Galaxy Roger Beeps Poor When Cold

[Wire Weasel]

Hey gang, I'm experiencing poor response from the factory roger beep when the radio is cold....and not even below freezing. Have to use radio for a while and eventually the beep comes back to normal sound and duration.

Anyone know which part is performing poorly and can be replaced with a better/different part or whatever?

Galaxy DX 94HP and see this problem with other Galaxys when used mobile. Never seems to be a problem when radios used as bases.

Thanks!

 

[Shockwave]

Hey gang, I'm experiencing poor response from the factory roger beep when the radio is cold....and not even below freezing. Have to use radio for a while and eventually the beep comes back to normal sound and duration.

Anyone know which part is performing poorly and can be replaced with a better/different part or whatever?

Galaxy DX 94HP and see this problem with other Galaxys when used mobile. Never seems to be a problem when radios used as bases.

Thanks!

It's going to be a small ceramic type capacitor. Can of freeze spray and covers off the radio should find it. Try replacing with poly types. Could be two caps, one for tone and one for duration.

 

[Wire Weasel]

Have already replaced caps for duration. Did that to extend them. Factory were aluminum can axials, 2.2uf. Replaced with same type 4.7uf. Works great. So that's not it. Not cheap ceramic disc caps.

Uses resistors to set tone.

This mod at cbtricks under Galaxy DX 959, of which I have one of these also.

Thanks though

 

[Chop]

my 98vhp did the same thing. i never did fix it. it went away when the radio warmed up.

 

[Shockwave]

Have already replaced caps for duration. Did that to extend them. Factory were aluminum can axials, 2.2uf. Replaced with same type 4.7uf. Works great. So that's not it. Not cheap ceramic disc caps.

Uses resistors to set tone.

This mod at cbtricks under Galaxy DX 959, of which I have one of these also.

Thanks though

I think if you use that can of freeze spray you are going to be surprised to see it is a ceramic capacitor changing value with temperature. Tone caps used in audio oscillators are much smaller value then 2.2 uf. More like in the .01 ballpark to make an 800 cycle tone. While there are resistors that effect tone also, they are part of the RC circuit and a ceramic cap is almost certain to be there too and the part that drifts with temp. Even if I am wrong (it happened once) the freeze spray is going to locate the drifting part for you very easy.

 

[Wire Weasel]

I think if you use that can of freeze spray you are going to be surprised to see it is a ceramic capacitor changing value with temperature. Tone caps used in audio oscillators are much smaller value then 2.2 uf. More like in the .01 ballpark to make an 800 cycle tone. While there are resistors that effect tone also, they are part of the RC circuit and a ceramic cap is almost certain to be there too and the part that drifts with temp. Even if I am wrong (it happened once) the freeze spray is going to locate the drifting part for you very easy.

Well congratulations on being wrong for the 2nd time in your life.

Freezing spraying everything in the area will net you nothing. It may make the symptom reappear, but will not easily identify an individual component in this circumstance. Freeze spray is best used in the reverse application which is locating a part that is overheating.



Anyone else have some ideas?

 

[Shockwave]

Well congratulations on being wrong for the 2nd time in your life.

Freezing spraying everything in the area will net you nothing. It may make the symptom reappear, but will not easily identify an individual component in this circumstance. Freeze spray is best used in the reverse application which is locating a part that is overheating.



Anyone else have some ideas?

Yeah, I guess freeze spray should come with proper use instructions. Did your can say to spray everything in the area? Spraying localized areas one at a time will isolate the drifting part. The straw can easily chill individual parts. I'm not busting your chops, just offering you a sure fire way of finding the part. Best of luck.

 

[Shockwave]

Remember a roger beep is nothing more then the simplest audio oscillator and timer circuit combined. When you consider all of the components both active and passive, what do you have? One or two transistors or perhaps an IC and some resistors and capacitors to form the RC time bases. Of these parts the only ones that can be temperature sensitive enough to cause drift you can notice is going to be capacitors. Any advice other then checking capacitors in this case is just wasting time.

 

[Wire Weasel]

Hi SW,

This is actually a common problem with all the modern Galaxys that have roger beeps. I was merely hoping that someone would have already come upon a fix for the problem.

As I've said, the factory cap in the circuit has already been replaced. These radios are loaded with metal can caps. If they all went haywire when cold, then the whole damn radio would never work until warmed up and that is simply not the case. There are no ceramic disc caps in the roger beep circuit.

Thanks!