Just received a KPA 500 and KAT 500 yesterday. Using them with my Icom
7300. I know the manual says to expect some hum from the KPA 500 but I
believe mine is more than a hum. When I send CW I don't need to monitor
the radio side tone. I just have to listen to the amp. :-) Anyone else
experienc
Last week i assembled the kpa500 of oe6rdd
when we transmit we hear a realy loud hum (50hz) in the rythm of the cw signals
i have compared this with my own kpa-500 and there is no hum
i have tried to loosen the big srew which holds the tranformer with no result
any ideas ??
73
Klaus
OE6KYG
KX1
Hello OM,
For those who suffer from 'hum' (I solved my problem already), please
contact supp...@elecraft.com
Gary and his colleague will always be glad to help.
TNX & 73,
Johnny VR2XMC
從︰ Leigh L. Klotz Jr WA5ZNU
收件人︰ elecraft@mailman.qth.net
傳送日期︰ 2011年
You may not have the transformer properly tightened down. Recheck it.
Also, 58V is not that bad, but you might want to recheck that you are using the
proper tap
from the transformer. You just might want to go up a notch to get a higher
voltage. Essentially
you want the tap that provides the high
Klaus,
Are you sure it is the KPA500?
My computer speakers in the shack will hum when using any of my HF amplifiers on
CW.
73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member
On Mon, 1 Aug 2011 07:33:05 +, Klaus Koppendorfer wrote:
>
>Last week i assembled the
The same hum here since I changed to the *RED TAP (211 to 230V).*
I had _no hum with the YELLOW TAP (231 to 250 V)_. But then I had less
than 60V with full power.
The hum is coming out of the KPA500.
What to do?
Lothar, DJ8EW
K3 1300 + KPA500 229
Am 01.08.2011 09:33, schrieb Klaus Koppendorfer:
>
We're looking into this.
73,
Wayne
N6KR
On Aug 1, 2011, at 3:11 PM, Lothar Sack wrote:
> The same hum here since I changed to the *RED TAP (211 to 230V).*
> I had _no hum with the YELLOW TAP (231 to 250 V)_. But then I had less
> than 60V with full power.
> The hum is coming out of the KPA500.
>
I too have noticed a hum emanating from the KPA500 (#26), but the
circumstances are a bit strange. The hum comes sometimes when the KPA500 is
off. By that I mean it is powered down (front panel power switch is off..no
leds are lit), but not removed from the AC outlet. If I flip the rocker
switch on
Hi
I took part in IOTA contest at the weekend in the unassisted category, CW, high
power.
The KPA-500 was used for the first full 24hrs contest here with M3i call-sign
and I did give it a darn good work-out end result performance was just fab.
No hang-ups, instant power, band change, big pile-ups
When the back panel switch is on, the low voltage power supply for the
front panel is still on, allowing the microprocessor to read the front
panel 'power' switch and talk over RS-232. A low level of power supply
hum from this small transformer is totally normal in this case. Of
course, turnig
fter their investigation.
Frank - W6NEK
- Original Message -
From: "ai6ii"
To:
Sent: Monday, August 01, 2011 10:13 PM
Subject: Re: [Elecraft] KPA 500 Hum
>I too have noticed a hum emanating from the KPA500 (#26), but the
> circumstances are a bit strange. The hum comes somet
e amp. ;-)
Frank - W6NEK
- Original Message -
From: "W6NEK"
To:
Sent: Wednesday, August 03, 2011 8:59 AM
Subject: Re: [Elecraft] KPA 500 Hum
>I confirm the exact same hum issue as Mike describes below.
> (Front panel power switch is off and there is an intermittent acous
One clarification to my last post.
It is important that users power off the KPA500 using the front panel
power switch before killing power with the rear panel switch.
If you only use the rear panel power switch for main power then any
changed parameters (including last band) will not be saved a
Hi Eric
Thanks for the email.
It's not a problem. really. In fact
I'm now seriously thinking of buying a 2nd kpa500 amp for SO2R!
Cheers
Ken..G0ORH
Sent from my iPhone
On 3 Aug 2011, at 16:55, "Eric Swartz - WA6HHQ, Elecraft"
wrote:
> When the back panel switch is on, the low
In a recent message, Ken Chandler writes
>
>I'm now seriously thinking of buying a 2nd kpa500 amp for SO2R!
>
>Cheers
>
>Ken..G0ORH
>
>Sent from my iPhone
Alternatively, Ken, you could operate your second KPA500 in parallel to
run the full 1kW ;-)
73 de David G4DMP
Sent from my Netbook
SO2R means single operator two receivers. Where does a second linear
come into this?
73 Dave G3YMC
On 4 Aug 2011 at 7:46, David Pratt wrote:
> >
> >I'm now seriously thinking of buying a 2nd kpa500 amp for SO2R!
> >
> >Cheers
> >
> >Ken..G0ORH
>
> Alternatively, Ken, you could operate your sec
Dangme thunked it meant Single Operator Two Radios...my bad!
:-)
Gary
On 4 August 2011 17:15, Dave Sergeant wrote:
> SO2R means single operator two receivers. Where does a second linear
> come into this?
>
> 73 Dave G3YMC
>
> On 4 Aug 2011 at 7:46, David Pratt wrote:
>
> > >
> > >I'm now s
Correct - a 'Radio' is really a receiver. Perhaps he meant SO2T -
'Single Operator, Two Transceivers'
The use of the word 'Radio' to mean 'Transceiver' migrated from the
world of CB :-( In amateur radio we always used to refer to our
equipment as a rig or a transceiver. But the CB world has a
Excuse me..
Ken..G0ORH
Sent from my iPhone
On 4 Aug 2011, at 09:46, David Pratt wrote:
> Correct - a 'Radio' is really a receiver. Perhaps he meant SO2T -
> 'Single Operator, Two Transceivers'
>
> The use of the word 'Radio' to mean 'Transceiver' migrated from the
> w
an.qth.net
Subject: Re: [Elecraft] KPA 500 Hum
Klaus,
Are you sure it is the KPA500?
My computer speakers in the shack will hum when using any of my HF
amplifiers on CW.
73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member
On Mon, 1 Aug 2011 07:33:05 +, Klaus Ko
The hum is due to magnetic field in close proximity of the speaker...usually.
Sometimes RF gets into them usually on the power cord. Ferrite fixes this,
moving the speakers fixes the former.
Chuck, KE9UW
--
View this message in context:
http://elecraft.365791.n2.nabble.com/Re-KPA-500-Hum-PC-Speak
RFI problems with the computer speakers are generally due to the
absence of the bypass components recommended by the amplifier chip
designers. I have seen several inexpensive computer speakers with
holes for the bypass caps on the circuit board (the chip maker's
reference design) but no parts. G
discussion is drifting away to amplified speakers but there is realy a problem
with
HUM comming from KPA500
1) HUM during transmit
2) HUM somes sometimes when the KPA500 is off, but on line and backswitch on
__
Elecraft mailing list
Ho
I have experienced absolutely no hum, either mechanical or electrical,
associated with my KPA500 in either of my two ham shacks.
/Rick N6XI
On Tue, Aug 2, 2011 at 11:08 PM, Klaus Koppendorfer wrote:
> discussion is drifting away to amplified speakers but there is realy a
> problem with
> HUM co
Klaus,
I know you've already contacted Elecraft Support about this. Right?
If you have not, you will have a good deal more success contacting them, since
they have probably already seen this before and know what to look for.
73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetim
Bob, our KPA500 engineering project manager, will be contacting Klaus.
73, Eric WA6HHQ
---
www.elecraft.com
On 8/3/2011 1:37 PM, n...@n5ge.com wrote:
> Klaus,
>
> I know you've already contacted Elecraft Support about this. Right?
>
> If you have not, you will have a good deal more success co
On 8/3/2011 9:40 AM, Rick Tavan N6XI wrote:
> I have experienced absolutely no hum, either mechanical or electrical,
> associated with my KPA500 in either of my two ham shacks.
>
> /Rick N6XI
Nor have I in my one ham shack. In fact, the only time I've heard the
fans come on is when I shut the am
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: htt
The hum seems to be the 50 Hertz power supplies?
--
View this message in context:
http://elecraft.365791.n2.nabble.com/KPA-500-HUM-from-PA-and-not-from-Speaker-tp6647675p6652787.html
Sent from the Elecraft mailing list archive at Nabble.com.
___
29 matches
Mail list logo
