K2/100 whats the min power and what current drain?
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Hi All
I only have a QRP K2 but just would like to know what the min power a K2/100 will run at with the power know turned down , and what current does it draw at low power compared to the barefoot K2? Thanks Paul M0BMN -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.13.10/189 - Release Date: 30/11/2005 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: K2/100 whats the min power and what current drain?
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Paul asked:
I only have a QRP K2 but just would like to know what the min power a K2/100 will run at with the power know turned down , and what current does it draw at low power compared to the barefoot K2? ------------------------- When you turn the POWER below 10 watts the KPA100 is automatically switched out of the circuit, so it's just a "barefoot" QRP K2 at those power levels. If you're providing 13 VDC only to the high-current power connector on the KPA100, it'll draw between 200 and 400 mA even when it's not being used. If you want, you can power the K2 QRP circuits through the small power connector on the back of the K2 and power the KPA100 separately through its high-current Anderson connector. If you do that, when you remove power from the Anderson connector the current drain to the K2 is the same as any "QRP K2". You'll get a warning on the K2 display that you don't have amplifier power. To switch to QRO mode all you need to do is furnish 13 vdc to the Anderson connector on the KPA100. The system is designed to work FB that way with two power supplies. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: K2/100 whats the min power and what current drain?
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In reply to this post by m0bmn
Paul,
The low power setting remains the same - when the KPA100 is not powered (but the base K2 is through a separate power supply), the QRP K2 will operate just the same as if the KPA100 is not attached, but if the KPA100 is powered on, th K2 power control will increment in steps of 0.5 watts instead of the 0.1 watt steps - up to the 10 watt level - the KPA100 kicks in at 11 watts and then the increment is in 1 watt steps. The receive current on my fully loaded K2 is 0.34 Amps with the KPA100 disconnected, increases to 0.44 to 0.46 amps with the KPA100 attached and not powered, and goes up to 0.50 Amps with the KPA100 powered on. The receive current does not vary with the power setting. 73, Don W3FPR > -----Original Message----- > > I only have a QRP K2 but just would like to know what the min > power a K2/100 > will run at with the power know turned down , > > and what current does it draw at low power compared to the barefoot K2? > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: K2/100 whats the min power and what current drain?
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I don't' see the message here, but Jack, W6FB, e-mailed me off-list that the
parasitic drain continues from the low-current supply as long as the KPA100 is installed. Only the PA transistors get current only from the high-current connector. That sounds like what you're saying Don. I thought the whole KPA100 was isolated by the diodes when the only power was coming from the low-current 13 vdc connector on the K2. That's the value of posting to the list with everyone watching! Thanks for catching my error. Ron AC7AC -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Don Wilhelm Sent: Thursday, December 01, 2005 5:22 PM To: Paul Webb; [hidden email] Subject: RE: [Elecraft] K2/100 whats the min power and what current drain? Paul, The low power setting remains the same - when the KPA100 is not powered (but the base K2 is through a separate power supply), the QRP K2 will operate just the same as if the KPA100 is not attached, but if the KPA100 is powered on, th K2 power control will increment in steps of 0.5 watts instead of the 0.1 watt steps - up to the 10 watt level - the KPA100 kicks in at 11 watts and then the increment is in 1 watt steps. The receive current on my fully loaded K2 is 0.34 Amps with the KPA100 disconnected, increases to 0.44 to 0.46 amps with the KPA100 attached and not powered, and goes up to 0.50 Amps with the KPA100 powered on. The receive current does not vary with the power setting. 73, Don W3FPR > -----Original Message----- > > I only have a QRP K2 but just would like to know what the min power a > K2/100 will run at with the power know turned down , > > and what current does it draw at low power compared to the barefoot > K2? > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Ron D'Eau Claire wrote:
> I don't' see the message here, but Jack, W6FB, e-mailed me off-list that the > parasitic drain continues from the low-current supply as long as the KPA100 > is installed. Only the PA transistors get current only from the high-current > connector. That sounds like what you're saying Don. Yes, the birdie-generator (oops, bias oscillator) which provides high voltage for the diode T/R switch and -12v for the RS232 port must run even if the KPA100 is inactive. It gets its power through the 12CTRL line which is in the ribbon cable. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: K2/100 whats the min power and what current drain?
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In addition to the circuit elements that Vic pointed out, the KPA100 LPF
relays (they are not latching) must be held in the active state for the current band, and that takes a bit of the current too (from the 12CTRL line which originates in the base K2). 73, Don W3FPR > -----Original Message----- > > Ron D'Eau Claire wrote: > > I don't' see the message here, but Jack, W6FB, e-mailed me > off-list that the > > parasitic drain continues from the low-current supply as long > as the KPA100 > > is installed. Only the PA transistors get current only from the > high-current > > connector. That sounds like what you're saying Don. > > Yes, the birdie-generator (oops, bias oscillator) which provides high > voltage for the diode T/R switch and -12v for the RS232 port must run > even if the KPA100 is inactive. It gets its power through the 12CTRL > line which is in the ribbon cable. > > -- > 73, > Vic, K2VCO > Fresno CA > http://www.qsl.net/k2vco > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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