m than the outside EDZ.
73,
Lyn, WØLEN
-Original Message-
From: Don Wilhelm [mailto:donw...@embarqmail.com]
Sent: Saturday, September 14, 2019 8:51 AM
To: l...@lnainc.com; 'Elecraft Reflector'
Subject: Re: [Elecraft] Rhombic antenna "gain"
Lyn,
Hopefully you do no
Hi Wes,
You forgot to mention that Chris VK5MC was only running 150 watts
output. His pattern dropped off drastically as the moon exited his
window. When I built my humongous 144 MHz array in 1979/80, I figured
that my window with VK5MC would be a bit wider with the added gain from
the 24 ya
I lived in Africa a long time ago in a game park so I had the opportunity
to run a 700 foot long wire and later two long wires in a V beam.
The gain was better than a yagi, the wires had lobes off them. I noticed
that I didn't suffer from much fading.
If you have space for a long wire or a v beam
7:25:39 AM
Subject: Re: [Elecraft] Rhombic antenna "gain"
Correct. USN had FRD-10's and USAF/US Army had FLR-9's.
Lesser know variant of the FRD-10 was called the "Pusher". We had one
out on Diego Garcia. About half the size of the FRD-10 iffen I reall correctly.
I was a lowly 2nd Lieutenant at Ft Monmouth in 1968. I was going thru a
tropo scatter class. I used to love to drop in to K2USA in that wooden
barracks building. I don't remember much except that it was waay cool
to me. I wonder if there are any pictures of the place online?
Dave K1WHS
On 9
Lyn,
Hopefully you do not trust that an antenna in the attic will not be
susceptible to lightning.
I would not use ANY antenna during a thunderstorm.
Shut down the station and ground all feedlines.
73,
Don W3FPR
On 9/14/2019 8:27 AM, Lyn Norstad wrote:
Prior to the HOA changes, I was limit
orms when the EDZ is disconnected.
Lyn, WØLEN
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Vic Rosenthal
Sent: Saturday, September 14, 2019 5:56 AM
To: Elecraft Reflector
Subject: Re: [Elecraft] Rhombic antenna "
Yes, that came to mind here too. I figure that somebody will eventually plant
beans and corn on the Bondville, IL site though.
Chuck KE9UW
c-haw...@illinois.edu
Sent from my iPad
> On Sep 13, 2019, at 10:42 PM, Arliss wrote:
>
> Or even longer:
>
> https://4.bp.blogspot.com/-UkbdbLQ-ofI/V4CW
I completed my 2-meter WAC by working VK5MC on December 3, 1982. Chris was using
a rhombic, IIRC, 50 wavelengths on a leg and more-or-less fixed on his rising
moon. I believe with some ropes he could "steer" one end to get a few minutes
more on another couple of days a month of use. Otherwise
Just a question of phasing it properly. Of course it would be hard to do for
multiple bands!
Victor 4X6GP
> On 14 Sep 2019, at 4:56, Fred Jensen wrote:
>
> Feed the termination power back into the antenna? Conservation of energy?
> [:-)
__
Just bring 600 ohm open line feedlines down from each end to a common point,
where you have a relay or two to switch the feed and the terminating resistor.
Then you can reverse it with a flip of the switch. Although transmit gain is
the same as bidirectional, you can cut the noise by 3 dB.
Vict
Correct. USN had FRD-10's and USAF/US Army had FLR-9's.
Lesser know variant of the FRD-10 was called the "Pusher". We had one
out on Diego Garcia. About half the size of the FRD-10 iffen I reall correctly.
I spent almost 5 1/2 years working at the one at NSGD Guam.
73, Todd KH2TJ
>Hi mike,
I guess they were used a many military sites. In 1984 I helped
install a 250w commercial VHF link from top of Mt. Balleyhoo (above
Dutch Harbor in the Aleutians) and there was the remains of many 90
foot wooden poles arrayed up in a valley on the side of the mountain
that was used by the milit
nt: Saturday, September 14, 2019 1:26:20 AM
Subject: Re: [Elecraft] Rhombic antenna "gain"
I still get a kick out of thinking that I worked INSIDE of the antenna! (Rota’s
FLR-9)
Si vis pacem, para bellum
Mike, W1USN
On Sep 13, 2019, at 8:45 PM, Jim Campbell wrote:
We also had E
Not true. The KFS receive site building and some antennas are still there and
being used for "something". In fact there is a web SDR hooked to the big log
periodic.
73,
Brian, K0DTJ
HMB, CA
>
> KFS -- all gone now, not even buildings are left.
__
On 9/13/2019 8:15 PM, donov...@starpower.net wrote:
> Its nearly impossible to hide those old Wullenweber arrays, even if they've
> been dismantled for nearly fifty years
The FCC's have all been dismantled.
73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
>From a Clearing in the Silicon For
On 9/13/2019 6:56 PM, Fred Jensen wrote:
> I think the Half Moon Bay stn was KFS. It's brother site was in the mud
> flats off of the Palo Alto shoreline in the Bay, all gone now. At least
> one of the KFS transmitters is now operating at KPH.
Ah yes, the PW-15, built for Press Wireless in the
On 9/13/2019 6:56 PM, Fred Jensen wrote:
> There was a small group of hams who either tried, or succeeded, in
> getting permission to put one of the remaining Delano Sterba's on 160
> [and maybe 80]. I'm not sure if they were successful,
As I remember it, it was the Sacramento Ham Club that got
On 9/13/2019 5:47 PM, Jim Brown wrote:
> There's another RX station along Rte 1 S of Half Moon Bay, with an
> associated TX station around Palo Alto.
KFS -- all gone now, not even buildings are left.
73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
>From a Clearing in the Silicon Forest
Beave
On 9/13/2019 5:45 PM, Jim Campbell wrote:
> We also had Elephant Cages later on. Funny no one has mentioned them.
They (we called them the "Type W") were the mainstay of the FCC's HFDF
system from the 1970s to several years after I retired in the mid-1990s.
Their function was directivity, not gai
On 9/13/2019 4:18 PM, donov...@starpower.net wrote:
> I visited many rhombic antenna farms many years ago (as far as I know
> they've now all been dismantled).
The Maritime Radio Historical Station KPH (ex-RCA) site in Bolinas, CA
may still have one up, but I'm not certain that it is still in s
Or even longer:
https://4.bp.blogspot.com/-UkbdbLQ-ofI/V4CWpqwJ9SI/E-Q/YtV82_PGUqg3j77n0OyOxp0A1LaL1-LowCLcB/s1600/crop-stonehenge-stones-set3.jpg
73, Arliss W7XU
On 9/13/2019 10:15 PM, donov...@starpower.net wrote:
Hi Chuck,
Its nearly impossible to hide those old Wullenweber arr
t;Jim Campbell"
Cc: elecraft@mailman.qth.net
Sent: Saturday, September 14, 2019 1:26:20 AM
Subject: Re: [Elecraft] Rhombic antenna "gain"
I still get a kick out of thinking that I worked INSIDE of the antenna! (Rota’s
FLR-9)
Si vis pacem, para bellum
Mike, W1USN
> On Sep 13,
arles j jr hawley"
To: "Jim Campbell"
Cc: elecraft@mailman.qth.net
Sent: Saturday, September 14, 2019 1:42:53 AM
Subject: Re: [Elecraft] Rhombic antenna "gain"
I was in the radio direction finding group at the U of IL in the early 60's
which had a Wullenweber s
A small correction. Delano, Dixon and further east Bethany were not VOA sites.
They were originally private broadcaster’s sites. I can’t remember which was
what but Bethany and Delano were CBS and NBC. Bethany was Crosley. Eventually
VOA took these sites over as commercial broadcasters found li
Symmetry? The whole show with rhombics is beamwidth and elevation
angle, not really gain, which has been pointed out in much of the
literature. A "perfect" rhombic will have an extremely narrow beamwidth
in the 10 to 15 deg range at HF [and if large enough, at MF as well].
Asymmetry will dis
Many of the VOA transmitters were 250 KW and ended up in religious SW
broadcast stations.
There was a small group of hams who either tried, or succeeded, in
getting permission to put one of the remaining Delano Sterba's on 160
[and maybe 80]. I'm not sure if they were successful, I do know th
Behalf Of Jim Campbell
>> Sent: Friday, September 13, 2019 17:21
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] Rhombic antenna "gain"
>>
>> In the late '50s I was stationed at a field station in Northern Germany that
>> was monitoring tr
:elecraft-boun...@mailman.qth.net> > <mailto:elecraft-boun...@mailman.qth.net>> On
>> Behalf Of Jim Campbell
>> Sent: Friday, September 13, 2019 17:21
>> To: elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] Rhombic anten
lman.qth.net
Subject: Re: [Elecraft] Rhombic antenna "gain"
We also had Elephant Cages later on. Funny no one has mentioned them. If you
want to see a real monster https://en.wikipedia.org/wiki/AN/FLR-9
Also known as a "Wullenweber" or AN/FLR-9.
Jim - W4BQP
On 9/13/2019
On 9/13/2019 4:18 PM, donov...@starpower.net wrote:
To compound the design compromises, the r hombic termination
resistor throws away nearly 3 dB of whatever gain it might achieve.
When our senior EE class toured Crosley's Mason, OH VOA site in 1964,
the engineers were quite proud of their mod
raft@mailman.qth.net
Subject: Re: [Elecraft] Rhombic antenna "gain"
In the late '50s I was stationed at a field station in Northern Germany that
was monitoring transmissions from the 'other side'. We were at a former WWII
German airfield and had an antenna farm comprised of rhomb
Many years ago W1AW used to have a big (6 wavelengths per leg as I
recall) rhombic for 20 meters pointed west. It was mainly used for the
code practice and bulletin transmissions. When the new 90-foot tower
with stacked monoband Yagis was installed we ran some A/B antenna tests
on the air and
In the late '50s I was stationed at a field station in Northern Germany
that was monitoring transmissions from the 'other side'. We were at a
former WWII German airfield and had an antenna farm comprised of
rhombics. I never bothered to count how many there were but I estimate
that there were m
Mike: You will need more than "a few tens of acres" for rhombics, their
beamwidth is so narrow that you will need an array of them. The
transmit site for KOK ["Los Angeles Radio" now SK and demolished] was
probably at least a square mile, likely more. Rhombics for the
point-2-point services,
Well, I'm not wealthy. But we do have 270 acres of forest-land covered
with nothing but trees. So a rhombic or two sounds really good, which
never occurred to me before. Thanks, Don!
Across the field from my shack, maybe 600', is a row of 90' pine
trees. More trees on either edge of the f
Mike: Rhombics can be operated either terminated or unterminated. If
unterminated, they are bi-directional with half the power in each lobe.
If terminated, the resistor absorbs half the power in the reverse lobe.
Either way, half your power goes the "wrong" way, either behind your
desired d
Maybe the termination was changed in later years. I was permanently
assigned to K2USA from '63-'65 (not bad duty for a ham). We ran
thousands of phone patches to/from SE Asia on that rhombic and the 20m
monobander @ 90 feet. I used to break into QSOs between two local VKs
chatting via ground wa
10:24:32 PM
Subject: Re: [Elecraft] Rhombic antenna "gain"
Can you expand on this, Ken, or if easier, a reference? I'm curious
what tradeoffs are made. I used a rhombic at Ft. Monmouth, NJ before
the Army base was closed in 2011, and used to boom into Europe and
Russia. It was
Can you expand on this, Ken, or if easier, a reference? I'm curious
what tradeoffs are made. I used a rhombic at Ft. Monmouth, NJ before
the Army base was closed in 2011, and used to boom into Europe and
Russia. It was amazing. I also got copies of WWII manuals on rhombic
construction while
Rhombic antennas derive their well-known gain by "throwing away" some of
the design's gain. Ditto for the infamous "inverted vee". Use is made of
the lobes from the four wires while disregarding others.
73 !
Ken Kopp - K0PP
__
Elecraft
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