[TenTec] HELP! Eagle Tuning Problem
cw_de_n5op at sbcglobal.net
Wed Jan 1 15:54:14 EST 2020
Within all the useful advice has (mostly) been an assumption the problem must be in the tuner. I’m skeptical of that. I suspect it’s something to do with a connection to the antenna, a connector, or as others have said, a jumper. I think you said the antenna SWR is 2.6:1 so there may be a current loop somewhere that gets hot enough to cause connection problems.
As a quick test: when the tuner wigs out, quickly switch to a dummy load. If you get a match with no odd behavior, it’s not the tuner.
"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith
> On Jan 1, 2020, at 11:13 AM, 1291jim at gmail.com wrote:
> Happy New Year All,
> I have had an issue with my Eagle happen twice now.
> - Eagle loses tuning and SWR starts going crazy and jumping all over the
> - Will not tune with inboard or outboard tuner
> - Returns to normal operation after I shut in down for a while
> - 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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