Topband: How Good is Good Enough?

[ZR]

Its very easy to match when using the BN73-202 if you use half turn steps 
when needed and use an antenna bridge to confirm since ferrite Al values 
have a wide tolerance.

And with a low impedance line such as WD-1A there IS a difference in antenna 
mode and transmission line mode values. Plus you have to use the correct 
impedance value for the CT transformers.

Carl
KM1H


----- Original Message ----- 
From: "Andrey Fedorishchev" <ra6lbs at gmail.com>
To: "ZR" <zr at jeremy.mv.com>
Cc: "Topband" <topband at contesting.com>; "N1BUG" <paul at n1bug.com>
Sent: Monday, March 12, 2012 12:55 PM
Subject: Re: Topband: How Good is Good Enough?


> the KEY WORD is: "... when properly terminated at both ends  ..."
>
> not so easy with FireRite 73 binoculars
>
> and the line impedance IS different from different manufacturer ...
>
>
>
>
> 2012/3/12 ZR <zr at jeremy.mv.com>
>
>> I dont find WD-1A or WF-16/U to be lossy at all when properly terminated 
>> at
>> both ends. Thats what is used here for the 5 reversibles and a reversible
>> BOG will be tried soon.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message -----
>> From: "N1BUG" <paul at n1bug.com>
>> To: "Topband" <topband at contesting.com>
>> Sent: Monday, March 12, 2012 11:22 AM
>> Subject: Re: Topband: How Good is Good Enough?
>>
>>
>> >> If you need a preamp on any Beverage you have a problem IMO. Its too
>> >> long,
>> >> poorly terminated or there is a lot of feedline loss.
>> >
>> > Or you've been forced into some other bad situation.
>> >
>> > I have a local noise problem that is beyond my control.
>> > Unfortunately I can't afford the DXE noise canceller so I got an
>> > MFJ. With my ~600 foot Beverages as main antenna and a very short
>> > vertical as the aux antenna it will completely null the noise (on
>> > most Beverages). Unfortunately with its high noise floor I lose
>> > several dB S/N unless I use a preamp ahead of it.
>> >
>> > My Beverages have lower signal output than most in some directions,
>> > since they are reversible using WD-1A wire (lossy as a transmission
>> > line).
>> >
>> > Not everyone can construct an ideal station, but even with all these
>> > problems it is far better than not having Beverages at all.
>> >
>> > The bottom line is using a preamp buys me several dB S/N I cannot
>> > get any other way (only when using the noise canceller).
>> >
>> > Paul
>> > _______________________________________________
>> > UR RST IS ... ... ..9 QSB QSB - hw? BK
>> >
>> >
>> > -----
>> > No virus found in this message.
>> > Checked by AVG - www.avg.com
>> > Version: 10.0.1424 / Virus Database: 2113/4866 - Release Date: 03/12/12
>> >
>>
>> _______________________________________________
>> UR RST IS ... ... ..9 QSB QSB - hw? BK
>>
>
>
>
> -- 
> Andrey Fedorishchev,
> RA6LBS
>
>
> www.RA6LBS.ru
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2113/4866 - Release Date: 03/12/12
>