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Charlie Cunningham | 18 May 2013 19:35
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Re: Topband: Thanks!

Hi, Dean

Well good luck in your hunt.

Over the years I've found many uses for various Fair-Rite cores at HF. If you get the larger beads/tubes
thatwill fit over RG-213 etc. you can make excellent 1:1 current baluns by slipping them over the cable
before putting the connector on. You can hold them in place with "wire-ties". The ferrite is completely
impervious to weather as far as I can tell.

I've also used Fair-Rite cores to construct the input matching transformer in my home-brew 3-500Z amp and
I've used smaller binocular cores to wind matchng transformers for 160 receiving loops.

So, many applications for the cores - not just on Topband!  :-)

Have a good afternoon!

Charlie, K4OTV

-----Original Message-----
From: dospicos <at> q.com [mailto:dospicos <at> q.com] 
Sent: Saturday, May 18, 2013 12:24 PM
To: Charlie Cunningham
Subject: Re: Topband: Thanks!

Hi Charlie:

Thanks for the infos.... and the good wishes.  Im looking at the fair-rite catalog and trying to come up with a
good selection for experimentation when I run into RFI problems.

Not sure how much of a ham market there really is, outside of the lowbanders. I never hear anybody else
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hodgson | 18 May 2013 18:48

Topband: Titanex 160HD

They have also changed the diameters
of the tubes, so any spares that you buy
will not fit the older models.
I just used some aluminium shims plus
a bolt, and as long as you keep it tight
it seems to work ok.
I would also guy it twice.

You could also try contacting Steffen Freitag
DL6SFR as he has helped me in the past with
contacting Titanex.

73 Steve, ZC4Li.

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Dave G4GED | 18 May 2013 16:39
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Topband: Titanex V160HD Sloppy Tube-Joints

Hi All and thanks for reading.

When I luffed-over my 6 year old V160HD for it's annual maintenance 
check, it struck me just how sloppy all the various jointed sections 
have become.
It's not that the securing bolts have become loose, they're still firm 
and tight.

As owners will know, there are two doughnut shaped shims per section 
joint to adjust for the difference in tube sizes and it's the play 
between these and the tube ends that's the problem. I don't remember 
there being between a half to one mm gaps around the circumference in 
the past?

I don't know whether new shims would fix it but Titanex no longer answer 
emails and I wouldn't know where to start trying to find an outsource 
willing to make me a few new ones to the required tolerances.
Adding any more guys than the set I have at 12m is also a no go.
The only thing I think may help, is to try increasing the tube overlap 
at each joint from the present  nominal 5 inch to say 10 inch or more?
Possibly adding an additional bolt at each joint also?

I wonder if any other Titanex owners have had this problem and have any 
advice to share please?

Many thanks in advance.
Dave G4GED
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dospicos | 18 May 2013 15:37

Topband: Thanks!


  

Hi Folks; 

  

Thanks a bunch, to all those who responded with source possibilities for 31 mix toroids !  I will add a
note here, after I actually make a purchase to designate the lucky victim of my small purchase. 

73 Dean  W5PJR 

Tijeras, NM 

  

  
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KB8NTY | 18 May 2013 02:35
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Re: Topband: Topband Digest, Vol 125, Issue 17

Dean,
Kreger Components, Has the best pricing! Better than all distributors, and 
their website displays available inventory on hand.
A 100% woman owned & run company..you dont need to drop any names as they 
all will offer you first class service.
-73-
RossRadio
Antenna Ground Radial Website: http://radialstaple.wordpress.com/

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
www.kregercomponents.com.
----- Original Message ----- 
From: <topband-request <at> contesting.com>
To: <topband <at> contesting.com>
Sent: Friday, May 17, 2013 12:00 PM
Subject: Topband Digest, Vol 125, Issue 17

> Send Topband mailing list submissions to
> topband <at> contesting.com
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.contesting.com/mailman/listinfo/topband
> or, via email, send a message with subject or body 'help' to
> topband-request <at> contesting.com
>
> You can reach the person managing the list at
> topband-owner <at> contesting.com
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Topband digest..."
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dospicos | 17 May 2013 17:06

Topband: RFI ferrites


HI All: 

I am looking for a source(s ) for mix 31 ferrites. Especially in the larger sizes, like the FT 240. I have tried
the usual suspects . Amidon, Digikey, Mouser, Lodestar Pacific, to no avail. 

Any leads will be appreciated, either on or off the list. 

73 to all 

Dean  W5PJR 

Tijeras, NM 
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N7DF | 17 May 2013 15:53
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Favicon

Topband: New Filtering Technique

Is there a possibility that this filtering methodology could be applied to topband systems?
 
http://www.spacewar.com/reports/Making_frequency_hopping_radios_practical_999.html
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Tom W8JI | 17 May 2013 04:19
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Re: Topband: "New beverage"

> Go to http://exax.net/index.html and scroll down the page to "center fed
> steerable wave antenna".  The diagram shows how you can feed a 2-wire
> Beverage in the center, or anywhere along its length.  The two 
> transformers
> in the middle have center taps that pass signal currents from one side of
> the antenna to the other side.  Therefore the entire length of the 
> Beverage
> is active at all times.

Except with coax, you would not connect across the center tap point. There 
would be a direct connection across the shields, since the center has no 
common mode (antenna mode) currents at all.

With a true balanced line, the common mode (antenna mode) connection is 
across a center tap.

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Ron Spencer | 16 May 2013 19:19
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Topband: "New beverage"

After looking at their literature it appears to me that this is nothing 
more then two beverages, one in each direction, with the "feed unit" 
being, perhaps,  a couple relays. I don't see the merit in using RG6 as 
the beverage wire: its heavy, will need more supports, and compared to 
other solutions, perhaps more expensive. And the fact that the feed unit 
can be placed anywhere along the antenna? I must be missing something 
clever because all that would seem to do is make one direction's wire 
longer and the other shorter?

Ron
N4XD
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Mike Greenway | 16 May 2013 00:13

Topband: RG6 BEV

Thanks for all the input, the one thing I did not see staring me in the face was the fact that RG6 is used instead
of wire.  That answers all my questions as I thought there was just a single wire there and could not figure
out how that was possible.  73 Mike K4PI
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Mike Greenway | 15 May 2013 17:21

Topband: NEW BEV DESIGN?

There is new player on the low band receive antenna market that will be at Dayton.  Here is the link  

http://www.pixelsatradio.com/uploads/BevPro-1-Information-for-Web-site1.pdf

I have looked at their brochure but have one big question.  They say the feed point, which has two coaxes, can
be put at any point on the wire.  If I put the feed point at one exteme end, that gives me a bi directional
receive antenna with one wire?  I have used two wire systems and understand the need for the second wire
there, but not sure I see the theory behind two directions from one wire fed on one extreme end.  I have seen
designs that do feed at different points along the line and could see if the feed was put near center you
could get two directions, but it would seem the closer to get the feed to one end, one direction is going to
suffer due to shorter wire length.   I understand they will be at booth BA 0488 on Saturday.  See some of you at
the Topband dinner on Friday night.  7
 3 Mike K4PI

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