Talk:QNH

qnh and qfe pages don't match. --Gbleem 16:54, 27 December 2005 (UTC)

I'm not sure how best to address it (this article, or in a new article with a cross reference with this one?), but QNH is also used in amateur radio, and has a totally different meaning. It's a special "QN" code defined by the American Radio Relay League (ARRL) on CW (morse code) traffic nets. In this context, QNH is transmitted by the net control station to mean "Your net frequency is high" -- suggesting that the other station tune his transmitter downwards in frequency a little in order to be more closely aligned with the frequency that the net control station is using. Sigikieran 20:02, 5 March 2007 (UTC)

Image?

Is this image useful in this article? Image:Aircraft altimeter.JPG.--DO11.10 00:10, 5 May 2007 (UTC)

Radio Comms

Article: A typical radio conversation may be:-

Pilot: Golf Whiskey Alpha Charlie Foxtrot, requesting Cotswold QNH ATC: Golf Charlie Fox, Cotswold QNH one-zero-one-three Pilot: QNH one-zero-one-three, Golf Charlie Fox

It "may" be, but in reality, it's not. Rather, if you're above the transition altitude, you'd have 29.92 set, and neither you nor the controller would care about the local altimeter setting.

If you're below the transition altitude and are under IFR, each time you're handed off to the next controller the new controller will provide you with a local altimeter.

Furthermore, if while under the same control you move into an area with a significantly different altimeter setting, the controller will give you an updated altimeter setting.

If you're under VFR with flight following, the controller will usually provide you with local altimeter settings.

Regardless, when transitioning from one center to another, in all three cases, it sounds like this:

Pilot (upon initial contact): Seattle Center, Diamond November 6 2 0 Alpha Victor with you at 9,000 feet. (only the last two numbers and the letters afterward are said after initial contact. Seattle Center: 2 0 Alpha Victor, initial contact. Continue flight planned route, squawk 29.83. Pilot: 2 0 Alpha Victor squawking 29.83. —Preceding unsigned comment added by 87.177.8.55 (talk) 16:10, 28 June 2008 (UTC)

Use of squawk in above paragraph is questionable. Squawk codes are radar transponder settings (4 digits). And as the article mentions, altimeter read outs don't usually include the decimal point -- or do some pilots read back that way sometimes? Best to go by what the regs actually say they should say. —Preceding unsigned comment added by 124.169.122.201 (talk) 09:38, 2 July 2008 (UTC)

Use of "squawk" wrong. "Squawk" never refers to the pressure setting. "Squawk 0 3 2 1" means to enter code 0321 on the radar transponder.

The US ATC phraseology is "<airfield name> altimeter <digit> <digit> <digit> <digit>." The four digits are the inches/tenths/hundredths of mercury column. The decimal is always omitted. — Preceding unsigned comment added by 75.208.234.143 (talk) 03:01, 5 December 2012 (UTC)

The "three" should be a "tree"?88.72.104.133 (talk) 23:04, 7 June 2014 (UTC)

references

This might help: http://www.auf.asn.au/groundschool/umodule3.html Ozy42 (talk) 21:19, 2 October 2009 (UTC)

Etymology

I have edited one paragraph and removed another dealing with the etymology of the term. This eliminates redundant trivia, and removes the sentence 'This was understood to mean, "I have a Question. What is the atmospheric pressure at Nil Height?"' which is almost certainly incorrect, and no reference is provided in any case.

I am tempted to chop the bit on mnemonics too for similar reasons, and the "radio conversation" on the grounds that it looks silly, but I'll exercise some restraint and leave those in for now. —Preceding unsigned comment added by 79.144.86.55 (talk) 13:15, 4 October 2009 (UTC)