The best way to find out if your stuff is solid from A-Z is to participate
fully in a RTTY contest. At the end, you will either have working stuff and
be confident it's up to the challenge - or you will have found the next weak
spot!
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: qrv@kd4e.com
Sent: Friday, May 22, 2015 10:20 PM
To: Roger (K8RI)
Cc: amps@contesting.com
Subject: Re: [Amps] SPE 2K RTTY Duty Cycle
There's the point - how many Hams have taken the time and
invested the money to make sure that the entire chain is
up to the task?
As more and more cheap Chinese junk floods the market and
the economy remains in the dumpster (e.g. 4 of 10 adults
able to work in the USA have given up looking for jobs)
Hams - chronically parsimonious - will buy cheap stuff
for their 100w rigs then forget to upgrade when they add
power.
Add to that dirty contacts, worn contacts, loose grounds
or connectors ...
I'll be thoroughly examining every connection in my RF
chain before I power-up the Clipperton-L.
But back to the RTTY question - it does seem that some
versions of MFSK can indeed handle of all of the same
rough conditions listed for RTTY at lower power levels.
I'd still like to see some rigorous side-by-side tests ...
with non-contest ARES/emcomm communications in mind.
YMMV ... :-)
David KD4E
PEP is not the same thing as key-down RTTY by a long shot.
How many switches, feedlines, and antennas, external to the a mp
can survive 1500 w carrier for long?
I'm sorry, but I have to disagree
I think you will find that the Alpha Delta mechanical switches will
more than handle 1.5 KW continuous.
So, yes, there are many components, connectors, feed lines,
switches, and antennas that will handle the legal limit all day long.
*It's where they cut corners the problems arise*
73
Roger (K8RI)
Especially heating at imperfect and/or marginal contacts and
connections?
I'm seeing estimates of 5 seconds, 10 seconds, and 15 seconds of
1500w output in RTTY continuous-duty mode - but unlimited at 1KW.
Most vendors will be cautious about running-at-the-edge as they
know that some Hams will push that margin then blame them when
something breaks.
Question: Is RTTY so inefficient that one really needs 1500w
output?
There are many other keyboard-keyboard digi modes that can hold a
qso under poor conditions at 30-50w.
Just wondering ...
David KD4E
--
*David* KD4E
ARES-EC Bulloch County, Nevils, Georgia USA
Safe & Secure Search Engine: duckduckgo.com
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Restored to design-spec at Heaven's gate 1Cor15:22
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