JR,
End-fed long wires are notorious for radiating RF into the shack, and
especially so if you don't have an excellent ground on the other leg of the
feedline. On 160 M, I would guess it's going to be much worse than other
bands, and your cable modem may have been unlucky enough to have a resonance
somewhere near where you were transmitting. Your feedline was likely a big
part of the radiating structure.
Eric NC6K
Message: 13
Date: Mon, 28 Jan 2019 02:53:16 +0000
From: webform@b4h.net
To: 3830@contesting.com, w6jbr@arrl.net
Subject: [3830] CQ160 CW W6JBR Single Op HP
Message-ID: <20190128025316.1.A45E9ECEBA346292@b4h.net>
Content-Type: text/plain; charset="utf-8"
CQ 160-Meter Contest, CW - 2019
Call: W6JBR
Operator(s): W6JBR
Station: W6JBR
Class: Single Op HP
QTH: Oceanside, CA USA
Operating Time (hrs): 5:27
Summary:
Total: QSOs = 74 State/Prov = 20 Countries = 2 Total Score = 3,894
Club: Southern California Contest Club
Comments:
I had just installed a new end fed wire, fed via 9:1 QRO unun. The SWR was
very high, and I was unable to tune it. I then bypassed the unun and fed it
directly from the coax, which tuned FB. I started to test the wire with a
500 watt carrier, when my cable modem appeared to start overheating/burning!
Has anyone else had such an issue?!
Needless to say, I shut everything in the shack down, and gave up on using
the end fed wire. I went to my 31? wire vertical, which did not tune on
160m, but added a large roller inductor at the base, set to max inductance.
The antenna immediately tuned FB. Since I used a set of clip leads to insert
the coil between the unun and the antenna, I went without the amp, and just
ran the rig barefoot at 200W. Thankfully, there were no issues with the
modem burning up.
I had a relatively low noise floor on the band, and could hear many stations
but not all of them could hear me. I was excited to work Canada, Mexico,
Hawaii, and KP4, and heard other Caribbean stations that could not hear me.
I do hope to have a better 160m antenna, but space here is limited.
I am thinking of trying a 30 foot helical vertical next.
Thanks for the Qs. Hope to see you next time.
73, JR
FT-1000MP MK V @ 200W
MB-V-A Tuner
31 foot wire vertical
Dell WinXP
N1MM+
MMTTY
Posted using 3830 Score Submittal Forms at: http://www.3830scores.com/
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