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SBITx with Heil headset?
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Is anyone successfully using one of the available ?Heil headset adapters for an sBitx? Which one? Or do I need to make my own?
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Hi Neil,
I’ve only used CW since I got the sBitx?but I have looked at the microphone and believe it can be,?though their is a?BUT !
There are two main types of Heil Headsets a pro ( dynamic) or IC (elect). And only one will work, as I found out with the Icom 705.?
Hope that gives you help in determining which type you have etc.?
Regards?
On Tuesday, March 18, 2025, 6:12 pm, Neil K6NCX <neil.fullagar@...> wrote: Is anyone successfully using one of the available ?Heil headset adapters for an sBitx? Which one? Or do I need to make my own?
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Thanks. I have the dynamic mic, and used it successfully with my FT-818.
On Tuesday, March 18, 2025 at 11:12:00 AM PDT, Neil K6NCX <neil.fullagar@...> wrote:
Is anyone successfully using one of the available ?Heil headset adapters for an sBitx? Which one? Or do I need to make my own?
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You may wish for a lot more sensitivity/ higher output than the Heils provide. ? Around-30 dB is much better …
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On Mar 18, 2025, at 22:29, Neil K6NCX via groups.io <neil.fullagar@...> wrote:
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Thanks. I have the dynamic mic, and used it successfully with my FT-818.
On Tuesday, March 18, 2025 at 11:12:00 AM PDT, Neil K6NCX <neil.fullagar@...> wrote:
Is anyone successfully using one of the available ?Heil headset adapters for an sBitx? Which one? Or do I need to make my own?
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Learning about mic sensitivity specs:
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You’ll likely be disappointed with -50 db mics….
Gordon kx4z
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On Mar 19, 2025, at 04:10, Gordon Gibby KX4Z via groups.io <docvacuumtubes@...> wrote:
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You may wish for a lot more sensitivity/ higher output than the Heils provide. ? Around-30 dB is much better …
On Mar 18, 2025, at 22:29, Neil K6NCX via groups.io <neil.fullagar@...> wrote:
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Thanks. I have the dynamic mic, and used it successfully with my FT-818.
On Tuesday, March 18, 2025 at 11:12:00 AM PDT, Neil K6NCX <neil.fullagar@...> wrote:
Is anyone successfully using one of the available ?Heil headset adapters for an sBitx? Which one? Or do I need to make my own?
This morning, I got busy and tested 4 cartridges I had purchased months ago, and built up another mic for a friend with a DE version.? ?From the results, I wrote the enclosed article, which gives lots more information how to find high output cartridges and make inexpensive microphones.??
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You may wish to use a 20K or so resistor to drop the sBitx bias voltage if yours is 12V.? ?I think I did that on some of my earlier units and need to on the one I just updated.? ?
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An interesting thing -- my first sBitx (used) had significant variations in the crystal filter ripple response -- this current one seems a LOT less ripple visible across the waterfall.? ?Great going, Ashhar!!
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Happy reading!
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Gordon KX4Z
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Thanks. I have a dynamic Mike headset, so I’m not worried about the bias voltage. What I really need to know is what adapter to use.
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So here is a piece about one of Heil dynamic headsets. You can see that they quote an output impedance of 500 ohms.?
The DC impedance may even be lower.
What this means is that it will basically effectively short out the bias voltage. Luckily, capacitor CD 27 will keep that from taking the input chance out out of its normal operating range. So I don’t think any harm will occur. However, the output level of the dynamic element is -60 DB. So basically you aren’t going to have any significant single side band output RF power.
73,
Gordon kx4z?
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On Mar 19, 2025, at 15:54, Neil K6NCX via groups.io <neil.fullagar@...> wrote:
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Thanks. I have a dynamic Mike headset, so I’m not worried about the bias voltage. What I really need to know is what adapter to use.
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So here is a piece about one of Heil dynamic headsets. You can see that they quote an output impedance of 500 ohms.?
The DC impedance may even be lower.
What this means is that it will basically effectively short out the bias voltage. Luckily, capacitor CD 27 will keep that from taking the input chance out out of its normal operating range. So I don’t think any harm will occur. However, the output level of the dynamic element is -60 DB. So basically you aren’t going to have any significant single side band output RF power.
73,
Gordon kx4z?
On Mar 19, 2025, at 15:54, Neil K6NCX via groups.io <neil.fullagar@...> wrote:
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Thanks. I have a dynamic Mike headset, so I’m not worried about the bias voltage. What I really need to know is what adapter to use.
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Gordon, the mic supply voltage on my sBitx DE is showing 9v. The mic you are using shows operating voltage of 2v.
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All you did was add the resistor right?
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The mic I am using is one that came with the uBitx v3 kit. I have some noise in the audio that sounds kind of like a mic in the wind with no wind screen on it. Was described to me as a rushing sound by another HAM.
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So I'm hunting for more mic options for troubleshooting.
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73
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Hi kc5kwz
I'm assuming?you are running your radio from?+12 VDC or?+13 or so -- if you are measuring?+9 on the mic that means they have already added a resistor to ground to lower the DC bias voltage.? ?On the V2 that I'm currently working on, I found it was running?+7 Volts, indicating a resistor had been added as well.? Although not on the published SCHEMATIC, others have shown photos showing the resistor.? ?I remember having to add one on the DE version I used to own.
The high output mic that I suggested is indeed shown as "typical" 2V -- but it is specified to work all the way to?+10.? ?They work FINE for me at?+7 and they should work FINE for you also.? ?
However, I don't exactly know what is causing the "wind" or "rushing" noise you?are describing.? ? So not sure what will fix it.? ?
If there is any way that you can listen to your own signal, that is the easiest and best way to work out these problems.? ?Some ways that will work: a)? a separate receiver with a tiny antenna, just enough to pick up some signal, allowing you to listen to yourself b)? use a WEBSDR, either from the kiwi sites, or from the Websdr.org sites -- there are more of the kiwi's it turns out
Let us know what you find out! 73 Gordon KX4Z
Gordon, the mic supply voltage on my sBitx DE is showing 9v. The mic you are using shows operating voltage of 2v.
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All you did was add the resistor right?
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The mic I am using is one that came with the uBitx v3 kit. I have some noise in the audio that sounds kind of like a mic in the wind with no wind screen on it. Was described to me as a rushing sound by another HAM.
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So I'm hunting for more mic options for troubleshooting.
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73
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perhaps my article may help you:
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It's in German, please use a translator of your choice.
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73s,
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Jens/DH1AKY?
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Hi Jens,
Brilliant idea, will try this over weekend.?
Thank you?
On Friday, March 21, 2025, 9:57 am, Jens / DH1AKY via groups.io <jens.wagner767@...> wrote: perhaps my article may help you:
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It's in German, please use a translator of your choice.
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73s,
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Jens/DH1AKY?
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Jens / DH1AKY