Re: [Elecraft] KPA500 troubles

Probably best to change the topic of this, as it has drifted into a different area. Eric /elecraft.com/ On 11/13/2015 9:01 PM, Jim Brown wrote: On Fri,11/13/2015 1:30 PM, Wes (N7WS) wrote: Note, there is no mention of any directivity, or lack thereof, so I would take it that this is a

Re: [Elecraft] KPA500 troubles

Why would one filter, that like just like all of the others is switched into the circuit by a relay on each end, fail while none of the others do not? On 11/11/2015 1:32 PM, Jim Brown wrote: The LPF is on the output of the amplifier. One possible cause of failure could be lightning.

Re: [Elecraft] KPA500 troubles

Then I guess I could just "vaguely" follow the rules, sort of like the President, his cabinet, the heads of the alphabet soup agencies, IRS, EPA, FBI, NSA, VA, ICE, DHS,... do. That said, I think you're making this too complicated. The rule states: "For the purpose of computing ERP, the

Re: [Elecraft] KPA500 troubles

On Fri,11/13/2015 1:30 PM, Wes (N7WS) wrote: Note, there is no mention of any directivity, or lack thereof, so I would take it that this is a theoretical free-space value. One could do that, of course, but your original post brought ground conductivity into the computation, which is, IMO,

Re: [Elecraft] KPA500 troubles

Eric Swartz was very clear about this in a message to this group yesterday: "Component failure like this can occur in any manufacturer's radio or amplifier for many reasons, such as power line surges, nearby lightning strikes, operating with excessive SWR, transmitting into a wrong antenna etc.

Re: [Elecraft] KPA500 troubles

But why would a filter for a band that the operator had never used fail? Vic 4X6GP/K2VCO > On 13 Nov 2015, at 11:52 PM, Wes (N7WS) wrote: > > Why would one filter, that like just like all of the others is switched into > the circuit by a relay on each end, fail while none

Re: [Elecraft] KPA500 troubles

I guess I'll have to repeat myself. There is no requirement to have a "measured" antenna; calculated gain (loss) is permitted. It's kind of like high school algebra, you just have to show your work. With modern analysis tools such as Eznec, it is almost trivial to do so, if you know what

Re: [Elecraft] KPA500 troubles

On Wed,11/11/2015 1:30 PM, Wes (N7WS) wrote: If I use an inductively-loaded vertical monopole with a minimal ground screen over Arizona ground my "dBd gain" might well be several dB negative. In which case, I'm allowed to compensate for that, and line loss, in determining amplifier output

Re: [Elecraft] KPA500 troubles

Kpa500 on 60 is illegal unless you have a *measured and documented* VERY lossy antenna that would reduce the effective radiated power to the same as 100 watts on a dipole. The simple 99 percent answer is that on 60m SHUT OFF the Kpa500 and run 100 watts barefoot. 73, Guy K2AV On Thursday,

Re: [Elecraft] KPA500 troubles

I need to correct the information on the repair cost It was $615 with shipping not $650 as I previously reported. Jack W4GRJ On Thursday, November 12, 2015, W4GRJ wrote: Since I have never operated on 60m ever... You figure it out Jack W4GRJ On Nov 11, 2015,

Re: [Elecraft] KPA500 troubles

@mailman.qth.net Subject: Re: [Elecraft] KPA500 troubles Kpa500 on 60 is illegal unless you have a *measured and documented* VERY lossy antenna that would reduce the effective radiated power to the same as 100 watts on a dipole. The simple 99 percent answer is that on 60m SHUT OFF the Kpa500 and run

Re: [Elecraft] KPA500 troubles

To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 troubles I need to correct the information on the repair cost It was $615 with shipping not $650 as I previously reported. Jack W4GRJ On Thursday, November 12, 2015, W4GRJ <w4...@satterfield.org> wrote: Since I have never op

Re: [Elecraft] KPA500 troubles

:[hidden email]] On Behalf Of w4grj Sent: Thursday, November 12, 2015 7:14 AM To: [hidden email] Subject: Re: [Elecraft] KPA500 troubles I need to correct the information on the repair cost It was $615 with shipping not $650 as I previously reported. Jack W4GRJ On Thursday

Re: [Elecraft] KPA500 troubles

nal Message- > From: Elecraft > [mailto:elecraft-boun...@mailman.qth.net] On > Behalf Of w4grj > Sent: Thursday, November 12, 2015 7:14 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA500 troubles > > I need to correct the information on the rep

Re: [Elecraft] KPA500 troubles

components were from. 73, Eric elecraft.com _..._ > -Original Message- > From: Elecraft > [mailto:[hidden email]] On > Behalf Of w4grj > Sent: Thursday, November 12, 2015 7:14 AM > To: [hidden email] > Subject: Re: [Elecraft] KPA500 troubles > > I need

Re: [Elecraft] KPA500 troubles

Like I said, never ever operated on 60M, I mean never without the amp. When discussed with Craig at Elecraft he could not explain the failure, just referred to a component failure. Jack W4GRJ On Nov 11, 2015, at 3:59 PM, David Pratt [via Elecraft]

Re: [Elecraft] KPA500 troubles

Got the KPA500 back from Elecraft. Problem found: L22 and other components in the 60M low pass filter circuit burnt through the LPF PCB. Repair $650 later: Replaced low pass filter module and installed QSK mod. On the phone I asked what caused the failure, answer was no idea other than component

Re: [Elecraft] KPA500 troubles

Since I have never operated on 60m ever... You figure it out Jack W4GRJ On Nov 11, 2015, at 3:33 PM, Jim Brown-10 [via Elecraft] wrote: On Wed,11/11/2015 12:10 PM, W4GRJ wrote: > Got the KPA500 back from Elecraft. > Problem found: L22 and other

Re: [Elecraft] KPA500 troubles

Same in the UK, Jim. Operation on 60m does not require the use of a KPA500 unless one wants to contravene the terms of one's license. 73 de David G4DMP In a recent message, Jim Brown writes On Wed,11/11/2015 12:10 PM, W4GRJ wrote: Got the KPA500 back from

Re: [Elecraft] KPA500 troubles

*§ 97.313 Transmitter power standards*. "(i) No station may transmit with an effective radiated power (ERP) exceeding 100 W PEP on the 60 m band. For the purpose of computing ERP, the transmitter PEP will be multiplied by the antenna gain relative to a half-wave dipole antenna. A half-wave

Re: [Elecraft] KPA500 troubles

The KPA500 is a good small amp I use mine with an IC-9100 most of the time and have not had any real issues with it in 4 yrs. now. For the K3's and K2 I use Alpha amps an 87A and a newer 9500 for HF use. All I can say the brick on the key with forever in the ads they run does say a lot. But

Re: [Elecraft] KPA500 troubles

On Wed,11/11/2015 12:10 PM, W4GRJ wrote: Got the KPA500 back from Elecraft. Problem found: L22 and other components in the 60M low pass filter circuit burnt through the LPF PCB. 60M LPF??? Last I looked, the US power limit on 60M is 100W relative to a half wave dipole. Repair $650 later:

Re: [Elecraft] KPA500 troubles

t;elecraft@mailman.qth.net" <elecraft@mailman.qth.net>; "w4...@satterfield.org" <w4...@satterfield.org> Subject: Re: [Elecraft] KPA500 troubles Same in the UK, Jim. Operation on 60m does not require the use of a KPA500 unless one wants to contravene the terms of one'

Re: [Elecraft] KPA500 troubles

On Tue, 20 Oct 2015 08:58:17 -0700 (MST), ok1rp wrote: > if your KPA500 has LPF board rev. D or earlier then You will need to make > LPF TR Switch Rework REV5 modification, Elecraft parts kit: E850607. But > maybe there is another issue in your case. Apparently, I missed the OP on this. What is

Re: [Elecraft] KPA500 troubles

It has been sent to Elecraft.will advise results when I get it back SN 1767 From: mcduffie [via Elecraft] [mailto:ml-node+s365791n7609384...@n2.nabble.com] Sent: Wednesday, October 21, 2015 10:05 AM To: W4GRJ Subject: Re: KPA500 troubles On Tue, 20 Oct 2015 08:58:17 -0700 (MST), ok1rp

Re: [Elecraft] KPA500 troubles

Hi Petr, I can't find this mod for the KPA500 on the Elecraft site. In fact, I can't find any KPA500 mods. Where is it on the web site, please? I must be looking in the wrong place... 73 Stewart G3RXQ On Tue, 20 Oct 2015 08:58:17 -0700 (MST), ok1rp wrote: > Hi Jack, > > if your KPA500 has

Re: [Elecraft] KPA500 troubles

Peter, thanksamp on it's way to Elecraft. I will report results when I get it back. Jack W4GRJ On Oct 20, 2015, at 11:58 AM, ok1rp [via Elecraft] wrote: Hi Jack, if your KPA500 has LPF board rev. D or earlier then You will need to make LPF TR

Re: [Elecraft] KPA500 troubles

Hi Jack, if your KPA500 has LPF board rev. D or earlier then You will need to make LPF TR Switch Rework REV5 modification, Elecraft parts kit: E850607. But maybe there is another issue in your case. Try to read first then decide. If you want and you have SMD tools then You can try to make this

Re: [Elecraft] KPA500 troubles

Does anyone have a serial number for the changeover? I don't see anything on the Elecraft wab page. Buck k4ia K3 #101 Honor Roll 333 8B DXCC On 10/20/2015 11:58 AM, ok1rp wrote: Hi Jack, if your KPA500 has LPF board rev. D or earlier then You will need to make LPF TR Switch Rework REV5

[Elecraft] KPA500 troubles

All of a sudden my KPA500 is misbehaving. It sounds like it is arcing inside and smells the classic something is burning smell. SWR LED's are dancing upwards as it arcs. KAT500 tuner has the SWR around 1.3:1 I will probably send it off to Elecraft but thought I would ask here for suggestions to

Re: [Elecraft] KPA500 troubles

19, 2015 8:20 AM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA500 troubles All of a sudden my KPA500 is misbehaving. It sounds like it is arcing inside and smells the classic something is burning smell. SWR LED's are dancing upwards as it arcs. KAT500 tuner has the SWR around 1.3:1 I

Re: [Elecraft] KPA500 troubles

: Monday, October 19, 2015 8:20 AM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA500 troubles All of a sudden my KPA500 is misbehaving. It sounds like it is arcing inside and smells the classic something is burning smell. SWR LED's are dancing upwards as it arcs. KAT500 tuner has the SWR around 1.3

Re: [Elecraft] KPA500 troubles

-Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of W4GRJ Sent: Monday, October 19, 2015 8:20 AM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA500 troubles All of a sudden my KPA500 is misbehaving. It sounds like it is arcing inside and smells

Re: [Elecraft] KPA500 troubles

Power corrupts... Jim W6AIM . -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of w4grj Sent: Monday, October 19, 2015 6:07 AM To: 'efortner'; elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 troubles Good

Re: [Elecraft] KPA500 troubles

t-boun...@mailman.qth.net] On Behalf Of W4GRJ Sent: Monday, October 19, 2015 5:20 AM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA500 troubles All of a sudden my KPA500 is misbehaving. It sounds like it is arcing inside and smells the classic something is burning smell. SWR LED's are d

Re: [Elecraft] KPA500 troubles

19, 2015 5:20 AM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA500 troubles All of a sudden my KPA500 is misbehaving. It sounds like it is arcing inside and smells the classic something is burning smell. SWR LED's are dancing upwards as it arcs. KAT500 tuner has the SWR around 1.3:1 I

Re: [Elecraft] KPA500 troubles

Failing pin diode switch ? (not the PIN diode itself, but the semiconductor switching it) 73 Arie PA3A Op 19-10-2015 om 14:20 schreef W4GRJ: All of a sudden my KPA500 is misbehaving. It sounds like it is arcing inside and smells the classic something is burning smell. SWR LED's are