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Author Topic: R-8  (Read 677 times)
K6AKW
Member

Posts: 2




Ignore
R-8
« on: October 20, 2012, 11:06:18 AM »

Ok, I measured and re-measured during the assembly of my new Cushcraft R-8 but I can't get even a 'close' to usable SWR on any freq.  Is there a history of probable shorting out issues with this antenna.  I just can't believe it's this far off.  Any advise would be really appreciated.
Alan
K6AKW
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W9GB
Member

Posts: 2623




Ignore
« Reply #1 on: October 20, 2012, 11:48:34 AM »

Alan -

The Cushcraft R-8 is the latest version of the 30-year Cushcraft R-series of
Muli-band vertical antennas (R-3, R-4, R-5, R-6000, R-7000, R-7000+, and R-8).
Except for the R-3, ALL of these antennas use a black matching box at the feed point.
The usage and type of traps has varied over the past 30 years.

Cushcraft R-8 Manual
http://www.qsl.net/4/4x6on/RADIO%20MANUALS/CUSHCRAFT/CUSHCRAFT--R8-User-manual.pdf

The Cushcraft R-8 takes considerable time to assemble (2 hours is not uncommon),
the proper assembly of the INSULATORS and aluminum CLAMPS for the
6, 10, 12, and 15 meter stubs is critical (avoid improper shorting, etc.)

Is this antenna BAD (high SWR) on ALL bands??
The CORE R-8 radiator, below the first trap, is a 17/20 meter vertical.  
This is different from earlier R-series designs, which were 10 meter radiators before the traps.

==
IF those are proper, then the MN8 matching box or BT1 / BT2 traps are only other parts to suspect.

w9gb
« Last Edit: October 20, 2012, 12:02:17 PM by W9GB » Logged
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