Pete, broadly in matching theory, a series-capacitor match can often be replaced with a series L and shunt C to ground.
Often the topology will be chosen on component value reasonableness and convenience of what's grounded where. Other times you might have a strong preference for a matching network with hi-pass vs lo-pass characteristics. In the specific case of my 160 transmit antenna, the series-capacitor solution was some ridiculous value. And I found that series L with shunt C had more workable component values with the added advantage that a regular old air variable could be used for the C and tuned to accommodate large QSY's from top to bottom of the 160M band. OTOH if you have vacuum variables laying around you may find that a more convenient solution for you. Tim N3QE On Sun, Sep 1, 2019 at 2:46 PM N4ZR <[email protected]> wrote: > The other day a ham friend suggested using a coil ("hairpin") to match > the low impedance of a well-radialed inverted L to 50-ohm coax. This > struck me as a potentially-attractive alternative to a series vacuum > capacitor, but I don't know enough to evaluate it. Thoughts? > > -- > > 73, Pete N4ZR > Check out the Reverse Beacon Network > at <http://reversebeacon.net>, now > spotting RTTY activity worldwide. > For spots, please use your favorite > "retail" DX cluster. > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
