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Author Topic: Cut Wire on the 811H  (Read 2700 times)
K7RHT
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Posts: 3




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« on: October 10, 2012, 10:01:35 PM »

Hello,  I just purchased a used 811H and it was probably not well taken care of so I started out with a cleaning, dusting, and general check out before powering it up.  With the cover off, I almost immediately noticed a cut green wire coming off of the input tuning circuit (back board on the amp) from the aux tuning coil (10/12) going to ground but now cut.  Any ideas why this was cut and should it be re-attaced?  thoughts?  K7RHT
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NO2A
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Posts: 822




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« Reply #1 on: October 10, 2012, 10:47:30 PM »

This is the mod to allow xmit on 10/12 meters. Hopefully it wasn`t used on 11m.    Wink
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K7RHT
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« Reply #2 on: October 11, 2012, 07:22:16 AM »

Thank you, I suspected as much.  He had a Ham radio, couple of towers, but CB antenna's so I suspected that he was one of those using illegal power at some time in his life.  Well, the good news is that I now have his towers, amp, etc. so he is out of it for now anyway.  -72 de K7RHT
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K7RHT
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« Reply #3 on: October 11, 2012, 08:22:26 AM »

Typo in my last post  -73, not -72  Roll Eyes
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K8AXW
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Posts: 3958




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« Reply #4 on: October 11, 2012, 09:02:52 AM »

RHT:  I too 'rescued' a linear from a former CB'r.  I suggest you go over the tube socket connectors/connections and look for over heating and examine the LOAD cap for signs of arcing.  These are signs of abuse and stress often encountered after being used on the CB.

Never mind the "72."  Just as long as you didn't say, "Seventy thirds!"   Roll Eyes

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N4CR
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Posts: 1692




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« Reply #5 on: October 11, 2012, 07:05:38 PM »

You might want to check the input tuning on 10 and 12 meters. One of them might be screwdrivered.
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73 de N4CR, Phil

Never believe an atom. They make up everything.
K3STX
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Posts: 1050




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« Reply #6 on: October 12, 2012, 08:30:48 AM »

Why would you guys suspect the guy used it on CB. The original owner was a Ham, he probably cut it so he could use the amp on 10 meters (like any other Ham would do)!

paul
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K8AXW
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« Reply #7 on: October 12, 2012, 09:02:52 AM »

Paranoia?  Past experience? Distrust? Cautious?   Pick one.
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NO2A
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Posts: 822




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« Reply #8 on: October 12, 2012, 10:24:54 AM »

I didn`t mean K7RHT used it on 11m,I meant that if somebody did,that type of duty cycle(am) isn`t good on the 811`s. They simply can`t take it. Sorta like driving with one foot on the gas,and one on the brake at the same time... Wink
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KF7CG
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« Reply #9 on: October 16, 2012, 10:49:00 AM »

As far as the screwdrivering of the 10 or 12 meter input settings; there is only one adjustment for both 10 and 12. With this in mind it is probably peaked near 11 as a compromise for reasonable input tuning on both.
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K3STX
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« Reply #10 on: October 16, 2012, 06:22:25 PM »

Talk about ironic!!!

paul
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