Yes, coax jumpers do go bad from all the wiggling and jiggling,
connecting and disconnecting. And some are just pure crap to start with.
Also any PL-259 must be more than finger tight. I use a pair of 4"
Channel Lock pliers to snug mine. That solves many many problems.
I use my antenna bridge on 144 MHz and a dummy load to test my
jumpers. I wiggle, jiggle, pull and push. If the SWR flickers, I chop
the PL-259 off and start with a new piece of coax and a new connector.
It isn't worth trying to save a questionable connector or piece of coax.
73
Bob, K4TAX
On 1/1/2020 11:32 AM, Byron Cordes via TenTec wrote:
Let’s hope for the best. Bad coax jumper Bad pl259 antenna , ground connection
on antenna . Do you have different antenna ?
I just had a bad coax a few months ago.
73s Byron AC9PA
Sent from my iPad
On Jan 1, 2020, at 11:13 AM, 1291jim@gmail.com wrote:
Happy New Year All,
I have had an issue with my Eagle happen twice now.
Issue:
- Eagle loses tuning and SWR starts going crazy and jumping all over the
place
- Will not tune with inboard or outboard tuner
- Returns to normal operation after I shut in down for a while
Background:
- Has only happened when I have been operating for several hours and during
a 20 min+ QSO, (so lots of sending) and both times on 40M
- Eagle felt warm but not hot
- Antenna is an EndFed (Alpha Antenna J-Pole Sr)
- Without tuning on 40M SWR is 2.6 : 1
- Normally tunes to 1.0 or 1.1 : 1 with outboard or internal tuner
1st occurrence:
- I had been operating for 3-4 hrs
- Eagle was running 100W through an MFJ Intellituner Model 993B that tuned
SWR to 1.1 : 1
- SWR started jumping all over the place
- MFJ could not tune it
- I assumed it was the MFJ Tuner, shut it all down.
2nd occurrence: (last night)
- Had been operating several hours at 100W
- Eagle again through MFJ Tuner when SWR started jumping all over
- This time I bypassed the MFJ tuner and tried to tune with the Eagles
internal tuner
- The internal tuner could not tune the antenna and SWR continued going nuts
through the attempted tuning process
This morning after a rest, rig tunes FB with outboard or inboard tuner.
Pulling it from service now.
Any advice would be appreciated.
HNY ES 73 DE W6JIM
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