Guy thanks for the suggestion. I have investigated the source of my QRN
and it existed prior to my acquiring my Flex-3000. It is on a pole about
35 feet or so laterally from my shack providing electrical current to my
home and three others. I am sure the transformer's emissions are well
within limits it's just my proximity to it. The QRN on all bands but
it's at its worst on 30 meters and lower and gets worse the farther down
the bands you go. 6 meters is the exception to this as it's pretty bad
on 6 meters too. I am in town so I get town QRN and I am right under the
power lines behind my house almost. Adding more ferrites might work a
bit but it's coupling into the Antennas too. 31 mix seems to be the
"cure" for many things. When I am flush and can remember it I'll order
up some snap on chokes. I am 2 long blocks from the electrical
substation that provides power to this area too. The wife has all say
on where I live and she wants to live here.
On 05/26/2011 07:29 PM, Guy Harris wrote:
Steven,
When I first set up my F5k I had what I thought was QRN, and still
don't understand Precisely what is going on, but here's what I did to
reduce the apparent QRN:
I placed some LARGE snap-on ferrites, mix 31, on the power cords going
to my radio P.S. (linear), computer, monitor and peripherals. In fact
I put three of these on the power strip that powers my 'puter &
monitor & speakers; I kept adding them until there was no further
affect. I'll be more than happy to supply you with a source and P/N
for these items if you wish.
One more thing that reduced noise here was changing antenna types.
Even though I live in a rural area my situation does not permit much
of an antenna so I started out using an End Fedz dipole for 20m. A few
weeks ago I purchased an UltraMax100 and used a 66ft wire instead of
the 24ft that came with the matching network. I was startled to see
another 5dB drop in "apparent" QRN. I have seen days when the QRN is
so quiet that it is sitting below -130dBm!! I might add that the band
was pretty dead also...
Hope this helps.
~~Guy
W6NJX
On 5/26/2011 6:42 PM, Steven L Hess wrote:
Thanks Gerald You put my mind at ease.
I am cursing the QRN in my location and the propagation fairies and
sprites now.
On 05/26/2011 06:17 PM, Gerald Youngblood wrote:
Steven,
You probably did not damage it if it is hearing fine. It has input
protection diodes that will prevent damage from normal RF overload.
Now if you transmit into it directly or have a nearby lightning
strike, it could get damage from that.
73,
Gerald
Gerald Youngblood, K5SDR
President and CEO
FlexRadio Systems(TM)
4161 W. Howard Lane
Suite 1-150
Austin, TX 78723
Phone: 512-535-4713 Ext. 202
Email: ger...@flexradio.com <mailto:ger...@flexradio.com>
Web: www.flexradio.com <http://www.flex-radio.com/>
Tune In Excitement (TM)
PowerSDR(TM) is a trademark of FlexRadio Systems
On Wed, May 25, 2011 at 8:39 PM, Steven L Hess <sh...@bak.rr.com
<mailto:sh...@bak.rr.com>> wrote:
Well the silence to my query about the Flex-3000 receiver
toughness must mean something but I must be too dim to fathom what.
The reason I am asking is I had two instances where I transmitted
on the same frequency the Flex was sitting on and am wondering if
I have damaged my receiver.
It appears to me to be working fine but this is something hard to
judge. If it was damaged it would be deaf I think and not just
degraded but I know nothing of these things.
Steven
-- Sent from my Linux box.
Regards de KC6KGE.
A very happy Flex-3000 user.
Skype flamebait
Gmail flamebait at gmail dot com
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--
~~~*Guy Harris*
--
Sent from my Linux box.
Regards de KC6KGE.
A very happy Flex-3000 user.
Skype flamebait
Gmail flamebait at gmail dot com
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