[Elecraft] Power Out
Can I have different “Power Out” levels on each antenna? i.e. 25W out per band on antenna 1 and 100W out per band on antenna 2? If not is this a feature that could be added/needed/wanted in the future? K6CG __ 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: http://www.qsl.net/donate.html
[Elecraft] power out variation using FSK-D
I notice that there is a slight power output variation between the two FSK tones (as seen on an external meter, there isn't enough resolution on the K3's meter to see it). Is this a result of filter ripple or is something else at work here? (since not AFSK not EQ or sound card settings). Mark n2qt __ 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: http://www.qsl.net/donate.html
[Elecraft] Power out problems Rev 2.72
Hello, a friend of mine found a strange problem with his new K3. His setup: 1. PSK31 (DATA-A), LINE IN = 5. PWR OUT set to 120 W, measured PWR at PWR-meter: 5 W. 2. Then tap A/B. Switch to SSB. Measured PWR=30 W. After about 25-30 sek of whistling into the microphone PWR out is 120 W. 3. Tap A/B again and switch back to DATA-A, PWR now is 25 W. 4. Switch off and back on the Rig and you will start again at point 1...??? Any idea? ATU is on the whole time, however SWR is about 1,5. Tested was on 80 and 40m with no difference. vy 73! Frank, DD7ZT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Power out problems Rev 2.72
Frank, It looks as if your friend is trying to set the K3 up for PSK31 using DATA A. If so, I believe he is approaching it the wrong way. The procedure I would recommend (subject to any correction from the gurus at Elecraft) is as follows: 1. Set the PWR control to approximately 50 watts. You do not want to transmit an average power in PSK31 higher than 50-60 watts, because if you do, instantaneous peaks will exceed the PA's linear range, resulting in gain compression and splatter. 2. Set the K3's meter to display ALC. From your PSK31 software, transmit an idle PSK31 signal at approximately 1500 Hz audio frequency. Advance the LINE IN level (using the MIC control) until the ALC meter displays 4 bars or perhaps slightly more. YMMV, but as far as I can tell once the display shows 4 bars, increasing the LINE IN control further seems to have no significant effect on the output, although the ALC meter may continue to increase to about 6 bars. The value of the LINE IN level needed will depend on the amplitude of the audio signal coming out of the sound card. 3. Now set the K3's meter to display RF power. While transmitting an idle PSK31 signal, adjust the PWR control as necessary to reduce the power indication to 50 watts (5 bars). If you prefer, you can program an offset into the CONFIG:TXG VCE configuration menu item to adjust the relationship between the setting of the PWR control and the K3's power output. For example, I find that with firmware version 2.73 and CONFIG:TXG VCE set to 0.0 dB, I have to reduce the PWR control to between 35W and 40W to hold the power reading to 50W. If I set CONFIG:TXG VCE to -2.0 dB (negative value), I get 50W indicated output with the PWR control set at 50W. 4. The actual power output will depend on the firmware version, the audio frequency used in the PSK31 software and the frequency response of your K3's transmit filter. I would suggest adjusting CONFIG:TXG VCE so that a PWR setting of 50W produces a maximum output reading of no more than 60W (6 bars) at any audio frequency you are likely to use in PSK31, and no more than 50W (5 bars) at the audio frequencies you use most often. Explanation (based on my imperfect understanding of how the K3's ALC works): In most radios with analog ALC circuits, the ALC meter indicates whether or not there is any gain compression. Your goal is to operate below the point where the ALC meter starts to move. You can set the power control on these radios to full power without ill effects in PSK31, as long as you keep the audio drive low enough to avoid causing any ALC indication. The K3's DSP ALC does not work by clipping the output signal; instead, it adjusts the drive level to bring the output power back to the requested level. Therefore, you want the K3's ALC to be in control to keep output power at the desired level. When there are no bars on the ALC meter, that means that the DSP ALC is not in control. A reading of 4 or more bars on the ALC meter indicates that the DSP ALC is controlling the K3's output. If you are able to produce an idle PSK31 signal whose average power is higher than one-half the K3's maximum power capacity, the PA will clip instantaneous peaks. In order to avoid this, you want the DSP ALC to be controlling the output such that the average output power is low enough to avoid significant gain compression on instantaneous peaks; I would recommend a value of no more than 50-60W average power output. On my K3, observing the output with a KF6VSG PSKMeter, a 50W output signal is acceptably clean (around -28 dB IMD). IMD increases rapidly as power increases; it is not as good but still tolerable at 60W, and increases to unacceptable levels at higher powers. The difference in signal power between 60W and 50W is 0.8 dB, or about one-eighth of an S-unit - unlikely to be observable at the receiving station. The corresponding increase in IMD is about three times this large (2.4 dB), and at 60W output the IMD is reaching the point where it is becoming observable on the waterfall. If I have got this wrong, I would certainly appreciate corrections. 73, Rich VE3KI DD7ZT said: Hello, a friend of mine found a strange problem with his new K3. His setup: 1. PSK31 (DATA-A), LINE IN = 5. PWR OUT set to 120 W, measured PWR at PWR-meter: 5 W. 2. Then tap A/B. Switch to SSB. Measured PWR=30 W. After about 25-30 sek of whistling into the microphone PWR out is 120 W. 3. Tap A/B again and switch back to DATA-A, PWR now is 25 W. 4. Switch off and back on the Rig and you will start again at point 1...??? Any idea? ATU is on the whole time, however SWR is about 1,5. Tested was on 80 and 40m with no difference. vy 73! Frank, DD7ZT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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:
[Elecraft] POWER OUT K3
Hi folks I just received my K3 and I don't know why but I can not find a way to leverage the power from low power to high power. The maximum power I can have is 12 Watts Can somebody give me a help? 73 Oms PY5EG ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] POWER OUT K3
In the main menu set KPA3 to PA NOR Manuel WSSB -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of py5eg Sent: Friday, April 25, 2008 9:03 PM To: elecraft@mailman.qth.net Subject: [Elecraft] POWER OUT K3 Hi folks I just received my K3 and I don't know why but I can not find a way to leverage the power from low power to high power. The maximum power I can have is 12 Watts Can somebody give me a help? 73 Oms PY5EG ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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] Power out with ATU
I have a K2, #5943, with the internal ATU installed. Whatever power output I set the Power control for, the rig always delivers about .5-1 W more, according to its own display. Is this a calibration error on the ATU, or just something it does? Example: I set power for exactly 2.0 but the rig will always put out 2.4-2.5 according to the ATU's wattmeter. -- Immanuel Kant but Kubla Khan. 73, Mike KCØTQX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] Power out ratings of K2 / 100 finals?
I got curious so I dug up the data sheets on the K2 finals and the KPA100 finals. K2 finals say 20 watts output, KPA100 say 100. Is that for one transistor or two? If two, that suggests the K2 and KPA100 are really taking it easy on those parts and they should last a long time, right? - Keith N1AS - ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Power out ratings of K2 / 100 finals?
Kieth, I see 10 to 14 watts for the 2SC1969 and 100 watts for the 2SC2879 on the data sheets I have here. That is for one transistor - and yes, the K2 design is using them in a conservative manner. To get more out of them, they have to be driven harder and the power dissipation goes up drastically (the heat sink may no longer be adequate) and the intermodulation distortion increases a lot. Plus, those ratings are into an ideal load (read perfect SWR=1). Hams seem to have a desire to run devices near their maximum ratings, but even though they can be made to provide more power, the consequence is reduced component life and durability - and solid state stuff goes POOF quickly if th heat cannot be conducted away fast enough. A conservative design should allow the components to live a good long life unless they are subjected to abuse of some nature. 73, Don W3FPR -Original Message- I got curious so I dug up the data sheets on the K2 finals and the KPA100 finals. K2 finals say 20 watts output, KPA100 say 100. Is that for one transistor or two? If two, that suggests the K2 and KPA100 are really taking it easy on those parts and they should last a long time, right? - Keith N1AS - -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.430 / Virus Database: 268.15.3/562 - Release Date: 12/1/2006 1:12 PM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] Power out on K2 # Power out on Wattmeter
hi all, my friend Egon purchased a used K2 and he asks me what could be the cause that the power he is reading on the Watt meter is always about double as high as the numbers on the K2 display. I checked this here with my K2 and I also find a difference, but usually not so high than he. I also found out that the difference is not the same on different bands. I use a Daiwa CN620A cross needle meter with the 20W setting. Both transceivers otherwise work fine. Is there an explanation or something to fix? 73! de Werner OE9FWV -- Einige halten Fussball für einen Kampf auf Leben und Tod. Aber ich versichere Ihnen, dass es weit ernster ist. Bill Shankley Email powered by Pegasus Mail free at http://www.pmail.com Homepage: http://www.qsl.net/oe9fwv/ Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Power out on K2 # Power out on Wattmeter
hi Jim, k4zm schrieb am 19 Mar 2006 um 17:13: Does the K2 have a KAT2 installed in it? there is no tuner in either rig. 73! de Werner OE9FWV -- The problem with being in the middle of the road is that you tend to get run over. Email powered by Pegasus Mail free at http://www.pmail.com Homepage: http://www.qsl.net/oe9fwv/ Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Power out on K2 # Power out on Wattmeter
Werner, If the K2 is in fact a K2/100, it could be that the wattmeter in the KPA100 needs to be calibrated. On the other hand, if this is a QRP K2, the power output indication on the K2 is a simple RF Probe and is very sensitive to the actual load (antenna) impedance. If you use the QRP K2 (without the KAT2 or KAT100) driving a good 50 ohm non-reactive dummy load, you should find close agreement between the K2 indication and the wattmeter - in fact, if you do not, I would blame either the dummy load or the external wattmeter rather than the K2. Sorry, but with the information available, there is no single answer, I can only guess. 73, Don W3FPR -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Dr. Werner Furlan Sent: Sunday, March 19, 2006 2:00 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Power out on K2 # Power out on Wattmeter hi all, my friend Egon purchased a used K2 and he asks me what could be the cause that the power he is reading on the Watt meter is always about double as high as the numbers on the K2 display. I checked this here with my K2 and I also find a difference, but usually not so high than he. I also found out that the difference is not the same on different bands. I use a Daiwa CN620A cross needle meter with the 20W setting. Both transceivers otherwise work fine. Is there an explanation or something to fix? 73! de Werner OE9FWV -- Einige halten Fussball für einen Kampf auf Leben und Tod. Aber ich versichere Ihnen, dass es weit ernster ist. Bill Shankley Email powered by Pegasus Mail free at http://www.pmail.com Homepage: http://www.qsl.net/oe9fwv/ Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.2.5/284 - Release Date: 3/17/2006 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Power out on K2 # Power out on Wattmeter
hi Don, sorry for the missing data - the K2's are both without PA and ATU. The next test will be side by side on a dummy load. 73! de Werner OE9FWV -- You speak of beer, you speak my language -- Al Bundy PGP-Key: http://www.qsl.net/oe9fwv/furlan.asc Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 K2 #5203 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] Power Out of KPA100
Hi all, I am wringing out my KPA100 and have come up with the following numbers. I did do the 2 capacitor mod while building the KPA100. I used the dummy load in my MFJ-949E, which I measure at 56 Ohms. I connected the K2 to a Mirage MP1 Wattmeter to the KPA100 in the EC2 case, to the KAT100, to the MFJ-949E. I figured the KAT100 would offset the 50 Ohm deviation in the dummy load. For the SSB measurements I used a Kenwood MC43 mic. The number in is the requested power from the K2. For SSB, for this very scientific test ;o) I said Ah into the mic. SSB 80M 3773100W80 40M 7251100W99 30M 10114 90W 110 20M 14290 70W 110 17M 18136 100W90 15M 21350 110W100 12M 24950 100W110 10M 28400 100W110 CW 80M 3600105W60 40M 7050110W70 30M 10115 98W 110 20M 14050 100W70 17M 18080 100W70 15M 21100 100W60 12M 24900 100W60 10M 28050 110W70 Scott at Elecraft sent me 2 new low inductance resistors just in case, but I already replaced the 2 caps with higher values (5600 pf), and didn't save the old caps. But then again that was for a fix for 20M and 17M. I repeated the SSB 30M and 20M test without the KAT100 in line and got the same results. So it looks like 30M and 20 M output is a little low on SSB, but is fine on CW. Any comments? Thanks, Steve, W2MY -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.7/60 - Release Date: 7/28/2005 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Power Out of KPA100
Steve, Put in the new resistors Scott sent to you (yes, the 5600 pf capacitors can stay) and then calibrate the wattmeters in the KPA100 and the KAT100 and you should be all set. If you can buy, beg, borrow or otherwise acquire a good 50 ohm non-reactive dummy load you will find the wattmeter calibration much more accurate. I recommend using an RF Probe to measure the RF Voltage at the dummy load rather than relying on any wattmeter - even the best are spec'ed for only 5% of full scale when properly calibrated, so on a 100 watt scale, even the best can be off by as much as 5 watts - the run of the mill wattmeters can only be trusted to 20% of full scale (20 watts possible error on a 100 watt scale) until proven otherwise. 73, Don W3FPR -Original Message- Hi all, I am wringing out my KPA100 and have come up with the following numbers. I did do the 2 capacitor mod while building the KPA100. I used the dummy load in my MFJ-949E, which I measure at 56 Ohms. I connected the K2 to a Mirage MP1 Wattmeter to the KPA100 in the EC2 case, to the KAT100, to the MFJ-949E. I figured the KAT100 would offset the 50 Ohm deviation in the dummy load. For the SSB measurements I used a Kenwood MC43 mic. The number in is the requested power from the K2. For SSB, for this very scientific test ;o) I said Ah into the mic. SSB 80M 3773100W80 40M 7251100W99 30M 10114 90W 110 20M 14290 70W 110 17M 18136 100W90 15M 21350 110W100 12M 24950 100W110 10M 28400 100W110 CW 80M 3600105W60 40M 7050110W70 30M 10115 98W 110 20M 14050 100W70 17M 18080 100W70 15M 21100 100W60 12M 24900 100W60 10M 28050 110W70 Scott at Elecraft sent me 2 new low inductance resistors just in case, but I already replaced the 2 caps with higher values (5600 pf), and didn't save the old caps. But then again that was for a fix for 20M and 17M. I repeated the SSB 30M and 20M test without the KAT100 in line and got the same results. So it looks like 30M and 20 M output is a little low on SSB, but is fine on CW. Any comments? Thanks, Steve, W2MY -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.7/60 - Release Date: 7/28/2005 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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 -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.7/60 - Release Date: 7/28/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.7/60 - Release Date: 7/28/2005 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] Power out in Alignment, Part III
Elecrafters I'm at the alignment part III for my K2 #4155. The first step, on 40 mtrs setting Power control for 2 watts and adjusting L1 and L2 for maximum power out in Tune mode gives me 3 watts. When I change Power setting first to 5 watts then to 10 watts in Tune mode I get about 6+ and 12+ watts respectively. At 10 watt setting current in Tune is about 2.25. Should I back off on L1 and L2 to give only 2 watts with Power set to 2 or should I leave it at max? Thanks in advance for your advice. Joe K4NVJ K1#764 K2#4155 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
