[Milsurplus] ART-13 Transmitter and BC-348 Receiver info

[Lloyd Godsey]

Obviously a plot confuse you. There is room for one more on that Hawaiian 
island.
Thanx
Lloyd Godsey  KK7IZ
kk7iz at cox.net
480-620-7145

--------------------------------------------------
From: <arc5 at ix.netcom.com>
Sent: Wednesday, September 08, 2010 2:58 PM
To: <milsurplus at mailman.qth.net>; "Old Tube Radios" 
<boatanchors at theporch.com>
Subject: Re: [Milsurplus] ART-13 Transmitter and BC-348 Receiver info

>
> ----- Original Message ----- 
> From: <k4pf at juno.com>
> Subject: ART-13 Transmitter and BC-348 Receiver info
>
> Tony Vernucci (I0JX) recently worked over an ART-13
> to get it operational, and wrote up his experiences.
> ....
>
> http://www.qsl.net/i0jx/ART-13_BC-348.pdf
>
> --------------------------------
>
> Something I just don't get....
> A lot of people have found that adding a capacitor between the ART-13's
> antenna output and ground lets it tune properly into a 50-ohm antenna.
> But everyone who writes about this quotes a different value-
> radically different.  For instance, in I0JX's article:
>
>    "4.2 Improvement of transmitter efficiency on 40- and 80-meters
>    I have experimentally determined that on 80 meters, and often also
>    on 40 meters, some capacitance must be put in parallel to the antenna.
>     More precisely, in my case:
>   · on 40 meters, an extra parallel capacitance (about 300 pF) is 
> needed...
>   · on 80 meters an extra parallel capacitance (about 2,000 pF) was
>    found to be absolutely necessary, as the RF output power
>    would otherwise be very low......"
>
> I got 120+ watts out on 75 mtrs with the ATC I rebuilt.
> The cap I used was 500 pFd.  That's a long way from 3000.
> And I've heard quotes all up and down.
>
> What gives?
>
> 73 Dave S.
>
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