Primarily for general aviation discussion, but other aviation topics are also welcome.
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User avatar
By bambuko
#1591632
If in doubt RTFM :D
External mike option in the menu controls "assignment of microphone controlled with the PTT switch", so (afaic) it is not going to change how the microphone performs (and my PTT works fine), nevertheless I shall test it.

I don't need side tone (at least afaik), because I am not using headset - don't particularly want to hear myself on the speaker.

I know PTT and phantom supply, my question about voltages was to do with pre-amplified mike wanting 9-28 volt (see: http://www.pilot-usa.com/headset-access ... pa-7x.html) and me measuring only 5 volts.

Appreciate you all guys, trying to help me :thumright:
thank you
User avatar
By flyingeeza
#1591645
bambuko wrote:If in doubt RTFM :D
I don't need side tone (at least afaik), because I am not using headset - don't particularly want to hear myself on the speaker.

Sorry I just assumed headset ops. :oops:
User avatar
By kanga
#1591691
bambuko wrote:no problem at all :thumright:
I sometimes find it difficult to follow myself :lol:


not a graduate of the Oozlum aviation college, then: :)

https://en.wikipedia.org/wiki/Oozlum_bird
bambuko, Chris Martyr liked this
#1591734
Sooty25 wrote:have you selected EXT MIC in the menu?


Ah, I mentioned this in a thread a long time ago in a galaxy far far away.

https://forums.flyer.co.uk/viewtopic.php?p=1553589#p1553589

Worth a punt.

flyingeeza wrote:That is indeed how a condenser (capacitor, electret, etc) mic works. When you PTT, the mic circuitry supplies a preset dc voltage (phantom supply) to power the little amplifier (FET) inside the mic capsule.


Or to supply the power for the amplifier in an amplified dynamic mic.

I have no idea if 5V is suitable for the chosen microphone though!

kanga wrote:not a graduate of the Oozlum aviation college, then: :)

https://en.wikipedia.org/wiki/Oozlum_bird


I like the way the Wikipedia article quotes:

The oozlum bird is sometimes used as a symbol of self-reference and circular argumentation. For example, author Charles Seife wrote: "Like the mythical oozlum bird, Wikipedia seems to have the ability to fly around in ever decreasing circles until it flies right up its own rectum."

Though it does supply a citation which isn't Wikipedia...
flyingeeza liked this
User avatar
By bambuko
#1595046
An update:

1) it's nothing to do with external/internal mike option in the setting menu (as suggested before, it selects which mike is controlled by PTT switch on the side of the radio).
I am using external PTT so it matters even less.

2)it's all to do with the choice of mike - all those I've tried (whether electret or dynamic) were not amplified and that's why I had the problem.
I tested it with this one:
http://www.pilot-europe.com/microphones ... rs/pa7-mic
and all is working fine :thumleft: :thumleft:
Simples (if you know :lol: )
Sooty25, Paul_Sengupta liked this
By Rez
#1730145
neilmurg wrote:If anyone needs a SCU-15, I have one surplus to requirements

Yes I do need a SCU-15 for my FTA450L if still available :) . How much is it including postage?
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