| Author |
Message |
    
Jyd
| | Posted on Monday, October 28, 2002 - 7:39 am: | 
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i put a channel gaurd in my vr-9000 and it dont seem to make a difrence.everything is how the instruction say,i got it powered by the on switch grounded ti a if can,and mounted where the instructions said to.any ideas? |
quickshot
| | Posted on Monday, October 28, 2002 - 11:20 am: |
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Jyd,
Call the supplier!! I have dealt with them befor and they are very helpful!! |
bruce
| | Posted on Monday, October 28, 2002 - 12:10 pm: |
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The channel guards i put in radios work great how did you measure it i used a IFR 1200 and got a 20 db inprovement at +/-20 khz with the 10,695 filter
The 455 khz filter is ausm on a am radio down at least 20 better that the MURADA type 455 filter in the stock radio Just for the heck of it i put 2 10.695 back to back and a 455khz in my Titan 50,000 UV ONE channel away was totaly gone but so was FM so i had to back off but if you are not seeing a diffrence you need to remesure the 2 filters again O one problem on GALAXY and RANGER clones the 10,695 filter can mess up the noise blanker |
jyd
| | Posted on Thursday, October 31, 2002 - 10:15 pm: |
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i did not measure,but no change in bleed over.noise blanker still works good. |
ChillyDog
| | Posted on Friday, November 01, 2002 - 10:03 am: |
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jyd,
One thing to consider when evaluating the performance of the Channel Guard is that there are two types of "splatter" interferance, and Channel Guard can only improve one of them.
The Channel Guard, an excellent product from one of the best mail order/internet companies in radio, is designed to improve a radio's selectivity. Selectivity refers to the radio's ability to pass on the signal from the desired channel and to reject signals from nearby channels. Selectivity is also called adjacent channel rejection.
What the Channel Guard (or any other product) can't do is remove bleed-over caused by overmodulated or improperly tuned transmitters that generate spurious signals (splatter) within the channel of interest.
In other words, if a crappy transmitter is generating trash that splatters into your channel, the only fix is on the transmitter side.
This is not a limitation of the Channel Guard. It is an unavoidable fact of radio physics, and one of the reasons that overmodulating radios (too much "swing") and overdriving cheap amps may not result in bad audio _on-channel_ but will mess up other communication _off-channel_. This is why you shouldn't clip limiters.
Best Regards,
Bob |
bruce
| | Posted on Friday, November 01, 2002 - 12:34 pm: |
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JYD e-mail me |
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