Posted: 3/22/2010 3:38:55 PM EDT
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When I tune using the dial, as I pass through the frequencies I hear a 3 step tone, each tone sounds about one octave higher than the last, spaced exactly 1KHz apart, then there is about 2KHz without a tone, then it happens again.
What is that? I scanned through the manual but there was no discussion of it. Also tried google but nothing stuck out. Looked through all the menu options but nothing affects it. My guess is that its some kind of indicator to remind people to keep 3KHz away from each other (which I wish to God people would) |
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No, it is not a feature - rather you are "tuning by" the signal and you are hearing the different frequency mismatch of the SSB signal.
Try tuning with your VFO with smaller steps (I don't have an IC-718 to tell you where to find that adjustment, so guess it is read the manual for specifics - sorry) to see if you get an effect less pronounced in steps. Whatever, don't count on the sound to space you! 
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Quoted:
No, it is not a feature - rather you are "tuning by" the signal and you are hearing the different frequency mismatch of the SSB signal. Try tuning with your VFO with smaller steps (I don't have an IC-718 to tell you where to find that adjustment, so guess it is read the manual for specifics - sorry) to see if you get an effect less pronounced in steps. Whatever, don't count on the sound to space you!
This is exactly why it annoys me.....I can be 5+KHz away from any discerable signal but I cant use the spot on the dial because of the constant tone. Its a consistent thing up and down the dial on every band...I can tune slowly or quickly, its there no matter what. |
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Quoted:
Quoted:
No, it is not a feature - rather you are "tuning by" the signal and you are hearing the different frequency mismatch of the SSB signal. Try tuning with your VFO with smaller steps (I don't have an IC-718 to tell you where to find that adjustment, so guess it is read the manual for specifics - sorry) to see if you get an effect less pronounced in steps. Whatever, don't count on the sound to space you!
This is exactly why it annoys me.....I can be 5+KHz away from any discerable signal but I cant use the spot on the dial because of the constant tone. Its a consistent thing up and down the dial on every band...I can tune slowly or quickly, its there no matter what. Maybe it would be worth posting a sound clip since you hear it everywhere? |
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Sounds like something generating a wideband signal like a computer monitor or other electronic device in or near the shack.
On what band(s) are you hearing this? Is it on every band or just one? Is it possibly AM broadcast (especially on 40m)? It also sounds like you are tuning in 1kc increments, try setting the tuning step to 100hz. This won't cure the "tones" you are hearing, but will allow finer tuning. Try unplugging various devices around the house and see if the noise goes away. |
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Sounds like something generating a wideband signal like a computer monitor or other electronic device in or near the shack. Yep. If you're using a switching 12 volt power supply to power your 718, you might be hearing harmonics of the supply's switching frequency. Try disconnecting the antenna - If you still hear the tones, they're probably being generated inside your 718 (i.e., "birdies"). |
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Sounds like something generating a wideband signal like a computer monitor or other electronic device in or near the shack. Yep. If you're using a switching 12 volt power supply to power your 718, you might be hearing harmonics of the supply's switching frequency. Try disconnecting the antenna - If you still hear the tones, they're probably being generated inside your 718 (i.e., "birdies"). This is the reason I don't use a switcher to power the shack. Birdies in a wideband reciever are unavoidable but rig Mfg's calculate internal harmonics and do pretty good keeping harmonics in the bands of interest down. Listening outside the ham bands though..all bets are off. |
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I was getting a tremendous amount of interference from my Linksys Wireless router. I unplug the router, all of the strange RF goes away. Many consumer electronic devices generate spurious signals, so start unplugging things till it goes away.  Sometimes it's the router, sometimes the wall wart. D-Link was bad about this. Also it seems that many manufacturers submit a model for FCC compliance, get approved, then actually build the item without the filtering needed to prevent RF hash. Just being cheap by leaving a lot of holes on the circuit boards. I guess jumpers are cheaper than real parts. |