[CQ-Contest] Dunestar mod. 600 insertion rf loss

[tgstewart at pepco.com]

22, 2000) at
  02/22/2001 11:00:18 AM
MIME-Version: 1.0
Content-type: text/plain; charset=us-ascii
Sender: owner-cq-contest at contesting.com 
Precedence: bulk
X-List-Info: http://www.contesting.com/FAQ/cq-contest
X-Sponsor: W4AN, KM3T, N5KO & AD1C



One thing that can happen with the Dunestars is that the disc caps they use
on the upper bands can get damaged easily and then insertion loss goes up.
Usually you'll notice an increased SWR as well.

One thing you need to make sure of is that you dont use the radio's
built-in antenna tuner when using one of these filters.  If you do and
there is a mismatch on the output of the filter, it'll create huge voltages
across the filter components and burn them up.  A lot of times it'll just
damage them and degrade performance rather than completely fail.

73, Ty K3MM




                     Dave 
Hachadorian
                     <k6ll at juno.com>              To: 
cq-contest at contesting.com
                     Sent 
by:                     cc:
                     owner-cq-contest at cont        Subject:     Re: 
[CQ-Contest] Dunestar mod. 600
                     esting.com                   insertion rf 
loss


                     02/20/2001 09:23 
PM







I have two Dunestar 600's, and they both show about 80
watts out with 100 watts in. The amplifier draws noticeably
less plate current with the filters in line. I know it's less
than -1 dB, but every little loss hurts, especially
psychologically.

Dave Hachadorian, K6LL
Yuma, AZ
K6LL at juno.com



On Tue, 20 Feb 2001 18:48:29 -0000 "Gian Luca Cazzola" <glcazzola at iol.it>
writes:
  >
  >
  >
  >   I have found that connecting my new Dunestar model 600 to my
  > FT1000MP or to
  >   my Cubic Astro 102-BXA,  on an Heathkit Cantenna Dummy load, there
  > are rf
  >   loss that seem to me  too high.
  >   Examples (measurements with Bird 43 unit 250w or Drake MN2700
  > wattmeter the
  >   same):
  >   28.025 or 28.500, in 100w out less than 85 watt
  >   14.025 or 14.200, in 100w out 90w.
  >   I ask to other Dunestar 600 owners if their units has the same rf
  > loss.
  >   Thanks es 73
  >   Ian Ik4EWX
  >
  >   glcazzola at iol.it
  >
  >  >
  >
  >
  > --
  > CQ-Contest on WWW:        http://lists.contesting.com/_cq-contest/
  > Administrative requests:  cq-contest-REQUEST at contesting.com
  >


--
CQ-Contest on WWW:        http://lists.contesting.com/_cq-contest/
Administrative requests:  cq-contest-REQUEST at contesting.com


--
CQ-Contest on WWW:        http://lists.contesting.com/_cq-contest/
Administrative requests:  cq-contest-REQUEST at contesting.com