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Re: [TowerTalk] TowerTalk Digest, Vol 97, Issue 2

To: towertalk@contesting.com
Subject: Re: [TowerTalk] TowerTalk Digest, Vol 97, Issue 2
From: Bud Kozloff <W1NSK@Hotmail.com>
Date: Sun, 2 Jan 2011 11:41:37 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I have a 15 yr. old  A4S w/40mtr add on. Here is the link to the manual:

http://www.cushcraftamateur.com/pdffiles/A4S.pdf

Bud
W1NSK

On 1/2/2011 10:29 AM, towertalk-request@contesting.com wrote:
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> Today's Topics:
>
>     1. 1/4w matching, Common mode chokes and BAL-UN (Jim Thomson)
>     2. 1980s Cushcraft A4 (mikflathead@aol.com)
>     3. RG 303 (dave arruzza)
>     4. Re: 1980s Cushcraft A4 (Jim W7RY)
>     5. Re: RG 303 (Rik van Riel)
>     6. Re: RG 303 (Pete Smith)
>     7. Re: Recommended Coaxial Surge Protector for HF (Rick Stealey)
>     8. Re: 1980s Cushcraft A4 (Jack Brindle)
>     9. Re: 1980s Cushcraft A4 (Al Williams)
>    10. Re: 1980s Cushcraft A4 (W7RIS)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 2 Jan 2011 02:46:56 -0800
> From: "Jim Thomson"<jim.thom@telus.net>
> Subject: [TowerTalk] 1/4w matching, Common mode chokes and BAL-UN
> To:<towertalk@contesting.com>
> Message-ID:<5C5A80A600EA46D389E3D49F9AA1AF35@JimboPC>
> Content-Type: text/plain;     charset="iso-8859-1"
>
> Date: Fri, 31 Dec 2010 20:05:57 +0000
> From: Steve Hunt<steve@karinya.net>
> Subject: Re: [TowerTalk] 1/4w matching, Common mode chokes and BAL-UN
>
> I have some modeled examples on my web site which illustrate the effect
> Jim [K9YC] is talking about. Take a look at the section "Why reactive chokes
> are undesirable" on this page:
> http://www.karinya.net/g3txq/chokes/
>
> The section finishes: "We conclude that a high value Resistive choke is
> the safe option for all scenarios. We also conclude that Rules-of-Thumb
> which equate the required choke impedance to some multiple of the
> differential-mode load impedance are unsound."
>
> 73,
> Steve G3TXQ
>
> ##  excellent info. My conclusion is... for a monoband yagi set up, use a 1/4 
>  or
> 3/4 wave of coax  from DE  to tower... IF possible.. or close to it.  Grnd 
> braid
> at top of tower or on mast.  Or grnd braid  via the remote switch box, if 
> remote switch
> box located at top of  tower, or on mast.  OK, then use a balun at the 
> DE....that is  mostly resistive.
> IF the balun is mostly resistive, the combo of a phys 1/4 wave  coax [x .98]  
> + resistive balun
> = excellent combo.  I can pull that off on 20-17-15m.  Can't be done on 
> 80-40m. Since my
> remote switch box is 1/2 way up the mast, a line isolator will be located at 
> the Input of the remote
> switch box.  The line isolator is just 393 wrapped around some type 31 
> cores...with connector's
> on both ends.  It's job is to ...'clean up'  any residual CM currents, b4 the 
> single coax heads down the
> tower.  Braid of single coax is  bonded to  base of tower /gnd sytem  via 
> lightning arrestor.
>
> ## Coax then routed 75'  along the grnd to just inside of  basement..and 
> terminates on a 2nd
> lightning arrestor..which is bolted to the SPG [large sheet of 1/4" thick AL 
> plate].  More coax to LP
> filter [also bolted to SPG plate], then more coax to a 2nd line isolator.... 
> then more coax to
> wattmeter coupler/amp etc. Both line isolators are inside plastic nema box's, 
> with type 31 cores
> suspended in mid air inside  the nema  box. [to minimize stray C] .   If all 
> that doesn't do it... I give up.
>
> later... Jim  VE7RF
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 01 Jan 2011 15:22:37 -0500
> From: mikflathead@aol.com
> Subject: [TowerTalk] 1980s Cushcraft A4
> To: towertalk@contesting.com
> Message-ID:<8CD7808C3DEB53B-FBC-21ADC@webmail-d033.sysops.aol.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
>
>
>   I acquired a late 70 A4 off a friend late dad. The center of the driven 
> element is a black insulated material about 2 inches in diameter that the U 
> bolts mount to the boom. There are two 1/4 20 tapped holes that I assume were 
> to mount the feed line. As you might have determined I do not have the 
> instruction manual. Can I use two brass bolts to connect the feed line to? 
> How are they making connection to the tubing? It evidently worked as this was 
> up for almost 30 years. Thanks Mike
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 1 Jan 2011 19:38:27 -0800 (PST)
> From: dave arruzza<w1ctn@yahoo.com>
> Subject: [TowerTalk] RG 303
> To: towertalk@contesting.com
> Message-ID:<980402.78546.qm@web38208.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> To all:
> I have been searching the internet for suppliers of RG303 coaxial.
> I am building a few choke baluns for my station.
>
> Does anyone have a small volume supplier of this cable? I don't need a 1000 
> foot spool for the number of baluns I am building.
>
> 73 es TIA
> Happy New Year
> Dave
> W1CTN
> Radio Ansonia
>
>
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 2 Jan 2011 07:16:50 -0800
> From: "Jim W7RY"<w7ry@inbox.com>
> Subject: Re: [TowerTalk] 1980s Cushcraft A4
> To:<towertalk@contesting.com>,        <mikflathead@aol.com>
> Message-ID:<3CDCB6DF0C524129885A6AF9CADAA898@Laptop>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>       reply-type=original
>
>
> Most likely an ATB-34. Should be a manual on line.
> 73
> Jim W7RY
>
>
> --------------------------------------------------
> From:<mikflathead@aol.com>
> Sent: Saturday, January 01, 2011 12:22 PM
> To:<towertalk@contesting.com>
> Subject: [TowerTalk] 1980s Cushcraft A4
>
>>
>>
>> I acquired a late 70 A4 off a friend late dad. The center of the driven
>> element is a black insulated material about 2 inches in diameter that the
>> U bolts mount to the boom. There are two 1/4 20 tapped holes that I assume
>> were to mount the feed line. As you might have determined I do not have
>> the instruction manual. Can I use two brass bolts to connect the feed line
>> to? How are they making connection to the tubing? It evidently worked as
>> this was up for almost 30 years. Thanks Mike
>>
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>>
>>
>> -----
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>>
>
> ------------------------------
>
> Message: 5
> Date: Sun, 02 Jan 2011 10:49:42 -0500
> From: Rik van Riel<riel@surriel.com>
> Subject: Re: [TowerTalk] RG 303
> To: towertalk@contesting.com
> Message-ID:<4D209E96.9070809@surriel.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 01/01/2011 10:38 PM, dave arruzza wrote:
>> To all:
>> I have been searching the internet for suppliers of RG303 coaxial.
>> I am building a few choke baluns for my station.
>>
>> Does anyone have a small volume supplier of this cable? I don't need a 1000 
>> foot spool for the number of baluns I am building.
> Small volumes of RG303 seem to be exorbitantly expensive,
> with several shops charging several dollars per foot.
>
> I did find one seller with 75 cents/foot:
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120666066468
>

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