I didn't add the obvious, FT8 in that manner is a 50% duty cycle but
with enough time to 'catch the breath'.
I remember back when it first came out, Wayne suggested to 'run it with
all the LEDs lit' or something along that line but... it's capable of
MUCH more than 500 watts and wisely better
Good Evening,
Twenty meters was noisy but from what I can tell most of it was from
the storm right over me. Part of the roar I was hearing was the rain
falling on the roof but a lot of it was static. When the rain slowed so
did the static noise. QSB was deep. One second signals were S3
Hi Rick,
That is how mine behaves as well, almost exactly like that... However,
I will be running SSTV, and that is hard on the amp... I need to do a
bit more testing prior to that.
As someone else said upthread, half power is really tough on the amp...
73, and thanks,
Dave (NK7Z)
I use my KPA 500 in SSB and CW ops. Much of it as net control on traffic nets
and passing traffic. A little pile up breaking during DXing and some hunt and
pounce contesting.Temps usually hover around 50c with some trips to mid to
upper 50s.I don't remember seeing it hit 60c.In almost four
I think reaching fan speed Level 5 requires clearance for take off :)
FWIW, Wayne answered my CQ on 40 CW today with his K4. Of course, it sounded
terrific. I want one!! I wonder if I can convince the XYL to contribute her
economic stimulus check to the cause? Hmmm...
John K7FD
> On May 3,
I spent 15 minutes active on 20M FT8 this afternoon (some lurking).
At 530 watts output (on the display and utility) into a 1.13:1 antenna
load (SteppIR) for a ten minute calling period (Mongolia then Oman), the
temp rose to 66C; a few moments of elevated fan quickly brought that
down to the
"It is interesting to hear how others experience their KPA500s over various
conditions."
I have over a years's worth of KPA500 data recorded but it takes some effort to
run it through the Excel templates to make pretty plots.
My KPA500 temperatures are strongly influenced by ambient
SWL report: I was in Peterborough, NH sitting outside with my
KX3 on a picnic table near the Contoocook river. i.e. in a
valley) using an AX1 and AX1E and running 5W on the internal
batteries. No one could hear me, but reception was reasonably good.
NC0JW was up around S5 (with a noise level
Hello Patrick,
In the past, Chinese wages were really low so that the total costs of wages +
hidden costs were still commercial viable. Now, the story is totally different
and you have to be worried about quality control and intellectual rights issues.
I am in Hong Kong and have seen the
Let me state things a bit better this time. The amplifier is designed to
protect itself, and does a very good job of it no matter the condition.
It will do a good job of warning you before anything bad happens; make sure bad
things don’t happen very much and your amp will have a very happy life.
Welcome back to HF! If you reach me off the list I am happy to arrange a
sked when you are ready. Might be tough QRP to QRP but always worth a
try. I think you will be very pleased with the KX2, mine has mostly made
digital contacts up until this point but I have been very pleased with it.
Hope
As a ship's chief engineer I ran to Asia from the west coast for many years
(30+). In the 60's it was true that the Chinese people made very poor wages but
not so any more. It was also true that many of the products were marginal. In
the years before I retired, my company shipyarded their
Glad to see this post, could almost be from me in a week or so. The only
difference is I’ve been AWAY from HF for 19 years and CW since the early 60’s.
Been reading the KX2 manual over and over and think it has to be at least as
good as you say for this guy, could be more.
>
Normally high 50's to low 60's in a rag chew. During a CW contest running
stations, it sits around 65C more or less.
On Sun, May 3, 2020 at 5:53 PM Dave Cole wrote:
> I hope others chime in with the operating temps they routinely see...
> This is a very useful discussion.
>
> 73, and thanks,
>
7.280 mHz 1800Z
WM6P Steve GA K3snet control
KB9AVO Paul INK3s
N8SBE DaveMIK3s
WB9JNZ Eric IL K3
KA3RGM Joe PA TS440S
NC0JWJim
I hope others chime in with the operating temps they routinely see...
This is a very useful discussion.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 5/3/20 3:47 PM, Ted Edwards W3TB
I am glad to see these numbers and comments, because I have wondered about
the temperatures. If running on CW in contests, it shows upper 50s and
reaches 60C.
Thanks gang!
On Sun, May 3, 2020 at 17:42 Dave Cole wrote:
> Pure paranoia! :)
>
> I tend to creep into things I consider limits, and
Pure paranoia! :)
I tend to creep into things I consider limits, and not race to them. I
normally run the amp in such a way that it never exceeds 60 or at worst
65 C. Seeing it hit 70 makes me nervous...
So...
Prior to any excursions in to the above 70C area I need to learn more,
which
Thanks! I found the earlier manual online, and am back operational!
Thanks!
Tom W4KX
> On May 3, 2020, at 4:14 PM, iain macdonnell - N6ML wrote:
>
> On my early model, the interlock switch is actuated by an assembly
> including a 13mm 4-40 standoff (and some other hardware), which is
>
Dave;
The KPA500 will protect itself above 90C, but it will work quite well at 70C.
Why do you stop at 70C?
73!
Jack, W6FB
> On May 3, 2020, at 1:26 PM, Dave Cole wrote:
>
> Hello,
>
> I just got the new MMSSTV software, and will be running a bit of SSTV. SSTV
> is 100% duty cycle.
>
>
Hello,
I just got the new MMSSTV software, and will be running a bit of SSTV.
SSTV is 100% duty cycle.
Initial testing here indicates no power level is safe... At 150 watts
the KPA500 reaches 70C pretty fast, in under two minutes, and 70C is my
upper limit for testing... At 500 watts it
Ian,
Could you also send me a copy, I have an older amp as well.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 5/3/20 1:14 PM, iain macdonnell - N6ML wrote:
On my early model, the
On my early model, the interlock switch is actuated by an assembly
including a 13mm 4-40 standoff (and some other hardware), which is
attached to the inside of the top cover. I'll attempt to send you the
old (rev C) assembly manual off-list.
73,
~iain / N6ML
On Sun, May 3, 2020 at 1:07 PM
Problem is definitely the interlock switch not being engaged correctly: if I
close it manually (with a wooden rod!) the amp operates normally.
Anyone have an assembly manual for the older type KPA500, so I can see how the
top-panel interlock switch is supposed to be engaged? Again, this a
One of the big post-Covid changes will be a big drawing back on
freewheeling and vulnerable global supply chains— I am all for that when I
take my blood pressure pill every morning.
On Sun, May 3, 2020 at 14:26 Raymond Sills via Elecraft <
elecraft@mailman.qth.net> wrote:
> Hi Group:
> If
Hi Group:
If nothing else, the COVID-19 virus demonstrates that we live in a global
civilization. And, the Chinese manufacturers will build to whatever quality
level you specify. You can have cheap stuff or high quality products or
components.A lot of today's smart phones (like the iPhone)
Hi Jack!
After cycling the main power the HV in standby is back to 70 V. But, every time
I go to operate mode, the error reoccurs.
This is with what I believe was the old style interlock switch (has a shaft
attached to the top cover to engage the switch when the top is screwed down).
Can’t
Depends on the parts. The largest parts you see are indeed made in the US -
these being the sheet metal, push buttons and many other components.
Global economy? Yes. Is the entire box made from components coming from outside
the US? Definitely not. And I am 100% sure that the radios and devices
Josh Fiden wrote
> Wages not that low in China anymore.
>
> 73
> Josh W6XU
>
> Sent from my mobile device
>
>> On May 3, 2020, at 11:24 AM, Nr4c
> nr4c@
> wrote:
>>
>> You do realize that for every k-Line component you buy, you are pay a
>> Chinese worker a few dollars a eeek to
A “270V ERR” fault indicates that the TR switch bias supply is not working.
This may be caused by the top cover being removed, the safety switch attached
to the top cover becoming loose or an actual failure of the 270V supply. Since
your main HV supply is now down close to 0V, it looks like you
Wages not that low in China anymore.
73
Josh W6XU
Sent from my mobile device
> On May 3, 2020, at 11:24 AM, Nr4c wrote:
>
> You do realize that for every k-Line component you buy, you are pay a
> Chinese worker a few dollars a eeek to manufacture the ic’s, transistors,
> resistors,
My KPA500 has been working fine waited for 115 V. Just now it has been throwing
a “25=70 VAC” fault!
Can anyone lead me in helping this? Fuses look good. HV read 0.1 v when in
standby, which is FAR from the 70 some volts it used to read.
Thanks!
Tom W4KX
You do realize that for every k-Line component you buy, you are pay a Chinese
worker a few dollars a eeek to manufacture the ic’s, transistors, resistors,
capacitors, and other parts that get assembled in good ol’ USA.
Sent from my iPhone
...nr4c. bill
> On May 3, 2020, at 9:14 AM, Larry
If there's one thing this "pandemic" has taught me.Buy American!
So glad I invested in the K-Line several years ago.
Larry, KN8N
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