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BITX40 Microphone options

 

Now that I have a BITX40 on the way, I have been thinking about options for a microphone. ?I did a search through the archive and I see

nothing about people using Speaker/Mics.?

I remember years ago that the Small Wonder Labs White Mountain SSB rigs used an HT speaker mic to keep the

rig packaging compact (no need for an internal speaker), so I am just wondering if anyone out there has gone the route of

using a Speaker/MIC like the ones used on VHF/UHF HTs? There seems to be lots of inexpensive Kenwood-HT-clone speaker/microphones

on eBay so I am wondering if anyone has recommendations for any particular one (no sense re-inventing the wheel). I believe that these?

pretty much all use Dynamic mic elements so a capacitor would need to be added to block the small DC voltage that the rig supplies for an

electret mic element. BTW, there are also some inexpensive headsets designed for HT use that might also prove useful for portable operation.?


My other thought is to use an inexpensive computer headset with a separate jack/cord for the PTT switch. These use electret mic elements so

they should work fine on the BIX40. I have a spare lightweight LogiTech H110 headset that I picked up on sale for $8, that should work nicely.?


I seem to recall having read a few comments regarding "thumpy" T/R switching, is this a big issue? I am thinking if that is the case, a headset?

might not be the best option (I would like to keep my hearing).?


Cheers

Michael VE3WMB?
 

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Michael,

I have had good results with an aviation headset with a 2.2k resistor in series with the mic. ?I think all of the hard wired ones, i.e., not Bluetooth, have electret mics. ?The nice thing is since these are made for communication in noisy, general aviation cockpits the headphones are good quality and the passive noise reduction is good, i.e., you can't hear the dog.?I see these at hamfests for $20-30 often with a sign "Will not work with Ham Gear" which is true for most ham gear since it is expecting a ceramic, crystal ?etc mic and doesn't supply the so-called phantom voltage the electret requires. A particularly good brand is David Clark. ?Great company.?They last forever, are made in the US and they will repair them for very reasonable prices.

73,

Pat AA4PG


Pat Griffin
http://www.cahabatechnology.com

From: [email protected] <[email protected]> on behalf of Michael Babineau <mbabineau.ve3wmb@...>
Sent: Monday, May 15, 2017 7:29:26 AM
To: [email protected]
Subject: [BITX20] BITX40 Microphone options
?

Now that I have a BITX40 on the way, I have been thinking about options for a microphone. ?I did a search through the archive and I see

nothing about people using Speaker/Mics.?

I remember years ago that the Small Wonder Labs White Mountain SSB rigs used an HT speaker mic to keep the

rig packaging compact (no need for an internal speaker), so I am just wondering if anyone out there has gone the route of

using a Speaker/MIC like the ones used on VHF/UHF HTs? There seems to be lots of inexpensive Kenwood-HT-clone speaker/microphones

on eBay so I am wondering if anyone has recommendations for any particular one (no sense re-inventing the wheel). I believe that these?

pretty much all use Dynamic mic elements so a capacitor would need to be added to block the small DC voltage that the rig supplies for an

electret mic element. BTW, there are also some inexpensive headsets designed for HT use that might also prove useful for portable operation.?


My other thought is to use an inexpensive computer headset with a separate jack/cord for the PTT switch. These use electret mic elements so

they should work fine on the BIX40. I have a spare lightweight LogiTech H110 headset that I picked up on sale for $8, that should work nicely.?


I seem to recall having read a few comments regarding "thumpy" T/R switching, is this a big issue? I am thinking if that is the case, a headset?

might not be the best option (I would like to keep my hearing).?


Cheers

Michael VE3WMB?
 

I have a Baofeng speaker mic repurposed just for a microphone. There are two ways to use the speaker. One is to get a microphone connector with enough pins for mic, PPT, gnd and spkr., what I have done for one radio, so that I can use a standard CB microphone, is to put a "pigtail" for the speaker long enough to plug into the speaker jack. Looks a little odd, but works fine. I do this, as I have stereo mic jack (ptt, mic, gnd) that is wired to be compatible with my Xiegu X1M, so that I can swap microphones and also use my digital jumper cable that I made up for the X1M to use with a SignaLink USB interface.


73 /paul W3FIS
 

Michael,

You should also consider the fact that most ?dynamic microphones output a much lower signal so you will need more gain in the microphone's amplifier.
--
Ion

VA3NOI
 

Koss CS-130 is a good, cheap headphone with microphone, with two jacks.? It works with the BITX40 with no modifications.
philip yates
 

i have the Icom HM-36 connected, works directly wired no mods as yet.

Phil - G7BZD

On Tue, May 16, 2017 at 6:36 PM, KC8WBK via Groups.Io <cruisenewsnet@...> wrote:
Koss CS-130 is a good, cheap headphone with microphone, with two jacks.? It works with the BITX40 with no modifications.
 

Hi Michael,

I am using a Baofeng microphone on my BITX40, it is the microphone designed for the UV5R that I also have. ?

I use the microphone "as is" - not modified. This way I can use the microphone on both radios :-)

It is just a matter of making the right connections back to the BITX40 cables that are supplied with the BITX40 kit.

The standard insert with the Baofeng microphone is fine, and sounds great, however you can easily replace it with the insert that comes with the kit. ?The wiring diagram showing how the cables need to be connected is attached below.


Image result for baofeng microphone pinout


73

Andrew

VK4JAM
Steve Black
 

Where can I get info on the Koss CS-130? headphone. Google drew a blank. Steve kb1chu
glenn silver
 

Look for Koss cs-100. I use them on the bitx40 and my ft-817nd. Amazon has them for 13.78.

Glenn
WU3Z
 

Andrew - Thanks for the diagram. I have been wanting to get one of those mics and give it a try. Did you find a dual jack for it or are you using two singles?
 

Andrew :

Thanks very much for posting this. I picked up a Generic (unbranded) Baofeng Speaker Mic on eBay for ~ $US3, so this wiring diagram?

will be very useful.

Cheers


Michael VE3WMB?
 

Koss CS-100 is correct, sorry about the typo
 

Thanks for the heads-up on the Koss CS100 Computer Headset for use with the BITX40 !

I have been using my Yahama CM-500 with good results but I just received?a Koss CS100 from Amazon today.

I used the CS100 headset tonight and worked YU7XX in Serbia with my BITX40 and he was flabbergasted that I was only running 5W.
He said the audio sounded great so I am sold on the CS100. ?

Cheers

Michael VE3WMB / VA2NB?

P.S. I am operating from my cottage in QC using a 204 foot doublet at 50 ft.
John P
 

On Mon, May 15, 2017 at 07:25 am, pat griffin wrote:
I have had good results with an aviation headset with a 2.2k resistor in series with the mic.
And I took Pat's advice and set mine up to use?an aviation headset (since I have a bunch of them). I'm using a David Clark H-10-13.4 and it works?great. I also bought a cheapie computer desk microphone and modified the base by adding a round piece of plywood to allow vertical space for a PTT switch. The element in that mic looks identical to the one that came with the kit.




?
--
John - WA2FZW
 

If compactness is essential you could use the supplied element and put it in case with the end-cap for the BNC antenna connector (also supplied). As it happens the microphone element fits snugly in. You can pierce two holes in the plastic and use a small press switch (might even have been supplied with the Bitx) for the PTT.?

Described in this video:?

https://www.youtube.com/watch?v=CqybyZkAoUo
 

What Bitx40 needs is an extra amp stage for the mic.

With my lung capacity down I can't do "haaaaloo" level of yelling anymore so I am using an amped motorola mic.
If you are adventurous try a preamp for the mic with mods and a mic drive control for better control.

An opamp with gain control is better suited for the bitx40. If you don't want to disturb the Bitx40 board then
use a capacitor to couple a preamp.

Raj

At 06/07/2017, you wrote:

If compactness is essential you could use the supplied element and put it in case with the end-cap for the BNC antenna connector (also supplied). As it happens the microphone element fits snugly in. You can pierce two holes in the plastic and use a small press switch (might even have been supplied with the Bitx) for the PTT.

Described in this video:

chris gress
 

I use the supplied mic insert on a old ?pen ?works we'll I use PTT on the radio?

On 6 Jul 2017 15:25, "Raj vu2zap" <rajendrakumargg@...> wrote:
What Bitx40 needs is an extra amp stage for the mic.

With my lung capacity down I can't do "haaaaloo" level of yelling anymore so I am using an amped motorola mic.
If you are adventurous try a preamp for the mic with mods and a mic drive control for better control.

An opamp with gain control is better suited for the bitx40. If you don't want to disturb the Bitx40 board then
use a capacitor to couple a preamp.

Raj

At 06/07/2017, you wrote:

>If compactness is essential you could use the supplied element and put it in case with the end-cap for the BNC antenna connector (also supplied). As it happens the microphone element fits snugly in. You can pierce two holes in the plastic and use a small press switch (might even have been supplied with the Bitx) for the PTT.
>
>Described in this video:
>
>




IMG_20170706_152949.jpg

 

i have done the same. the supplied mike insert fits into a tube from a marker pen

terry
 

On Thu, Jul 6, 2017 at 07:24 am, Raj vu2zap wrote:
With my lung capacity down I can't do "haaaaloo" level of yelling anymore so I am using an amped motorola mic.
What voltage (Vpp) do you look for going into the bitx's mic in?
 

On my analog VFO board #66, I measured across C107 - a level of 500+ mV pp gives full power with the level control
R136 midway.

With the supplied mic I can't get the power while speaking in a normal level. With a normal voice I should be able to
see 3-4 watts!

Raj, vu2zap

At 08/07/2017, you wrote:

On Thu, Jul 6, 2017 at 07:24 am, Raj vu2zap wrote:
With my lung capacity down I can't do "haaaaloo" level of yelling anymore so I am using an amped motorola mic.

What voltage (Vpp) do you look for going into the bitx's mic in?

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