Re: [IRCA] Recent logs from Moody, Texas

["Chuck Hutton" <charlesh3@xxxxxxx>]

James:

The -43 core is recommended down to 1 MHZ and declines in performance just a
little down to .5 MHZ so you should not have a fatal problem with the 43.

What you do need is a more turns of wire. You need a minimum of 10 turns on
the rx side and 30 on the antenna side for a -43 core at .5 MHZ. That's a
fair bit of wire to wind. Because of that, and because the losses are a
little lower, people use 73 or 77 cores for medium frequency work where you
need. For a simple, guaranteed-to-work transformer, take a look at
http://www.w8ji.com/core_selection.htm then scroll down to the Beverage
matching transformer. You'll need to change the number of turns on the
antenna side so that there are about 8 turns.

With your 6 turn winding, you have about a 66 Ohm winding across your
receiver input so basically half the signal is getting lost at .5 MHz. Does
that match up with what you mean when you say it is "dead"?


Chuck

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]
On Behalf Of James Niven
Sent: Monday, January 08, 2007 6:03 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] Recent logs from Moody, Texas

Hi Craig,
On each antenna there is a 9:1 matching transformer with 6 turns on the
receiver side and 18 turns on the antenna side. The terminating resister is
680ohms. The toriod is FT-114-43 purchased from Amidon. Each antenna is feed
with 4 separate RG6 runs to a 4 position rotary switch.

Thanks
 
James Niven



----- Original Message ----
From: C B <bevdxer@xxxxxxxxx>
To: Mailing list for the International Radio Club of America
<irca@xxxxxxxxxxxxxxxx>
Sent: Monday, January 8, 2007 7:48:29 PM
Subject: Re: [IRCA] Recent logs from Moody, Texas


Hi James,

Did you equip your EWE with an impedance matching
transformer and a terminating resistor?

Craig Barnes
Wondervu, CO

--- James Niven <niven43@xxxxxxxxx> wrote:

> Hi All,
> 
> After working on my EWE antenna 10x50x10 in the
> spade of a + sign, this is 4 antennas. It works very
> well on frequencies above 1350khz and very
> directional. 
> Before the EWE was commissioned, I was using a 300
> foot longwire pointing south.
> 
> On 1570khz XERF justs booms in with a monster
> signal. Now with the EWE, I am able to knock down
> XERF and I logged KSXT in Loveland CO last night.
> Tonight I heard a country station with a slogan as
> "Country Legends 15-70". It just disappeared like
> changing to night pattern. Anyone know who this may
> be?
> 
> On 1600khz I logged KRKE in Albuerque, NM before
> changing to night pattern with rockin Oldies, nice
> signal.
> 
> I am not sure why the EWE is not working on the
> lower part of the band, it appears to be dead.
> Anyone offer some suggestions?
> 
> Thanks
>  
> James Niven,
> Moody, Texas
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam
> protection around 
> http://mail.yahoo.com 
> _______________________________________________
> IRCA mailing list
> IRCA@xxxxxxxxxxxxxxxx
> http://montreal.kotalampi.com/mailman/listinfo/irca
> 
> Opinions expressed in messages on this mailing list
> are those of the original contributors and do not
> necessarily reflect the opinion of the IRCA, its
> editors, publishing staff, or officers
> 
> For more information: http://www.ircaonline.org
> 
> To Post a message: irca@xxxxxxxxxxxxxxxx
> 
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the
original contributors and do not necessarily reflect the opinion of the
IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the
original contributors and do not necessarily reflect the opinion of the
IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx


_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx