Scott,
Loss of RX after transmitting is the FireWire loosing track of the RX
thread coming from the radio. The loss obviously due to RF getting
into the computer somewhere, usually via the FireWire cable, but can
also be coming in via other points too, USB cables, keyboard, NIC
cables, video, etc.. You can choke it out with the clamp on ferrite
chokes, better if you can find the originating source of the RF. If
your antenna is close by, then the near field RF is going to be hard to
keep out, but if the RF is localized to a particular band or
frequency, it could be common mode RF coming back on the feedline. A
good current choke (Radio Works makes several) on the feed line before
it enters the shack may help, also just changing the length of the
feedline slightly may also help (4 - 6 feet) . If it is a particular
band, sometimes a quarter wave length of wire for that frequency (make
sure it is well insulated ) attached to the station ground as a stub
tune filter can also help.
A couple of well placed chokes can help, finding the real source is
much better.
Hope this helps,
73,
Dudley
WA5QPZ
Brian Lloyd wrote:
On Fri, Dec 4, 2009 at 3:19 AM, Scott Myers <[email protected]> wrote:
but not the network itself. Then just AFTER transmission (not during)
PowerSDR will freeze within 5 seconds. It is fixed by a quick stop/start of
PowerSDR. It is probably a combination of factors, but certainly some wire
length harmonic issue somewhere seems to be the culprit based upon this
evidence.
If the RFI is causing one of the ethernet controllers to fault, it
could be that after the fault clears the network stack restarts all
the sessions. Windows can get very "chatty" on the network when it is
first coming up with lots of broadcasts. I can imagine your networking
stack and ethernet driver getting very busy and causing a spike in
DPCs.
What I just said is pure speculation. You might try repeating the
experiment while watching DPCs and which processes get the CPU time.
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