Mike: Rhombics can be operated either terminated or unterminated. If
unterminated, they are bi-directional with half the power in each lobe.
If terminated, the resistor absorbs half the power in the reverse lobe.
Either way, half your power goes the "wrong" way, either behind your
desired direction or heats a big resistor. They have a very low
radiation angle and a fairly narrow beamwidth which is why they're flame
throwers and very common in military and commercial stations,
particularly in the days of point-to-point radio circuits. V-beams,
sometimes called Half-Rhombics are sort of likewise only broader azimuth
patterns more suitable for maritime ship-shore telegraphy circuits. For
ham applications, Google W6AM
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 9/13/2019 3:24 PM, Mike Markowski wrote:
Can you expand on this, Ken, or if easier, a reference? I'm curious
what tradeoffs are made. I used a rhombic at Ft. Monmouth, NJ before
the Army base was closed in 2011, and used to boom into Europe and
Russia. It was amazing. I also got copies of WWII manuals on rhombic
construction while there. You know, just in case I became wealthy
with tens of acres of land. :-)
73,
Mike ab3ap
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