Strange popping sound when VX-8R is scanning both channels

[Wise87]

Today while I was working the local ham repeaters on Ch-A and my local Public Safety on Ch-B, I was hearing a popping sound when one channel (A) was scanning and (B) was stopped on a transmission. The popping sound was in synch with the frequencies flashing by on Channel A. Is this normal? I have attached an audio recording. Channel A is scanning and B is listening to a transmission on the Sheriff’s frequency. You will clearly hear the popping sound.

Update: Update: This also happens when using external speakers or headphones. Also after talking to a friend of mine, he says this could also be a freq interference issue. In trouble shooting more the 444Hz freqs in Ch-A are the ones causing the popping sound. Once I removed them (Skip) from the scan, I no longer heard the popping.

 

[Moleculo]

Interesting problem. What happens if you turn ON menu 20-CLOCK SHIFT? I also wonder if this is being caused by the PRIORITY SCAN feature or the WX ALERT (option 111) being turned on?

 

[Wise87]

Interesting problem. What happens if you turn ON menu 20-CLOCK SHIFT? I also wonder if this is being caused by the PRIORITY SCAN feature or the WX ALERT (option 111) being turned on?

moleculo
I checked both settings and they were off. I talked to a ham buddy of mine and he says this is common on many devices. Certain freqs will interfere with each other. I only hear the interference when a 444Hz freq. If I remove them from my scan list, I don’t hear a thing, nice and quiet.
Dan

 

[surfpaddler]

Mine also does this when either A or B is stopped on a received channel and the other (B or A) is scanning and crosses a band boundary. I haven't looked at the block diagram for the radio but it is probably a band switching artifact which causes the receiving channel to breifly 'stutter'. I considered it normal.

The block diagram in the technical suppliment is big enough I really need to print it our on a big sheet in order to see what is going on, I can't follow it very well on my tiny (12inch) laptop screen. I would not worry about it though. While the VX-8R has two independant VCO units there is a lot of shared hardware in the radio and the cards are pretty tight.

 

[ke7vvt]

These previous posts that might be usefull

http://www.worldwidedx.com/handitalkies/34054-does-your-vx-8r-pop.html

http://www.worldwidedx.com/handitalkies/35115-yaesu-vx-8r-audio-problem.html