF envelope
-radio.biz
Subject: Re: [Flexradio] Has anyone seen this CW Transmit problem?
Has anyone been able to narrow down the problem to the computer
soundcard output, or is something going wrong inside the SDR1000 hardware.
This problem could be happening in the computer software or the sound
card hardware
I recently came across a CW Transmit problem while running the official Flex
1.6.1 code, and Eric at Flex has tried to replicate it but has not had any
luck. And I'm wondering if anyone else has seen it, or could keep a lookout
for it occuring.
The problem is this - sometimes
Jeff,
Occasionally I have been transmitting SSB but what comes out is DSB.
This can be cured by reseating the 3.5 mm connectors on the SDR. This
may be causing your intermittent CW problem.
Tom W0IVJ
Jeff Anderson wrote:
I recently came across a CW Transmit problem while running the
- Original Message -
From: Tom Thompson [EMAIL PROTECTED]
To: Jeff Anderson [EMAIL PROTECTED]
Cc: FlexRadio@flex-radio.biz
Sent: Tuesday, May 23, 2006 3:46 PM
Subject: Re: [Flexradio] Has anyone seen this CW Transmit problem?
Jeff,
Occasionally I have been transmitting SSB but what comes out
Thanks for the note, Tom.
It isn't a problem with the seating of the connector at the SDR1K - when the
problem occurts, I can observe that the Line Out I Q signals lose their 90
degree phase relationship prior to these connectors.
73,
- Jeff, K6JCA
Tom Thompson [EMAIL
I have been fighting this problem for several months.
The problem started after 1.4.16. Prior to this
release the situation was rock solid. I get precisely
what you describe. Also my power output advances
significantly from a nominal 100w to 135w when I get
the modulation. The situation seems
I have been fighting this problem for several months.
I have not seen this problem and (as you well know) I operate CW regularly.
However, I also operate (for a variety of reasons, such as feeding my HF
amplifier) at lower power levels.
Have you tried running with, say, 60 or 80 watts and
Hi Lee,
Very interesting!
I haven't been checking my power, so I just tried the following experiment:
1. Using an Autek WM-1 meter (in Peak Mode), set my SDR1K power to 10 watts
when read on this meter.
2. Transmit CW: observe RF envelope on an external oscilloscope and
Eric can't replicate it either, which is what makes this problem particularly
frustrating for me.
One thing worth mentioning: unless you monitor your Transmit signal with an
external oscilloscope, you could experience this problem and not be aware of
it. (Although Lee has pointed out
The situation is unrelated to RFI. It happens as low
as 10W barefoot or at 1500W. It happens on all bands
I have antenna for (160 through 20)and it happens on
all of my antennas. It happens into a precision dummy
load.
I have about 20lbs of ferrite hanging off the SDR just
to be sure, and I
I don't have a scope but I do have another RX and it
is clearly discernable on the second RX (aka the
transmitted signal). It is also clearly discernable
in the monitor when it occurs.
Lee
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