"The best I could reach now on 160m is
- SWR: 1:1.29 (Rs=40.4 Ohms, Xs=-5.4 Ohms)
vs. in 2019:
- SWR: 1:1.16 (Rs=43.2 Ohms, Xs=-1.6 Ohms)"
If I can get those matches on a *transmitting* antenna, I am very satisfied!
I built three 2-wire beverages using W0BTU's design (single coax) and
Sorry Guys, I miss interpreted Csaba’s transformer problem. My email program
truncated the URL’s and most of the information past that point. What I did get
I misread as a result so now I am curious also of his dilemma.
Lee K7TJR OR
From: Don Kirk
Sent: Saturday, January 2, 2021 3:03 PM
To:
Hi Don,
Regardless of the transformer whether it’s a tapped or separate. I gave him
the tools that should make whatever he does correct. Personally I keep my
Beverage when I make one at 450 ohms which makes the matching much easier for
me. I just put up my first one yesterday in several
Hi Lee,
Csaba also refers to this transformer as T2 and based on what he has said
so far I suspect he is constructing something similar to the two direction
beverage shown in figure 7-115 in the 5th edition of Low-Band DXing. And
T2 is indeed a two winding transformer with center tap. This
Hi Lee,
Csaba said his transformer was " n1=3T/n2=12T tapped @6T ". This sure
sounds like a transformer with two separate windings (3 Turns on the
Primary, and 12 Turns on the Secondary and then it also has a center tap on
the secondary), but I could be wrong. I think Csaba needs to clarify
Ah! Very helpful, thanks!
73 Mike
W0BTU
On Sat, Jan 2, 2021, 2:21 PM Lee STRAHAN wrote:
> Hi Mike,
>
>Assuming that you did not miss that this was a tapped winding and not
> separate windings as Csaba mentioned. I see on reflection that he measured
> 1:1.16 on one of his tests. In reality
Hi Mike,
Assuming that you did not miss that this was a tapped winding and not
separate windings as Csaba mentioned. I see on reflection that he measured
1:1.16 on one of his tests. In reality it wont likely get much better than
that. That test was likely the 3:12 he mentioned using. The
Lee,
What kind of wire do you use that allows that many turns (4t and 16t)?
73 Mike
W0BTU
On Sat, Jan 2, 2021, 1:37 PM Lee STRAHAN wrote:
> Hello Csaba,
>I approach this problem this way your impedance ratio is 745/50 ohms or
> 14.9 . To get turns ratio use the square root of that which
Hello Csaba,
I approach this problem this way your impedance ratio is 745/50 ohms or 14.9
. To get turns ratio use the square root of that which is 3.86 . So round that
up to 4 as a good turns ratio.
On a BN73-202 core I usually use a minimum of 4 turns on the 50 ohm side for
160 meters,
Hi All and HNY for 2021.
Preparing for the CQ160m with new (2 coax) 2-wire beverages to
cover the missing azimuthal gaps based on LBDX. The first 2x
Bevs worked great back in last Jan.
Now I have difficulties with reaching good imped match with the
T2 transformer (responsible to transform the
Nice to work some friends on SSB last night . . .
Hope we'll have even more on next Friday !
73 Roger G3YRO
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