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Old December 31st 08, 09:59 PM posted to rec.radio.shortwave
RHF RHF is offline
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First recorded activity by RadioBanter: Jun 2006
Posts: 8,652
Default MatchBoxes Do They Work ? -aka- Improve Your Effective RadiatedPower ?

On Dec 31, 1:34*pm, John Smith wrote:
RHF wrote:
On Dec 29, 1:44 pm, John Smith wrote:
RHF wrote:


[...]


- Anyway you cut it ... a matchbox never will improve
- the performance of a poor antenna,


JS,


- - So you are saying that I have an Antenna and Transceiver
- - and can hear 5 Radio Operators in a Net on a Frequency;
- - but only 2 of them can hear me.

= BAD {Lousy} Poorly "Radiating" Antenna
without the 'matchbox' in the circuit.

- - I then put a MatchBox in-line between my Antenna and
- - Transceiver and Adjust-It; and can still hear all 5 Radio
- - Operators on a Frequency and now all 5 of them can
- - hear me.

= GOOD {Better} Nicely "Radiating" Antenna
with the 'MatchBox' in the circuit.

Once Again 'why' is it that with the MatchBox and the
same Antenna and Transceiver : Now more people can
hear me or hear me better : It the same Poor Antenna

Hey may be MatchBoxs are Super Radiators ? and they
are now hearing me off my MatchBox versus my Poor
Antenna without the 'matchbox'.

- - AGAIN - -
- - To Me That Is Very Real Improved Performance from
- - My Antenna and Transceiver that is a direct result of
- - using the MatchBox between them. ~ RHF
- - *.

increase the capture area of a poor antenna, etc.


It will MASK that antennas' short-comings ... same as sweeping dirt
under a rug (notice, another mechanical analogy to the above.)


Regards,
JS


I guess, any possibly way it can be explained to you, will fail ...

If you introduce an inductance to resonate the antenna, you introduce a
loss, if you introduce a capacitance, the same ... LC or PI networks,
commonly used in matchboxes, have notable losses.

I have a 60ft longwire, mounted ~40 ft. in the air. *Since it is only
physically resonate on but a couple/few freqs, and, since I am not
employing some form of matching on the antenna, and since the antenna
does not, naturally, present a correct impedance to my feedline/rig,
some form of lossy matching must be tolerated ... since the matchbox is
located at my receiver, whatever feedlines I choose will also become a
part of the "antenna." *The ideal placement for a matchbox would be at
the antenna, as everyone is and has been aware of for a long time, or
should have been aware.

As I stated, continue to state, and have no other choice than to state
when worried about being correct--no matchbox will ever improve the
performance of a poor antenna--all it can do is allow you to get maximum
benefit of that poor performance.

You have separate components, affects/effects, terms, etc. all confused
and lumped together. *Antenna design, capture area, etc. effect antenna
efficiency--the impedance that/those designs/constructions entail, and
the method of matching (transforming) that impedance to one acceptable,
is another "thing", all-together.

Regards,
JS