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mikefox whiskey Profile
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Accomplished DX-er
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Registered: 02-2009
Location: Northern Ireland
Posts: 403
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Re: AUDIBLE HUM FROM MICROPHONE.


You could be right Andy, that hole is maybe supposed to be there, if it was though there must of been a problem inside the diaphram itself maybe? I don't know enough about microphones to know what is even in there, anyway replacing that diaphram with another one (though slightly different) has cured the problem.

I don't know if I have another problem now, but when I am transmitting after about 20 minutes I think I can here RF in the headphones and a roughness on the audio, I seriously don't know if it's real or in my head! I have been working too hard recently! I wonder could it be the 9v battery though I've tried a few.

I wish I could find out what wires to use to take the power for the microphone from the radio and do away with the need for a battery.

---
Patrick
5/Apr/2009, 11:07 pm Link to this post Send Email to mikefox whiskey   Send PM to mikefox whiskey
 
John193 Profile
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Freebander
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Registered: 11-2008
Location: South Glos
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Re: AUDIBLE HUM FROM MICROPHONE.


Patrick test all the radio pins from ground to each pin in turn on rx, stick a dummy load on and do the same thing but in tx. one pin will go from a float voltage probably about 4v to about 8-9v thats ya power out pin then just trace it back. Hope that helps. All mikes have an equalisation hole in them otherwise they'd blow up like a ballon when the rain comes! did you solder the new element in? it could have been a dry joint that is now OK. Maybe? just a thought [sign in to see URL]
6/Apr/2009, 12:13 am Link to this post Send Email to John193   Send PM to John193 MSN
 
mikefox whiskey Profile
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Accomplished DX-er
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Registered: 02-2009
Location: Northern Ireland
Posts: 403
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Re: AUDIBLE HUM FROM MICROPHONE.


Hi John, thanks for the info, I tried the removed microphone element in another mic just to see if it was a dry joint, I'm 100% sure now that the element was damaged as the problem was still there with a massive hum, so that is that sorted.

As regards to the wiring for the voltage to supply the amplifier in the mic, I have identified the pin on the TS850s radio that supply's the voltage out but I don't know what wires on the astatic mic to connect to that pin (there are two unused wires on the microphone lead) it has to be one of those or a combination perhaps. Unfortunately I do not understand the schematic diagram of the mic to see what wires are the voltage ones.

---
Patrick
6/Apr/2009, 8:18 am Link to this post Send Email to mikefox whiskey   Send PM to mikefox whiskey
 
fb102pascal Profile
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Registered: 03-2009
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Re: AUDIBLE HUM FROM MICROPHONE.


Hi Patrick
Look for the cablage microphone my friend and test .
     Ts 850s and 110c Astatic
Micro Blank = 1
Red = 2 emission =Transmiting
Reception 6 = Black = Recept
Mass = braid 7
  Mass TX = blue mass 8

73's Pascal
14FB102.


---
73's and good dx
from

14.FB.102
UNIT.102
Pascal...
10/Apr/2009, 12:32 pm Link to this post Send Email to fb102pascal   Send PM to fb102pascal
 


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