Chances are if you're in the UK (in my limited experience), you would have the low impedance NATO setup.

I replaced the original mic on my SPH4 (Civilian) with an electret 2 years ago. It was ok but changed recently to a David Clark Dynamic amplified mic (from 10.34 headset) and it is a lot easier for ATC to understand your voice in a noisy cockpit. :D

Why are you buying one? won't you be supplied with one?:confused:

Thanks for your replies,

I`m not paying for it just been asked to source one.

We had an Alpha Eagle helmet on order for about 7 months but they keep mucking us about.

I`m looking at the Gallet LH250 helmet at the minute. Just trying to get the comms sorted out.

have you contacted headset services at shoreham? tell them exactly what you need and they can get you the correct helmet, mike etc.

Low impedence = around 8 - 17 ohms

High impedence = around 300 ohms

Civil aircraft VHF radios use high impedence, as do UHF CB type radios.

Military aircraft use low impedence setups.

Low impedence mics, M87 and M101, can be amplified to high impedence with a plug in amp. Both are dynamic mics.

Electret mics tend to be high impedence. Stand to be corrected.

Seems to be important in multi crew to have every one the same. Seems electricity, like water, takes the easiest way, so whoever has the lowest impedence gets all the electricity.

Thats how it was explained to me (I think)

Best bet? Have a look at what everyone else is using and get the same.

Gentex Helmet Wanted
 

Hi Guys,

Im after a helmet either a gentex SPH5 OR Alpha, locally in Australia would be preferred and in good condition.

I know they are like as rare as rocking horse S*%T but one of you guys may know where i can get a hold of one

Cheers

BT

belly tank,

Try www.fieldair.com.au classifieds section.

Seriously though, consider buying new, the cost difference is not huge and you know what you are getting.

www.flightsuits.com are worth a look - bought new from them for what some people pay for used.

Woz one advertised in the aviation trader this month.

Currawong,

Thanks champ. i will have a look. i wanted one for my crewie, i will most likely go a new one that way you know what your getting. but thanks guys for the info. i Bought a Alpha new from a distributer here they are a good helmet but it took me 6 months to get it after being ordered. I cannot wait this long this time.

cheers

SPH5
 

Mark mackay at helipro in nz sells reconditioned SPH 4b's and 5's.
for around 900 to 1000 nzd

His phone no. is ++ 64 27 245 9490.

There is currently a recon SPH4B at www.trademe.co.nz going for $900nzd

I know what you mean about flightsuits, i've given up dealing with them.

good luck mate.

woops, you don\'t mean flight suits at all.
As for that alpha dealer, do you know there are 2 alpha dist. in aussie now??

Thanks guys . ive located one by the looks of it!

cheers and thanks for your help

I have one for sale, but the price would choke a horse. I just built on from a new SPH-4B. Sent it to www.flightsuits.com and had the earphones and mike replaced to be adaptable with civilian Helicopters. Next it went to www.smokinpaint.com Where it was painted a beautiful Baby Blue and dual visors installed. Last was the addition of a lip light in both green and xenon by www.seitzinc.com
So with all the money in it, I cant even advertise it for sale. Guess I will have to enjoy it. (But for $1200 U.S you can have it and a new Blue Nomex flight suit........)

Also if you want to find helmets try www.ebay.com I have seen a few there also.

BT,

I have a SPH 5 Medium in good nick it you are interested, check your PMs.

Or if anyone else is interested AU $1000.

Spare visors and assorted bits also.

Hey Wiz,
I hope the one in the Aviation Trader isn't the same piece of crap you have bouncing around the floor of your Landcruiser?:}

Belly Tank,
I just did a quick search, there are a few listed on EBAY.

thats a bit harsh IJ. My kids spent hours working on that piece of art. ;)
currently in nagotiations for a replacement...........that will probably recieve the same treatment from the monst........er......kids. :\

Gotta admit Wiz, I did like the bullet hole effect. :cool:

Me too. I think they'll be added to the new one. ;)

Helmet Choice
 

Hi all,
Ive been looking around for a helmet to replace my old gentex. Im seriously looking at the CGF Gallet models but cant find any one who has one. Any one had any experience with these?

Cheers and keep it upright!!

TM

helmet choice
 

The GALLET helmet is fantastic its comfotable and light , much better tha the other choices .