[Elecraft] Adapter for use between iPhone headset and a KX2/KX3

[Walter Underwood]

There are two different ways that phone mic/earbuds are wired to a TRRS plug. All Apple products should be wired the same way. The two standards are AHJ/CTIA and OMTP. Most modern phones use the AHJ/CTIA spec. See: https://help.longtailproducts.com/hc/en-us/articles/207970396-Smartphone-Headset-Standards-Apple-iPhone-AHJ-CTIA-OMTP

A clever way to adjust compression is to use the two voice memories and play back different settings to compare them. Turn the power down to zero first! That was a suggestion from Lyle, KK7P.

Also, it is probably best to set TX EQ before setting compression, because the frequency content of your voice will probably interact with the compressor.

I compiled audio setup steps gleaned from this list in a blog post.

https://observer.wunderwood.org/2015/09/09/transmit-audio-and-compression-with-the-elecraft-kx3/

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jul 2, 2018, at 5:23 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
> 
> 
>> On Jul 2, 2018, at 5:20 PM, Phil Hystad <phystad at mac.com> wrote:
>> 
>> Do you recommend speech
>> compression set to max or was that just a test of audio quality check.  
> 
> I generally leave TX CMP at 20, but even at 30, the audio is very clean. The extra punch can help with QRP and/or small antennas.
> 
> 
>> 
>> I still have all my iPhone headsets from my original iPhone 1 through my current 6s.  Actually,
>> still have all those iPhones too.  I may test each one to see how they work — now, I need to
>> find them all though.  Just ordered the Y-adapter cable from Amazon.
> 
> Just be sure to listen to your signal on another receiver (well attenuated) before going on the air.
> 
> 73,
> Wayne
> N6KR
> 
> 
>> 
>> 73, phil, K7PEH
>> 
>>> On Jul 2, 2018, at 5:09 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
>>> 
>>> Several KX2/KX3 users have asked what I use as an adapter to go from an iPhone headset to the rig’s headphone and mic jacks.
>>> 
>>> Here it is:
>>> 
>>> https://www.amazon.com/gp/product/B00PYZ2BT4/ref=oh_aui_bia_detailpage_o02_s00?ie=UTF8&psc=1
>>> 
>>> This unit works beautifully with both my old and new iPhone headsets. The combination of the headset and this adapter take a tiny amount of space in my go-bag. Audio reports are great, even with speech compression set to max (MENU:TX CMP). 
>>> 
>>> You’ll need to set MENU:MIC BIAS to ON, and I also recommend setting MIC BTN to OFF. 
>>> 
>>> You can tap the XMIT button to start voice-mode transmit, or use VOX. See VOX menu entries in the owner’s manual.
>>> 
>>> Note: There’s a rumor that one legacy version of the iPhone headset was different from the others. I don’t have any info on this, but it means there’s a slight risk that this $6 adapter won’t work in your case. But it certainly works with the earpods I bought a couple of months ago.
>>> 
>>> 73,
>>> Wayne
>>> N6KR
>>> 
>>> 
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