[ARC5] A-10 Radios
Tom Lee
tomlee at ee.stanford.edu
Tue Jul 10 19:49:20 EDT 2018
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 <mailto:jcoward5452 at aol.com>
> *To:* kv6lee at gmail.com <mailto:kv6lee at gmail.com> ;
> macklinbob at gmail.com <mailto:macklinbob at gmail.com>
> *Cc:* arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> ;
> releazer at earthlink.net <mailto: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 <mailto:kv6lee at gmail.com>>
> To: macklinbob <macklinbob at gmail.com <mailto:macklinbob at gmail.com>>
> Cc: To: ARC-5 <arc5 at mailman.qth.net
> <mailto:arc5 at mailman.qth.net>>; Robert Eleazer
> <releazer at earthlink.net <mailto: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 <http://www.bartlee.com/>
>
> {KV6LEE(at)gmail(dot)com} ##
>
>
>
>
> On Wed, Jul 4, 2018 at 5:31 PM K5MYJ <macklinbob at gmail.com
> <mailto: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 <mailto:kb2vtl at gmail.com>
> *To:* Scott Johnson <mailto:scottjohnson1 at cox.net>
> *Cc:* arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> ;
> Robert Eleazer <mailto:releazer at earthlink.net>
> *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 <mailto: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
> <mailto:scottjohnson1 at cox.net>scottjohnson1 at cox.net
> <mailto:scottjohnson1 at cox.net>
> <mailto:scott.johnson at ieee.org>scott.johnson at ieee.org
> <mailto:scott.johnson at ieee.org>
> *From:* arc5-bounces at mailman.qth.net
> <mailto:arc5-bounces at mailman.qth.net>
> <arc5-bounces at mailman.qth.net
> <mailto: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 <mailto: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
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