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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>>
>>
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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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