[TowerTalk] TowerTalk Digest, Vol 153, Issue 40

Mon Sep 14 22:22:37 EDT 2015

There are nearly always some open frame relays, like we used to use for 
antenna changeover, at hamfests.
The ceramic ones would do fine at 100W, or much more.   Even 600 ohm line 
doesn't have extreme voltages, under 1KV at a KW.
I can't find any on Google, but they are around, just a few $ each.
WL

-----Original Message----- 
From: towertalk-request at contesting.com
Sent: Monday, September 14, 2015 9:51 PM
To: towertalk at contesting.com
Subject: TowerTalk Digest, Vol 153, Issue 40

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Today's Topics:

   1. Re: G-2800DXA Resistance readings (john at kk9a.com)
   2. Re: G-2800DXA Resistance readings (Mark Pride)
   3. Looking for good source of 20 ft mast (Stephen Davis)
   4. Re: Looking for good source of 20 ft mast (Matthew King - KK4CPS)
   5. Re: Looking for good source of 20 ft mast (john at kk9a.com)
   6. Re: Looking for good source of 20 ft mast (Gene Smar)
   7. relays for remote ladder line switch (Rik van Riel)

----------------------------------------------------------------------

Message: 1
Date: Mon, 14 Sep 2015 06:41:24 -0500
From: "john at kk9a.com" <john at kk9a.com>
To: towertalk at contesting.com
Subject: Re: [TowerTalk] G-2800DXA Resistance readings
Message-ID: <928b0d53747179eee9cb35e5e42618ab.squirrel at www11.qth.com>
Content-Type: text/plain;charset=iso-8859-1

I think D. Drake is correct.
http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=104&encProdID=E0526A9F285ECCF36F75CC3FEC992990&DivisionID=65&isArchived=0

Also as he mentioned the outdoor connector is sensitive moisture and it
would be the first thing to check. The rubber boot does little to stop
ingress.  When I had G-2800DXA rotators I sealed the boot with silicone
sealant.

John KK9A

To: towertalk at contesting.com
Subject: Re: [TowerTalk] G-2800DXA Resistance readings
From: Jim Brown <jim at audiosystemsgroup.com>
Reply-to: jim at audiosystemsgroup.com
Date: Sun, 13 Sep 2015 16:36:38 -0700

On Sun,9/13/2015 3:30 PM, D. Drake wrote:
Pins 1, 2 and 3 go to the 500 ohm position pot
with pin 2 being the wiper.  Also pin 3 is
grounded at the rotor.  So my measured resistance
from pin 1 to 3 was 506 ohms.  Pin 1 to 2 was 288
ohms and pin 2 to 3 was 221 ohms with the rotor at
45 degrees at the full CCW position pin 1-2 was
502 ohms and at the CW stop pin 1-2 was 70 ohms.

Pins 4 and 5 go to the motor and with the rotor
not at a mechanical stop the resistance was 12
ohms

Hmmmm. That's exactly the opposite of the schematic I remember seeing
online, as well as opposite of their smaller rotator (GXE1000?). Pins 1
and 2 are the motor, 3, 4, and 5 is the position pot.

73, Jim K9YC

------------------------------

Message: 2
Date: Mon, 14 Sep 2015 11:55:19 +0000 (UTC)
From: Mark Pride <mpridesti at yahoo.com>
To: "jim at audiosystemsgroup.com" <jim at audiosystemsgroup.com>,
"towertalk at contesting.com" <towertalk at contesting.com>
Subject: Re: [TowerTalk] G-2800DXA Resistance readings
Message-ID:
<1128435114.2080313.1442231719672.JavaMail.yahoo at mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

I concur with Dale's description.
G2800DXA model (with Cinch connector on control box)? - Also the same for 
the G1000DXA model.
1,2,3 are for the potentiometer
4,5 are the motor and 6 relates to the stops.
I?am happy to scan and supply the schematic.
Also note:? I have found their version control is very poor.? Moving from 
Cinch connectors to?Molex; FT1000D - always send the original manual when 
having it repaired as these radios had changes?that were not well?documented 
(but I digress).?Regards, Mark, K1RX ? ????
      From: Jim Brown <jim at audiosystemsgroup.com>
To: towertalk at contesting.com
Sent: Sunday, September 13, 2015 7:36 PM
Subject: Re: [TowerTalk] G-2800DXA Resistance readings

On Sun,9/13/2015 3:30 PM, D. Drake wrote:
> Pins 1, 2 and 3 go to the 500 ohm position pot
> with pin 2 being the wiper.? Also pin 3 is
> grounded at the rotor.? So my measured resistance
> from pin 1 to 3 was 506 ohms.? Pin 1 to 2 was 288
> ohms and pin 2 to 3 was 221 ohms with the rotor at
> 45 degrees at the full CCW position pin 1-2 was
> 502 ohms and at the CW stop pin 1-2 was 70 ohms.
>
>?
>
> Pins 4 and 5 go to the motor and with the rotor
> not at a mechanical stop the resistance was 12
> ohms

Hmmmm. That's exactly the opposite of the schematic I remember seeing
online, as well as opposite of their smaller rotator (GXE1000?). Pins 1
and 2 are the motor, 3, 4, and 5 is the position pot.

73, Jim K9YC

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Message: 3
Date: Mon, 14 Sep 2015 13:33:37 -0400
From: Stephen Davis <sdavis at davisrf.com>
To: "towertalk at contesting.com" <towertalk at contesting.com>
Subject: [TowerTalk] Looking for good source of 20 ft mast
Message-ID: <8E7EC06E-97C5-4C3E-8732-41477E13353F at davisrf.com>
Content-Type: text/plain; charset=us-ascii

Hello all

Specs :   20 ft. 2" O.D. .50" wall chrome moly

Yep, .5 "  !

Tnx a lot.  73. Steve. K1PEK

Steve Davis
Senior RF Cable Design Engr.
& Founder
DAVIS RF Co. a  division of
Orion Wire Co., Inc.
Tel: 978-369-1738
     ALSO: Davis Rope & Cable             Assembly Co., LLC:
      Design Engrs, Distribution

>

------------------------------

Message: 4
Date: Mon, 14 Sep 2015 16:48:51 -0400
From: Matthew King - KK4CPS <KK4CPS at gmail.com>
To: Stephen Davis <sdavis at davisrf.com>
Cc: "towertalk at contesting.com" <towertalk at contesting.com>
Subject: Re: [TowerTalk] Looking for good source of 20 ft mast
Message-ID:
<CAKs+UskMdpdpEjry4xeHL-hAQJZnJRvm=43wBWv0T+3qj9=E4w at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

I would think your local(ish) steel yard is probably your best bet for that.

That's gonna be a beast! What's it going in/on? What's going on it to
require such a specification, just for curiosity's sake?

73 es GL

Matt
KK4CPS

On Mon, Sep 14, 2015 at 1:33 PM, Stephen Davis <sdavis at davisrf.com> wrote:

> Hello all
>
> Specs :   20 ft. 2" O.D. .50" wall chrome moly
>
> Yep, .5 "  !
>
> Tnx a lot.  73. Steve. K1PEK
>
> Steve Davis
> Senior RF Cable Design Engr.
> & Founder
> DAVIS RF Co. a  division of
> Orion Wire Co., Inc.
> Tel: 978-369-1738
>      ALSO: Davis Rope & Cable             Assembly Co., LLC:
>       Design Engrs, Distribution
>
>
>
>
> >
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>

------------------------------

Message: 5
Date: Mon, 14 Sep 2015 18:10:41 -0400
From: <john at kk9a.com>
To: <towertalk at contesting.com>
Subject: Re: [TowerTalk] Looking for good source of 20 ft mast
Message-ID: <004301d0ef3a$3225e3f0$9671abd0$@com>
Content-Type: text/plain; charset="us-ascii"

That is probably a difficult wall thickness to find and you may have to go
to solid 4130 if you insist on using that diameter and need that much
strength. 3" mast is stronger per pound and so much nicer to climb and clamp
to.  I have not used a 2" mast in decades.

John KK9A

To: "towertalk at contesting.com" <towertalk at contesting.com>
Subject: [TowerTalk] Looking for good source of 20 ft mast
From: Stephen Davis <sdavis at davisrf.com>
Date: Mon, 14 Sep 2015 13:33:37 -0400
List-post: <towertalk at contesting.com">mailto:towertalk at contesting.com>
Hello all

Specs :   20 ft. 2" O.D. .50" wall chrome moly

Yep, .5 "  !

Tnx a lot.  73. Steve. K1PEK

Steve Davis
Senior RF Cable Design Engr.
& Founder
DAVIS RF Co. a  division of
Orion Wire Co., Inc.
Tel: 978-369-1738
     ALSO: Davis Rope & Cable             Assembly Co., LLC:
      Design Engrs, Distribution

------------------------------

Message: 6
Date: Mon, 14 Sep 2015 20:29:35 -0400
From: "Gene Smar" <ersmar at verizon.net>
To: "'Stephen Davis'" <sdavis at davisrf.com>, <towertalk at contesting.com>
Subject: Re: [TowerTalk] Looking for good source of 20 ft mast
Message-ID: <001101d0ef4d$9ca56670$d5f03350$@verizon.net>
Content-Type: text/plain; charset=US-ASCII

Steve:

     I bought my 2"X1/4" CM mast from Special Metals, Inc. 6406 South
Eastern Oklahoma City, OK 73149;  Sales: Joe Varva 800-727-7177.  That was
in 2001 so neither the company nor Joe nor the number might be around
anymore.  Good luck.

73 de
Gene Smar  AD3F

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
Stephen Davis
Sent: Monday, September 14, 2015 1:34 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Looking for good source of 20 ft mast

Hello all

Specs :   20 ft. 2" O.D. .50" wall chrome moly

Yep, .5 "  !

Tnx a lot.  73. Steve. K1PEK

Steve Davis
Senior RF Cable Design Engr.
& Founder
DAVIS RF Co. a  division of
Orion Wire Co., Inc.
Tel: 978-369-1738
     ALSO: Davis Rope & Cable             Assembly Co., LLC:
      Design Engrs, Distribution

>
_______________________________________________

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TowerTalk mailing list
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------------------------------

Message: 7
Date: Mon, 14 Sep 2015 21:51:27 -0400
From: Rik van Riel <riel at surriel.com>
To: towertalk at contesting.com
Subject: [TowerTalk] relays for remote ladder line switch
Message-ID: <55F7799F.1000603 at surriel.com>
Content-Type: text/plain; charset=utf-8

Hello,

I am considering building a remote ladder line switch using W199X-12
relays, which are open frame DPDT with 1600V breakdown voltage between
open contacts, 2200V between poles and coil/contact.

I run with 100W power.

Does anybody have opinions on relays like those, experience with them,
or good experiences with other relays that you think I should
consider instead?

I am looking at switching between two lazy H antennas (one east/west,
the other north/south) and maybe some doublets for lower bands.

The plan is to have each antenna switched either to a 4:1 balun, or
to ground. Would it make more sense to leave the unused antennas
ungrounded, or discharge static through 1M resistors?

thank you,

Rik AB1KW
-- 
All rights reversed.

------------------------------

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End of TowerTalk Digest, Vol 153, Issue 40
****************************************** 