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Today's Topics:
1. Re: Re: [Amps] antennas that are 1:1 vswr all over the band
(Bill L. Fuqua)
2. Re: Re: [Amps] antennas that are 1:1 vswr all over the band
(F5HRY)
3. Relays (Bob Maser)
4. Re: antennas that are 1:1 vswr all over the band (Will Matney)
5. RE: Relays (daniel hearn)
6. Re: Relays (Don Havlicek)
7. 1:1 vswr all over the band ....... stirred not shaken
(donii@sympatico.ca)
----------------------------------------------------------------------
Message: 1
Date: Thu, 23 Dec 2004 07:35:56 -0500
From: "Bill L. Fuqua"
Subject: Re: Re: [Amps] antennas that are 1:1 vswr all over the band
To: hgk@centurytel.net
Cc: amps@contesting.com
Message-ID: <1103805356.44ead6a4wlfuqu00@uky.edu>
Content-Type: text/plain; charset="UTF-8"
Beverage antenna is a directional receive only antenna. It is very ineffecient
but at lower frequencies where atmospheric noise is so high it does not matter.
73
Bill wa4lav
-----Original Message-----
From: Harry
To: amps@contesting.com
Date: Thu, 23 Dec 2004 07:11:00 -0500
Subject: Re: [Amps] antennas that are 1:1 vswr all over the band
There's also an antenna called a beverage that isn't a screwdriver. :)
Happy Holiday
Harry
R. Measures wrote:
> There's also a beverage called a screwdriver that isn't an antenna.
>
> On Dec 22, 2004, at 6:04 PM, Harry wrote:
>
>> Sure Peter
>> There's a popular mobile antenna called the screwdriver antenna.
>> http://www.qth.com/n7lyy/
>>
>> Harry
>>
>> donii@sympatico.ca wrote:
>>
>>> Gentlemen
>>> A while back as I was listening to two rag chews on 80 they mentioned
>>> some kind of antenna that was extremely expensive and that could
>>> adjust its length according to the frequency transmitted. This must
>>> have been for 20 and higher. I don't know anymore as I wasn't really
>>> paying attention. Anybody know of this type of antenna? Could it be
>>> done?
>>> Peter
>>> VE2FAR
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
>
>
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------------------------------
Message: 2
Date: Thu, 23 Dec 2004 13:33:06 -0000
From: "F5HRY"
Subject: Re: Re: [Amps] antennas that are 1:1 vswr all over the band
To:
Message-ID: <008401c4e8f4$0fa125e0$0400a8c0@F5HRYDAOULAS>
Content-Type: text/plain; charset="UTF-8"
There are also antennas that are neither beverages nor screwdrivers ...
Regarding beverages, please remind that they are also very useful
at higher frequencies, giving both azimut and elevation angle diversities
versus traditional beams. We are using 6 of them at FY5KE, even
on 10m, and are very pleased with the result. Of course low level
signals are hard to copy on beverages, so high a SFI is prefered !
73
Herve F5HRY
www.win-test.com
www.fy5ke.org
----- Original Message -----
From: "Bill L. Fuqua"
To:
Cc:
Sent: Thursday, December 23, 2004 12:35 PM
Subject: Re: Re: [Amps] antennas that are 1:1 vswr all over the band
Beverage antenna is a directional receive only antenna. It is very
ineffecient but at lower frequencies where atmospheric noise is so high it
does not matter.
73
Bill wa4lav
-----Original Message-----
From: Harry
To: amps@contesting.com
Date: Thu, 23 Dec 2004 07:11:00 -0500
Subject: Re: [Amps] antennas that are 1:1 vswr all over the band
There's also an antenna called a beverage that isn't a screwdriver. :)
Happy Holiday
Harry
R. Measures wrote:
> There's also a beverage called a screwdriver that isn't an antenna.
>
> On Dec 22, 2004, at 6:04 PM, Harry wrote:
>
>> Sure Peter
>> There's a popular mobile antenna called the screwdriver antenna.
>> http://www.qth.com/n7lyy/
>>
>> Harry
>>
>> donii@sympatico.ca wrote:
>>
>>> Gentlemen
>>> A while back as I was listening to two rag chews on 80 they mentioned
>>> some kind of antenna that was extremely expensive and that could
>>> adjust its length according to the frequency transmitted. This must
>>> have been for 20 and higher. I don't know anymore as I wasn't really
>>> paying attention. Anybody know of this type of antenna? Could it be
>>> done?
>>> Peter
>>> VE2FAR
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
>
>
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------------------------------
Message: 3
Date: Thu, 23 Dec 2004 10:12:07 -0500
From: "Bob Maser"
Subject: [Amps] Relays
To: "AMPS"
Message-ID: <016e01c4e901$c4f387f0$c8a0cf44@W6TR>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
This may be a little off tune for the AMPS reflector but I need help(people
that know me have said that for years). I am converting an old Collins
20V-3 broadcast transmitter and I need a relay to do some power cutback
switching. I happen to have 2 really nice heavy duty relays made by P & B
but they have 24VDC coils and, since the Collins rig doesn't have anything
close to 24V, I would have to use a separate power supply just for these
relays. But then I noticed on the P & B data sheets that the coil
resistance and current draw are the same for a 24VDC relay coil and a 120VAC
relay coil. 288 ohms/84ma and 290 ohms/85ma respectively. Does this mean
that I can apply 120VAC to my 24VDC relay coil? How can this be? This
violates Ohms Law. I aint about to try this until I've checked with you
Elmers.
Bob, W6TR
------------------------------
Message: 4
Date: Thu, 23 Dec 2004 10:17:53 -0500
From: Will Matney
Subject: Re: [Amps] antennas that are 1:1 vswr all over the band
To: "amps@contesting.com"
Message-ID: <41CAE1A1.1020704@ezwv.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I think Tom Collins invented that didn't he?
R.Measures wrote:
> There's also a beverage called a screwdriver that isn't an antenna.
>
> On Dec 22, 2004, at 6:04 PM, Harry wrote:
>
>> Sure Peter
>> There's a popular mobile antenna called the screwdriver antenna.
>> http://www.qth.com/n7lyy/
>>
>> Harry
>>
>> donii@sympatico.ca wrote:
>>
>>> Gentlemen
>>> A while back as I was listening to two rag chews on 80 they
>>> mentioned some kind of antenna that was extremely expensive and that
>>> could adjust its length according to the frequency transmitted. This
>>> must have been for 20 and higher. I don't know anymore as I wasn't
>>> really paying attention. Anybody know of this type of antenna? Could
>>> it be done?
>>> Peter
>>> VE2FAR
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
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> This message was checked by NOD32 antivirus system.
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>
>
>
------------------------------
Message: 5
Date: Thu, 23 Dec 2004 07:44:17 -0800
From: "daniel hearn"
Subject: RE: [Amps] Relays
To: "Bob Maser" , "AMPS"
Message-ID:
Content-Type: text/plain; charset="Windows-1252"
AC relays have a different magnetic core structure than DC so your idea will
not work. You could rectify the 120 to DC then use a resistor in series with
the coil to give 24DC at the coil. It would only require a diode, a
capacitor of a few mfd and a resistor. The whole thing could be quite small.
73, Dan. N5AR
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of Bob Maser
Sent: Thursday, December 23, 2004 7:12 AM
To: AMPS
Subject: [Amps] Relays
This may be a little off tune for the AMPS reflector but I need help(people
that know me have said that for years). I am converting an old Collins
20V-3 broadcast transmitter and I need a relay to do some power cutback
switching. I happen to have 2 really nice heavy duty relays made by P & B
but they have 24VDC coils and, since the Collins rig doesn't have anything
close to 24V, I would have to use a separate power supply just for these
relays. But then I noticed on the P & B data sheets that the coil
resistance and current draw are the same for a 24VDC relay coil and a 120VAC
relay coil. 288 ohms/84ma and 290 ohms/85ma respectively. Does this mean
that I can apply 120VAC to my 24VDC relay coil? How can this be? This
violates Ohms Law. I aint about to try this until I've checked with you
Elmers.
Bob, W6TR
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http://lists.contesting.com/mailman/listinfo/amps
------------------------------
Message: 6
Date: Thu, 23 Dec 2004 10:46:35 -0500
From: Don Havlicek
Subject: Re: [Amps] Relays
To: Bob Maser
Cc: AMPS
Message-ID: <41CAE85B.7060604@thepoint.net>
Content-Type: text/plain; charset=windows-1252; format=flowed
Bob,
Somewhere inside that box, I'm sure you can find 6.3v AC .... why not
build a simple voltage doubler circuit to drive those relays? Most 24v
DC relays will close on 12+ volts. It's worth a try!
Don
N8DE
Bob Maser wrote:
> This may be a little off tune for the AMPS reflector but I need
> help(people that know me have said that for years). I am converting an
> old Collins 20V-3 broadcast transmitter and I need a relay to do some
> power cutback switching. I happen to have 2 really nice heavy duty
> relays made by P & B but they have 24VDC coils and, since the Collins
> rig doesn't have anything close to 24V, I would have to use a separate
> power supply just for these relays. But then I noticed on the P & B
> data sheets that the coil resistance and current draw are the same for a
> 24VDC relay coil and a 120VAC relay coil. 288 ohms/84ma and 290
> ohms/85ma respectively. Does this mean that I can apply 120VAC to my
> 24VDC relay coil? How can this be? This violates Ohms Law. I aint
> about to try this until I've checked with you Elmers.
>
> Bob, W6TR
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
------------------------------
Message: 7
Date: Thu, 23 Dec 2004 11:17:36 -0500
From: "donii@sympatico.ca"
Subject: [Amps] 1:1 vswr all over the band ....... stirred not shaken
To: "amps@contesting.com"
Message-ID: <41CAEFA0.601@sympatico.ca>
Content-Type: text/plain; charset=us-ascii; format=flowed
Was that the same Collins that made the ham rigs, hic? Maybe his brother?
During the holiday season when I operate with my special beverages my
swr runs sky high!!
Again Thanks to all who helped me ........seriously and less seriously.
Merry Christmes and a hHappy N.Y.
Peter
VE2FAR
------------------------------
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End of Amps Digest, Vol 24, Issue 40
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