I see some interesting applications for this type of antenna.
You can have a 80 meter transmitter that will transmit on 80,40,20,15,10 meters
and lots of other frequencies at the same time.
Field strength measurements would be improved by making use of all these
harmonics.
Hi Hi
73
Bill wa4lav
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
TexasRF@aol.com [TexasRF@aol.com]
Sent: Thursday, April 08, 2010 11:31 AM
To: dezrat1242@yahoo.com; amps@contesting.com
Subject: Re: [Amps] CB amp directly coupled via cap to antenna
With the shunt C from tube anode to ground there would not be a case for 50
+j0 right at the tube.
Also, with tube in the discussion the plate load impedance would be a bit
higher than 50 ohms anyway.
Agreed?
Now, your vertical idea has some interesting possibilities: By choosing the
length carefully, one can set the R of the vertical to match the plate
load impedance. You are still left with the need to reconcile the reactance
that remains. Since the tube will be capacitive, perhaps there would be a
happy coincidence of antenna R +j to handle the match, maybe somewhere around
3/4 wave length?. If not, careful selection of the coupling C would surely
make it all possible.
73,
Gerald K5GW
In a message dated 4/8/2010 10:06:13 A.M. Central Daylight Time,
dezrat1242@yahoo.com writes:
ORIGINAL MESSAGE:
On Thu, 8 Apr 2010 08:29:25 EDT, TexasRF@aol.com wrote:
>
>We all know there HAS to be some kind of matching to get significant
power
>transfer.
REPLY:
If the antenna impedance is the same or nearly so as the plate load
impedance, no matching network is necessary. A half wave vertical has
very high impedance and might be just the ticket. Pun intended.
73, Bill W6WRT
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