Hello John,
I had the same issue at first. I now can run full 1.5kw with no issues. The
trick is to think simple (see below).
One thing that is almost always overlooked is equipment placement. Put
everything that is computer on one side of the Flex and everything RF on the
other side with NO CABLES crossing. EXAMPLE In my case I have the computer
stuff on the left side of the operating desk. The Flex on the desk. Amp and
tuner on the Right side of desk. The antenna cables go to the right of the
amp and tuner. Again, NO CABLES CROSSING. Going from only one inch
separation to several feet makes an amazing difference. Now if you still
have any issue, it will be low level and will take few ferrites (if any) to
fix it. I can remove all grounding (for testing) and still do not have RFI.
Let the cables cross and it is a different story. Please let me know how you
make out and feel free to ask any questions with direct email.
I have been a ham for 50 years and have always looked at equipment placement
and that has paid off. The best part is that it is free.
73, Bruce, W8HW, [email protected]
I fix ham radios and have fixed two way radios for 40 years.
----- Original Message -----
From: "W1JCW" <[email protected]>
To: <[email protected]>
Sent: Monday, September 12, 2011 8:54 AM
Subject: [Flexradio] Flex 3K and 5K software shut down QRO.
No luck adding the ground or the two chokes on each end of the fire ware
cable.
It seems just 20m even when I don't use my Acom 2k. If I turn the drive up
to 75w
the audio cuts in and out and I can hear the relays in the 5K.
All other bands qro are fine, no issue.
Must be some harmonic on 20m getting into the box or feeding back into it.
Suggestions ??
73-
W1JCW
John
From: W1JCW
Sent: Friday, September 09, 2011 8:44 AM
To: Ray, K9DUR
Subject: Flex 3K and 5K software shut down QRO.
I don't have a ground on the PC so I'll add that tonight and see how it
works.
I did have a choke on each end of the fw cable but that didn't work but I
had no ground then.
I'll put a choke on each end of the fw if adding the ground on the PC
doesn't work.
Stay tuned.
Thanks for the replies.
73-
W1JCW
John
From: Ray, K9DUR
Sent: Thursday, September 08, 2011 8:11 PM
To: [email protected] ; [email protected]
Subject: Re: [Flexradio] Current Flex 3000 software shuts down when
runninghigh power.
Frank,
That definitely sounds like RF feedback. The most likely culprit is the
firewire cable. I had the same issue running my amp with my FLEX-5000A.
First, make certain that your PC is connected to the shack ground. After
all, it is better than half of the radio.
If you are using the stock firewire cable that came with the rig, replace
it
with the one by Granite Digital. Is costs about $40 & is availabel from
Flex.
Finally, if you still are having problems, add ferrite chokes at each end
of
the firewire cable.
The above steps eliminated my RF feedback problems entirely. Now I can
run
1kW on all bands with no issues.
73, Ray, K9DUR
http://k9dur.info
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