6600 odd behavior

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`Just noticed something odd on 17m.. As I tune up the band starting at 18068 the band is quiet when I get to 18085 the noise floor jumps. Has anyone else noticed this?  when I dial back to 18075 then the noise floor drops back down
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Mike

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Posted 1 month ago

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Bill -VA3WTB

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You may find that happen on other bands as well, I see it 80 meters. It is in relation to your antenna sweet spot, the area where the band is very noisy is were you antenna is at best SWR. If you use a outboard antenna tuner and adjust the tune you will see the area move with the new tuning.
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Rich McCabe

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Are you by chance going into "WIDE" when this happens?  Possibly have a second slice on the band somewhere?
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Jim KJ7S

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In General, when you go 'out of band', there will be a change in the way the filters work when you switch from a 'normal mode' to a General Reciever situation, so that will sometimes do what you are describing. 
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Bill -VA3WTB

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Guys, this is normal. On some bands, depending on how broad your antenna is if you pan out so you see most of the band you may see a rise in the noise floor
(Edited)
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Rich McCabe

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This does not sound like what he is talking about. Sounds like its on/off at that frequency and has nothing to do with the antenna.

Rich
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Bill -VA3WTB

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In that case, maybe clear the ATU MEM, it must be click off and on at that spot.
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Tim - W4TME, Customer Experience Manager

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Mike - do you hear a relay click when it happens?
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VE7ATJ

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I get the same thing -- a relay click then the noise floor increases, but mine occurs @ 14.165 Mhz.  I thought it was an ATU setting, so I tried re-setting it, but it remains the same.  I'll check the manual to see if there's some way to clear all the ATU settings, then restart again.  Thanks Tim.
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Rich McCabe

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If you think the ATU is the cause just put it in bypass mode and tune up and down. 

Rich
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Bill -VA3WTB

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right click on mem, it will ask about clearing mem
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VE7ATJ

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Yup... found that in the manual and clearing the memories did the trick!  I'll have to set them all up again, but that's not a big pain.
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Bill -VA3WTB

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Glad to help...have fun

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