Re: [Elecraft] Drive Control - K3 and FPA-1500

2022-11-07 Thread N2TK, Tony via Elecraft 
When you change bands and key the K3/KPA1500 do you see a spike in power and 
then the power out settles down and is fine till you switch bands? Then you 
have a spike in power on the initial keying?
Just wondering 
N2TK, Tony

Sent from my iPhone

> On Nov 7, 2022, at 7:54 AM, Kent Trimble  wrote:
> 
> Pete ...
> 
> Overshoot was a problem in the early K3s (plural, not S), but was corrected 
> in firmware.  Surely the K3S never had it at all.
> 
> But apparently so for yours.
> 
> If you have the latest (i.e. final) firmware installed, a quick phone call to 
> Elecraft support should solve it.  There are just too many of both rigs out 
> there for it to be a problem anymore.
> 
> 73,
> Kent
> K9ZTV
> 
> 
>> On 11/7/2022 7:31 AM, Pete Smith N4ZR wrote:
>> Thanks, Kent - that's what I thought, but it doesn't seem to be working. I 
>> generally use the internal tuner, and I was hopping around a lot within 
>> bands, but unfortunately I didn't collect data on which hops produced 
>> warnings - either excessive current warnings or over-power readings on the 
>> LED scale.
>> 
>> 73, Pete N4ZR
>> Check out the new Reverse Beacon Network
>> web server at.
>> For spots, please use your favorite
>> "retail" DX cluster.
>> 
>>> On 11/6/2022 9:29 PM, K9ZTV wrote:
>>> Pete ...
>>> 
>>> You have to first set the drive manually per-band on the K3. Once that is 
>>> done, the K3 adjusts its drive to whatever you have set it to when changing 
>>> to that new band.
>>> 
>>> 73,
>>> Kent
>>> K9ZTV
>>> 
 On Nov 6, 2022, at 7:05 PM, Pete Smith N4ZR  wrote:
 
 Just finished SS, and on many occasions when switching bands I found 
 myself overdriving the KPA-1500 on the new band.  No harm done, but I 
 thought the K3/KPA-1500 combination was supposed to manage drive on a 
 per-band basis.  Did I get that wrong?
 
 -- 
 73, Pete N4ZR
 Check out the new Reverse Beacon Network
 web server at.
 For spots, please use your favorite
 "retail" DX cluster.
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Re: [Elecraft] KPA1500 replacement devices

2022-11-01 Thread N2TK, Tony via Elecraft 
What are the current part vs. the original part number in the 1500?
N2TK, Tony

Sent from my iPhone

> On Nov 1, 2022, at 6:23 PM, M Cresap via Elecraft  
> wrote:
> 
>  Hi Hal
> I see the Rds difference. Wouldn't the higher Rds be compensated by the 
> better Rth (thermal resistance from junction to case) spec in the ART devices?
> 73, Mike, W3IP
> 
>On Tuesday, November 1, 2022 at 03:15:09 PM EDT, Dynolab 
>  wrote:  
> 
> While the higher voltage ratings of the ART1K6 or ART2K0 series looks very
> attractive, it is extremely important to remember that heat is the number
> one killer of LDMOS RF power FETs!
> That being said, take a look at the specifications of the ART1K6 and ART2K0
> and note that the Rds(on) drain-source on-state resistance of these devices
> is significantly higher than that of the devices presently being used in the
> KPA1500.
> And this higher Rds(on) would result in higher drain-source saturation
> voltage when the amplifier is running near its limits which would in turn
> result in higher heat dissipation.
> It is therefore possible that the ART1K6 or ART2K0 devices may be less
> reliable than the devices currently being used in the KPA1500.
> 
> 73,
> Hal
> W7YNC
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of M Cresap via Elecraft
> Sent: Tuesday, November 01, 2022 10:21 AM
> To: Elecraft@mailman.qth.net
> Subject: [Elecraft] KPA1500 replacement devices
> 
> Anyone have an educated guess whether the ART1K6xx or ART2K0xx devices would
> be a drop in replacement for the currently used device in the KPA1500? Most
> of the interesting specs are within 10% of the current device, the open loop
> gain may be a dB or two higher (if the data sheets are really comparing
> apples to apples). 
> 
> The main attraction of the ART1K6 and ART2K0 devices is the higher peak
> voltage handling capability - 177 or 200 volts vice 135 volts for the
> current device. Maybe a higher peak voltage capability will keep the
> amplifier out of the repair shop due to external events like arcing baluns
> or antennas flexing in the wind.
> 
> The package styles are identical, the ART devices are in stock from a few of
> your favorite distributors, similar price to the current device, maybe the
> quiescent bias voltage would have to be tweaked a bit...
> 
> 73, Mike, W3IP
>   
>   -
> 
> 
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Re: [Elecraft] KPA 500

2022-03-23 Thread N2TK, Tony via Elecraft 
Ken
You got me thinking. With my pair of K3’s and KPA500 and 1500 I can’t remember 
the last time I used a rig or amp to select a band. I usually use a logging or 
contesting program to click on a callout or type in a freq.
N2TK, Tony

Sent from my iPhone

> On Mar 23, 2022, at 5:00 PM, Ken K6MR  wrote:
> 
>  "They are a "bandaid" for the lack of band buttons on the K3."
> 
> I've always considered "band buttons" on any radio to be the worst possible 
> use of front panel space I can think of.  I always operate with a logging 
> program open, and it's far easier to just type in the frequency I want 
> without removing my hands from the keyboard.
> 
> I think with the amplifier they just had so much front panel space available 
> that they just couldn't think of anything else to put there.  In the years 
> I've had KPA500s and a KPA1500 I have yet to touch them.  To each his own.
> 
> Ken K6MR
> 
> 
> From: elecraft-boun...@mailman.qth.net  on 
> behalf of Andy Durbin 
> Sent: Wednesday, March 23, 2022 1:18 PM
> To: elecraft@mailman.qth.net 
> Subject: [Elecraft] KPA 500
> 
> "It’s also worth mentioning that if the radio and the amp are hard wired 
> together, changing the band using the buttons on the front of the amp 
> automatically changes the band on the radio."
> 
> It should be possible to disable the KPA 500 band buttons but it isn't.  They 
> are a "bandaid" for the lack of band buttons on the K3.  The best I could do 
> was set the KPA 500 back to TS-590 TX frequency in under 1 second if a KPA 
> 500 band button was accidentally pressed.
> 
> 0:06:08.474  New KPA_band  - ^BN03;
> 0:06:08.590  Sending ^BN08; to KPA500
> 0:06:08.975  New KPA_band  - ^BN08;
> 
> 
> Andy, k3wyc
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Re: [Elecraft] K3 strange overshoot

2022-02-23 Thread N2TK, Tony via Elecraft 
Thanks Steve
Tony

Sent from my iPad

> On Feb 22, 2022, at 8:19 PM, Steve Hall <99sun...@gmail.com> wrote:
> 
> Tony,
> For full output, my KPA1500 requires 27 to 30 Watts depending on the band.
> I have not observed any overshoot on either my K3s or K4D.
> Steve, WM6P
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