[ARC5] A-10 Radios
Michael Bittner
mmab at cox.net
Tue Jul 10 20:57:33 EDT 2018
One of the UK correspondents on one of these lists once remarked that their "Rotaries" (Traffic Circle in the USA) give one a sense of the British sense of humor.
The Doppler shift remark sounds like it came from a typical Tom Kneitel column. The guy always added some acerbic humor to his columns. Like the time he answered a reader who wanted to know why AM radio stations went dead every time he drove through a tunnel. Kneitel's answer, "Stop driving through tunnels, you are a menace to AM radio stations".
Mike, W6MAB
----- Original Message -----
From: Tom Lee
To: arc5 at mailman.qth.net
Sent: Tuesday, July 10, 2018 16:49
Subject: Re: [ARC5] A-10 Radios
That's hilarious! Next time I get lost driving, I'll explain to my wife that I'm just trying to minimize Doppler shift...
--Tom
--
Prof. Thomas H. Lee
Allen Bldg., CIS-205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu
650-725-3383 (public fax; no confidential information, please) On 7/10/2018 4:46 PM, Robert Eleazer wrote:
I guess it was back in the early 70's when one of the magazines, Popular Electronics, Popular Mechanics, etc, had a question and answer page where someone asked about the flutter you hear on AM broadcast radio when driving
The answer was: "This is due to the Doppler effect and it is a reason why circular beltways are popular for driving in cities, since the curving path minimizes Doppler shift."
All of the other answers that month were similarly absurd - and it was not the April issue. The regular guy must have been on vacation.
Wayne
WB5WSV
----- Original Message -----
From: Jay Coward
To: kv6lee at gmail.com ; macklinbob at gmail.com
Cc: arc5 at mailman.qth.net ; releazer at earthlink.net
Sent: Tuesday, July 10, 2018 7:09 PM
Subject: Re: [ARC5] A-10 Radios
Hi Bart,
Isn't this also known as "picket fencing" from multipath reception?
Jay KE6PPF
-----Original Message-----
From: Bart Lee <kv6lee at gmail.com>
To: macklinbob <macklinbob at gmail.com>
Cc: To: ARC-5 <arc5 at mailman.qth.net>; Robert Eleazer <releazer at earthlink.net>
Sent: Tue, Jul 10, 2018 2:00 pm
Subject: Re: [ARC5] A-10 Radios
FM received by a mobile (or air mobile) vehicle can "washboard" the received signal as the moving vehicle hits the incoming radio waves. Car radios on FM frequently have this issue. Aviation AM may or may not have been selected to avoid this problem, at 135 MHz and below. AM was the way aviation radio started, so there was some lock-in, especially after Curtis LeMay selected single sideband for SAC in the early 1950s. SSB's power advantages may also have come into play. 73 de Bart, K6VK ##
-- --
Bart Lee , K6VK, CHRS, AWA, ARRL
Texts only to: 415 902 7168
www.bartlee.com
{KV6LEE(at)gmail(dot)com} ##
On Wed, Jul 4, 2018 at 5:31 PM K5MYJ <macklinbob at gmail.com> wrote:
The reason for the use of AM in aviation is you can hear when somone doubles. Not so with FM.
The reason of low band FM is to communicate with the troops on the ground.
I was in Korea in 1953. We used AT-6s for FAC operations. Our AT-6s had ARC-5 VHF radios.
The people on the ground had ARC-3s in jeeps.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message -----
From: Peter Gottlieb
To: Scott Johnson
Cc: arc5 at mailman.qth.net ; Robert Eleazer
Sent: Wednesday, July 04, 2018 2:45 PM
Subject: Re: [ARC5] A-10 Radios
In a practical sense for any of us the question might be whether in regular AM and FM use the radio performs any better than other radios. The answer is probably not.
Peter
On Jul 4, 2018, at 12:45 PM, Scott Johnson <scottjohnson1 at cox.net> wrote:
Most all USAF tactical assets now have the ARC-210, which covers all the military bands and modes from 30-512 MHz, and has built in ECCM and secure speech, as well as satcom capability (all with the proper antennas and switching, of course). It is an awesome radio, but at $100K a copy, not on my wish list. Like the ARC-164, it will probably soldier on for at least thirty years (it’s already about fifteen years old, but evolving, just like the -164)
Scott V. Johnson P.E. W7SVJ
Sunburst Engineering Partners
5111 E. Sharon Dr.
Scottsdale, AZ 85254-3636
H (602) 953-5779
C (480) 550-2358
scottjohnson1 at cox.net
scott.johnson at ieee.org
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of Robert Eleazer
Sent: Tuesday, July 3, 2018 9:55 AM
To: arc5 at mailman.qth.net
Subject: [ARC5] A-10 Radios
When I was at the Pentagon the idea was to get rid of the A-10 and use F-16's. The F-16 equipped with a weapons load comparable to an A-10 could do a very nice job of making sure no one got past the guard shack at the main gate of its home base.
The fear was that the A-10 was so slow that when the Warsaw Pact came through the Fulda Gap the A-10 would get hit on the first day of the war and although probably survive to make it home but we would not have time to repair it before the war was over.
Some on Congress said that if USAF got rid of the A-10 the US Army should take over the airplane, it being a much better "mud mover." The Army was terrified, saying that all their airplanes had to have at least two seats.
Then came Saddam's invasion of Kuwait and the A-10 was the machine to have. And when the war was over we had lost four A-10's and four F-16's So much for survivability concerns. A re-engining program was started for the A-10 a few years later. And the USSR went out of business on 25 Dec 1991; so much for the Fulda Gap concern
To some in the USAF was faced with either keeping the A-10 or buying the F-35 - and the F-35 won. I do not know if that insanity persists.
The A-10 would have at a minimum VHF AM Air Band (108-132 MHZ), UHF AM (220-400 MHZ), and low band FM (30-76 MHZ) radios. The ARC-114, ARC-115, and ARC-116 such as carried by US Army helicopters of the late 60's would do nicely but it no doubt has gear later than that.
Anyway, look it up yourself. The pilot's manual for the A-10 is available for free download here:
http://www.476vfightergroup.com/downloads.php?do=file&id=42
Wayne
WB5WSV
Virus-free. www.avg.com
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