Hi All
Just though I would add my two cents (pence) I have had exactly the
same experience from the front mic socket, on 20m and above RF problems
using the rear one no problems I resolved it by making a mic extetntion lead
up and decoupling the mic with a couple of .1uf caps seems to have resolved
the issue the only thing that makes me a little suspicious is that maybe
these components may have been missed off.
Ian G0CTO
-----Original Message-----
From: flexradio-boun...@flex-radio.biz
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of J D Lambright
Sent: 11 October 2010 03:54
To: flexradio@flex-radio.biz
Cc: jdlambri...@the-law-offices.com; isellbo...@aol.com
Subject: [Flexradio] RF Problems with a Flex 5000
A friend (KC5PD) and I (KF5U) each purchased a Flex 5000A on the same order.
The radios were identical from the factory, shipped at the same time, and
they both included the ATU and the 2nd receiver. We are both running PSDR
v1.18.6. From the beginning, KC5PD has been having a serious RFI problem
with his rig, while I have not had even a single RFI problem with mine. He
is using a Heil mic connected thru the front of the F5000, while I am using
a Heil PR-781 mic connected to the balanced input on the back of my Flex.
As an experiment, KC5PD brought his F5000 to my shack today so we could run
some tests. First, we connected his mic through the front input on my rig.
He had SSB QSO's on 17m and 20m with several hams with no RFI problems
whatsoever.
Then we simply disconnected my F5000 and connected his F5000 in its place.
Nothing was moved. Except for replacing my F5000 with his, everything else
remained identical - same antennas (cubical quad), same power supply, same
computer, same firewire cable, same speaker cable, etc. Same everything.
He even sat in my chair!! In trying to talk with the hams we did
previously, KC5PD immediately had very serious RFI problems, where we had no
RFI problems minutes earlier using my F5000 with the same mic connected to
the front.
We then connected my mic to the balanced I/P on KC5PD's F5000, and the RFI
problems disappeared.
In summary, with both rigs at my QTH:
1. I have no RFI problems on my rig whether I use the balanced I/P with
my mic or the front mic connector with KC5PD's mic.
2. With KC5PD's F5000 at my shack, he has serious RFI problems with the
mic connected through the front I/P.
3. With KC5PD's F5000 at my shack, he has no RFI problems with the mic
connected via the balanced I/P.
Thus, there is some sort of significant RFI problem with KC5PD's F5000 when
he uses the front mic input. In an identical configuration using his mic
and his mic cable, I have no such problem. (His mic cable has been properly
grounded per Dudley's and Heil's recommendation.)
As an interesting side note, the serial # on his rig bears absolutely no
relation whatsoever to the serial # on my rig, even though they were on the
same order and were shipped together. I don't know what this means, but it
seems odd.
Any comments or suggestions would be most appreciated, as KC5PD has about
exhausted his "Flexibility" in trying to get a resolution to this problem.
J D Lambright - KF5U
Law Offices of J D Lambright
Conroe Tower, Suite 450
300 W. Davis
Conroe, Texas 77301
Ph: 936-539-3499
Fax: 936-539-1799
E-mail: jdlambri...@the-law-offices.com
www.the-law-offices.com
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