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What is the meaning of transmission-freq-hz?

Postby vanosten » Sat Apr 13, 2019 4:11 pm

Hi

What is the meaning of /sim/multiplay/transmission-freq-hz? When looking at the values submitted, I see values like 118500000. However I would have guessed more something like 10 (i.e. sending packages every 0.1 seconds).

Rick
Maintaining osm2city. Contributing with ground attack stuff to the OPRF FlightGear military-simulation community.
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Re: What is the meaning of transmission-freq-hz?  

Postby wkitty42 » Sat Apr 13, 2019 5:14 pm

that looks like the transmission frequency of a radio... since it is in Hz, one would need to multiply it by 0.0001 to get Mhz or 0.0000001 to get Ghz...

if you're just now seeing this, i suspect it is due to the recent work on FGCom and the MP protocol so that the radios will work better over MP...
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: What is the meaning of transmission-freq-hz?

Postby WoodSTokk » Sun Apr 14, 2019 11:47 pm

wkitty42 wrote in Sat Apr 13, 2019 5:14 pm:…, one would need to multiply it by 0.0001 to get Mhz or 0.0000001 to get Ghz...


10 times is deka (greek: 10)
100 times is hekto (greek: 100)
1,000 times is kilo (greek: 1000)
1,000,000 times is mega (greek: great)
1,000,000,000 times is giga (greek: giant)

multiply with .001 to get kHz
multiply with .000001 to get MHz
multiply with .000000001 to get GHz

PS: want write greek words but the forum/database dont accept it
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Re: What is the meaning of transmission-freq-hz?

Postby wkitty42 » Mon Apr 15, 2019 2:12 am

oops! my math was off but i hope that it still helped some how... old age and meds, ya know?? :)
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: What is the meaning of transmission-freq-hz?

Postby Richard » Mon Apr 15, 2019 4:58 am

vanosten wrote in Sat Apr 13, 2019 4:11 pm:What is the meaning of /sim/multiplay/transmission-freq-hz? When looking at the values submitted, I see values like 118500000. However I would have guessed more something like 10 (i.e. sending packages every 0.1 seconds).


It actually seems to have no meaning and could possibly be removed.

It has a default value set in defaults.xml and the only current usage I can find relates to HLA. This property first appeared 12 years ago and appears to be related to the radio frequency selected possibly as part of the multiplayer chat dialog that isn't used anymore (or maybe was never used).

Recently I added support into the built in FGCom for setting sim/multiplay/comm-transmit-frequency-hz when push to talk is active on a COMM frequency.
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Re: What is the meaning of transmission-freq-hz?

Postby wkitty42 » Mon Apr 15, 2019 4:33 pm

ahhh... i was thinking it was your's, richard... thanks for the clarification, sir :)
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: What is the meaning of transmission-freq-hz?

Postby Richard » Tue Apr 16, 2019 8:27 pm

Unless there are objection I'm going to remove /sim/multiplay/transmission-freq-hz from defaults and change it to not be transmitted
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Re: What is the meaning of transmission-freq-hz?

Postby mickybadia » Tue Apr 16, 2019 8:42 pm

As I said in passing elsewhere, the only person you might just barely expect an objection from is an OpenRadar developer, which does encode this property, but to my knowledge never reads it anywhere.
So I would say go ahead, and you thereby recover the few bytes you had to use to encode the new (PTT-triggered) one to the Hz. So I feel less bad about pressing you to ;-)
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Re: What is the meaning of transmission-freq-hz?

Postby sim » Sat Apr 20, 2019 9:52 am

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