Guys,
On the other hand, there nothing wrong with trying to characterize the
beastie you have as best you can. If for no other reason to see if
something changes with time and how much.
Also, how does my kit comparing to other kits which presumable have
similar but not identical
Guys,
I'm also curious about this-- especially what's going on on 15M.
My values at 500 W out into a dummy load are:
(amp), [volts], {efficiency}
1.8MHz DC (11.5) [63.1] {70}
3.5MHz (11.2) [63.5] {71}
7MHz(12.2) [62.5] {67}
10.1MHz (not measured)
14MHz (13.4)[61.8]
When the KPA100 (the K2's 100w amplifier stage) came out, some of us noted
similar issues.
The gain available from a transistor varies in the opposite direction to
frequency, and
the circuits include feedback mechanisms to try to balance it. The
characteristics of real
components have some
Is your dummy load absolutely a flat 1.0:1 from 1.0MHz to 30MHz?
73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member
Only the white eyes would believe they could cut the top
off a blanket, sew it to the bottom and have a longer
blanket.
-- American Indian comment
Hmmm,
Given that ham-affordable components are full of minor and harmless
frequency dependent characteristics, INCLUDING the antennas and dummy loads
used, is there really any good reason to EXPECT 1.8-30 power output
uniformity beyond what is commonly measured? Quite contrary to amps which
were
On Tue, Feb 7, 2012 at 3:23 PM, n...@n5ge.com wrote:
Is your dummy load absolutely a flat 1.0:1 from 1.0MHz to 30MHz?
Suppose that the SWR is 1.2. This means that 0.8% of the power is
reflected (80 milliwatts reflected for 10 forward). If the SWR is 1.1,
the reflected power is
Guy and all,
You are so correct. This is ham radio, and precision instrumentation
for power output levels is not the norm - a 20% error potential should
always be considered.
Yes, I personally have power instrumentation that is calibrated to the 5
% level up to 30 MHz. That level of
Tony,
All you say is true. and should be heeded by all hams.
I have dummy loads that are known to be flat (within 5%) to 1 GHz, and I
have several more that are flat to within 500 MHz. Others will display
the same characteristics to 60 MHz. I know which ones are which, and I
rely on them to
I have recently assembled KPA500 serial number 641. When testing into a dummy
load I find that I get a large variation in the DC power input when driving for
500W CW when I go from band to band. My worst band is 21MHz, where I get the
highest current (lowest efficiency). The drive was
120 or 240 volts supply?
On Feb 4, 2012, at 2:27 PM, david park contrast...@yahoo.com wrote:
I have recently assembled KPA500 serial number 641. When testing into a
dummy load I find that I get a large variation in the DC power input when
driving for 500W CW when I go from band to band. My
Given that the poster is in the UK can probably assume 240Vac.
Regards,
Mike VP8NO
On 04/02/2012 17:31, Jack Berry wrote:
120 or 240 volts supply?
On Feb 4, 2012, at 2:27 PM, david parkcontrast...@yahoo.com wrote:
I have recently assembled KPA500 serial number 641. When testing into a
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