Re: 7000 intermittent?


Did you try a different coax jumper to the Dummy load?

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Tuesday, 01 June 2021, 04:39PM -07:00 from Tom Norris fernblatt@...:


On Tue, Jun 1, 2021, 9:40 AM david vanhorn <kc6ete@...> wrote:
"Fire and glass"?

On Tue, Jun 1, 2021, 9:53 AM wabate via> wrote:
Hi All,

After using my 7000  for years Murphy has shown up but in a way that defies my logic.  I typically do not use it on 6M.  I was testing on 6M and i twas receiving well.  Went to transmit (RTTY mode) full carrier but was only getting 20 watts out and the SWR was max.  Checked the antenna with another rig and the antenna was fine.  Put a dummy load on the 700 and got the same low output and high SWR.  Puzzled, I tried another dummy and got the same result.  Power was measured with my Bird meter. 

This is the goofy part.  Went back to the antenna and maybe one out of three key downs the output went to 80 W and a decent SWR,  Could not duplicate that anomaly with the dummy load.  Thought maybe the antenna relay was intermittent so I tried HF and got full output and low SWR into the dummy load.  Did not try UHF. 

My guess is the SWR sensing circuit is faulty.    Is the 6M SWR sensing circuitry different from HF?  I'm a fire and glass guy so limited on what I can do with SMD.


73 and TIA,

Bill, K3PGB

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