David Clark info:
H10-50 & H10-56 both use HIGH impedance mic's that require 8-15v DC not polarity sensitive. Have 150-600 ohm earphones. Have built in volume control with 20db variation.
H10-76 uses a LOW impedance mic that will not work in circuits that provide DC bias voltage. Earphones are 10 ohm impedance with volume control at maximum level.
H10-66 Has a selector switch for BOTH HIGH and LOW impedance systems, It WILL work with either. Earphones are 150-600 compatable with 15db volume control.
The pinout for the 4 ring single connector (U174/U) is
Originally Posted by AC0GR
1) (tip) mic red
2) earphone green
3) mic white
4) (ground) earphone black
I use a pair of JRC ST-3 headphones that I was fortunate enough to pick up on eBay for $30 in new condition. They are very comfortable and have the right audio response for me.
Telex Airman 760
I use the light weight telex ones. The great thing about these is the frequency response is only 300-3kHz. Human voice.
I don't listen to music with them so why do I need 20-20kHz? Just more things to muddle the signal.
Is my thinking flawed on this?
They are about a 100 bucks and have worked great for me.
Hello everyone, I'm new to QRZ and I just saw this thread and couldn't resist making this my first post. I fly small aircraft as a hobby and I couldn't agree with W0GI more. I really can't wait to get the DC headsets off my head as soon as I can. But another hobby of mine is listening to music, and because of my odd hours alot of it is through High-End Headphones. It may sound odd, but there is a HUGE market for headphones that aren't sold at Best-Buy and Radio Shack. Depending on your budget you could spend $100 to $1700 on a single pair, although $1700 may be a little steep for Ham Radio use only. You would be absolutely amazed at the detail and separation you can get with a good set of over the ear dynamic headphones. You could get a pair of AudioTechnia ATH-AD7000 for about $90.00 from Amazon.com They are called Open OTH (Over The Ear) Headphones that are amazingly comfortable and because they are "open" you can still hear what's going on around you. Ultrasone is another manufacturer I would highly recommend. I have a set of their Proline 2500 headphones that are my daily go-to phones that I can wear for several hours at a time and not get fatigued or a headache. Another company you may want to look at is Beyerdynamic, they make Headphones and Broadcast headsets all of which are absolutely amazing at all kinds of price points.
Audio Technia -
Check out a website called http://www.head-fi.org/ they are a huge forum dedicated to headphones and gear for listening to them. They have tons of reviews and members and there are bound to be at least a few HAM's on there that could answer your questions
Another site to check out would be http://www.headphone.com/ which is a company called HeadRoom under their headphones for sale they have Frequency Charts for each of the headphones that they sell.
Last but not least my personal favorite would be Todd the Vinyl Junkie http://www.ttvj.com/index.php?main_page=index, give them a call and ask to speak to Todd if he wasn't the one answering the phone already. Tell him what you are looking to do and he can offer a number of options and will bend over backwards to get you something that suits your needs and budget. And if you want to try out before you buy and ask really nice he might send you a loner pair(s)for a week or so for free, yes he really is that nice. Not too many people like him around anymore. He actually lent me a $2000 pair just so I could get an idea of what they sounded like. He's really that cool.
Good Luck with whatever choice you may make and enjoy. :>)
I got my H10-30's (Dual Plug) working with a 706MkIIG. I bought the two panel mount jacks from Arizona aviation supply and mounted them in a small project box with a PTT switch. I used a cat-5 cable and cut one end off and wired it up to the jacks and PTT switch in accordance with the pinout for the modular jack on the 706. Everything you need is in the modular jack (PTT, Mic, Audio output). Plugged it in and hit the PTT, great audio and good signal reports from other hams!
One thing I noticed is when using the audio from the modular jack, it doesn't disconnect the rig speaker like if you plugged in using the actual headphone jack.