[Elecraft] (no subject)
Greg AB7R wrote: Other than that there's no difference between AFSK and DataA. Actually that turns out not to be the case if you care about the frequency you are tuned to, e.g. for spotting purposes. Data A is Upper sideband and the dial displays the suppressed carrier frequency (as it does in SSB). AFSK A, on the other hand, is Lower sideband, and the dial displays the actual Mark frequency of an RTTY signal tuned in at the selected PITCH (e.g. if PITCH is set to 2125, the display shows the carrier frequency minus 2125 Hz). So to receive a PSK31 station on 14071.5 kHz using narrow DSP filtering, in DATA A you would tune to 14070.00 kHz and set your audio tone to 1500 Hz, but in AFSK A you would tune to 14071.5 kHz and set your audio tone to 2125 Hz (assuming a PITCH setting of 2125-170) - or, to really center the signal exactly, tune to 14071.585 kHz and set the audio tone to 2210 Hz. 73, Rich VE3KI __ 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
Re: [Elecraft] K3 Vox settings per mode
Also check your VOX level in the menu. It needs to be turned up very high when using it for digital modes. You are correct to use DataA for PSK and other audio based digital modes. AFSK can be used for RTTY and gives you the advantage of using the dual peak filters. Other than that there's no difference between AFSK and DataA. AFSK also sets the dial display to the currently selected MARK frequency rather than DATA A's suppressed carrier frequency. In general, if you are using a waterfall mode, use DATA A. 73, Lyle KK7P __ 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] AFSK 75 bps by Default
Hello, I have noticed since last firmware 3.97 upgrade, when AFSK is selected (also if is from a memory)it starts at 75 bps by default, not a hard job but you have to change it to 45 bps (normal use here) every time you use RTTY, it will be more convenient to default to 45 bps or choose which one you use more. Maybe there is a way to do it but I don't know how to do. The K3 after every firmware is improving and improving, thanks a lot Elecraft! 73, Jaime, EA6NB. __ 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
Re: [Elecraft] K3 PR6 preamp
What is the noise figure of the K3 on six meters? On SSB bandwidth I barely hear a noise increase when I switch from a dummy load to my antenna. 73 Tom __ 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] Sub Receiver
How does one go about using the key pad to key-in a frequency to the Sub Receiver? I see nothing in the K3 Manual on this. Norm AAV5VW / KB8EEF $12/Month Auto Insurance Drivers in your area are paying as low as $12/m. Free Quote instantly. http://thirdpartyoffers.juno.com/TGL3141/4c209dfb8e510d5bc4m01vuc __ 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
Re: [Elecraft] AFSK 75 bps by Default
I have noticed since last firmware 3.97 upgrade, when AFSK is selected (also if is from a memory)it starts at 75 bps by default I find in AFSK as well as FSK that it is at the last used rate, 45.45 or 75 bps. This is using MCU 4.03/DSP 2.60 (the latest Beta), and selecting mode from the front panel MODE and DATA MD switches. 73, Lyle KK7P __ 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] 1st contact on my new K2
Well I finished 6959 a week ago and had been busy building a SWR/power meter to see actual output going into the antenna. Sitting at my bench during a null in kit building activity, I figured the time had come to test this puppy out. I was listening on 20m so I tuned a little off of the conversation I had been eaves dropping on and heard a strong signal - VY1/DL1FDH working all kinds of 8's,7's, 6's and an occasional 4 5. He said he was on Prince Edward Island in Nova Scotia. So I waited for all the others to give their call sign after a QRZ and threw mine out at about 5 watts SSB - NQ3RP November Quebec Three Romeo Papa with the nervousness of my very first QSO some twenty years ago. NQ3RP came the replay - I was in!! Tom, it turns out, was in Canada for a holiday from Germany and working some North American stations. I gave him a 59 and he likewise gave me a 59, I don't believe it but I will take it. He said I was very strong into P.E.I. with my 5 watts. As we signed off, my wife was standing behind me and she asked why I was shaking so much. I guess it was just the excitement of this first contact and knowing that this little radio I built had just made it's first of many contacts. Just thought I'd share this story and hope to see you on the air soon! John NQ3RP -- View this message in context: http://elecraft.365791.n2.nabble.com/1st-contact-on-my-new-K2-tp5208810p5208810.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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
Re: [Elecraft] AFSK 75 bps by Default
Upon loading the complete firmware upgrade, the AFSK was defaulted to 75 bps and required changing on a per band basis and without rhyme or reason, the reprogramming of some of the previously stored memories (with stored data mode in them). As an experiment reinstalling the firmware one piece at a time didn't change the default to 75 bps. Wes --- On Tue, 6/22/10, Lyle Johnson k...@wavecable.com wrote: From: Lyle Johnson k...@wavecable.com Subject: Re: [Elecraft] AFSK 75 bps by Default To: elecraft@mailman.qth.net Date: Tuesday, June 22, 2010, 6:16 AM I have noticed since last firmware 3.97 upgrade, when AFSK is selected (also if is from a memory)it starts at 75 bps by default I find in AFSK as well as FSK that it is at the last used rate, 45.45 or 75 bps. This is using MCU 4.03/DSP 2.60 (the latest Beta), and selecting mode from the front panel MODE and DATA MD switches. 73, Lyle KK7P __ 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 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
Re: [Elecraft] Sub Receiver
Norm, There may be better ways but what I do is use the A/B button, set the frequency and then A/B back. Rick K6LE On 6/22/2010, at 4:25 , Norman L Zinn wrote: How does one go about using the key pad to key-in a frequency to the Sub Receiver? I see nothing in the K3 Manual on this. Norm AAV5VW / KB8EEF __ 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
Re: [Elecraft] 1st contact on my new K2
Great Story John And congratts on your new build. Here's hoping you have many more such memorable contacts with 6959. Regards Nidge (G0NIG) IO93dv - Original Message - From: NQ3RP j...@mcclun.com To: elecraft@mailman.qth.net Sent: Tuesday, June 22, 2010 2:40 PM Subject: [Elecraft] 1st contact on my new K2 Well I finished 6959 a week ago and had been busy building a SWR/power meter to see actual output going into the antenna. Sitting at my bench during a null in kit building activity, I figured the time had come to test this puppy out. I was listening on 20m so I tuned a little off of the conversation I had been eaves dropping on and heard a strong signal - VY1/DL1FDH working all kinds of 8's,7's, 6's and an occasional 4 5. He said he was on Prince Edward Island in Nova Scotia. So I waited for all the others to give their call sign after a QRZ and threw mine out at about 5 watts SSB - NQ3RP November Quebec Three Romeo Papa with the nervousness of my very first QSO some twenty years ago. NQ3RP came the replay - I was in!! Tom, it turns out, was in Canada for a holiday from Germany and working some North American stations. I gave him a 59 and he likewise gave me a 59, I don't believe it but I will take it. He said I was very strong into P.E.I. with my 5 watts. As we signed off, my wife was standing behind me and she asked why I was shaking so much. I guess it was just the excitement of this first contact and knowing that this little radio I built had just made it's first of many contacts. Just thought I'd share this story and hope to see you on the air soon! John NQ3RP -- View this message in context: http://elecraft.365791.n2.nabble.com/1st-contact-on-my-new-K2-tp5208810p5208810.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.829 / Virus Database: 271.1.1/2953 - Release Date: 06/21/10 07:36:00 __ 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] K3: TX EQ and COMP of Line IN Audio in SSB Mode
Can someone please confirm that TX EQ and Compression are applied to the Line in audio while in SSB mode? I would check this personally but am away until the day before Field Day. I am preparing some voice keyer files to send from the logger to the K3 and want to be sure I don't need to EQ and compress them. Thanks! Chuck, AE4CW -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-TX-EQ-and-COMP-of-Line-IN-Audio-in-SSB-Mode-tp5209752p5209752.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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
Re: [Elecraft] K3: TX EQ and COMP of Line IN Audio in SSB Mode
Can someone please confirm that TX EQ and Compression are applied to the Line in audio while in SSB mode? The DSP treats all Tx audio sources the same: FP Mic, RP Mic, Line In and DVR. Tx EQ and/or CMP will be applied if active in the current mode. 73, Lyle KK7P __ 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
Re: [Elecraft] K3 PR6 preamp
W8JI wrote: What is the noise figure of the K3 on six meters? The noise figure of the preamp itself is typically 0.5 dB. http://www.elecraft.com/manual/PR6_Owners_Manual_Rev_A.pdf -- View this message in context: http://elecraft.365791.n2.nabble.com/Another-Happy-Customer-tp5205110p5210008.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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] AFSK 75 bps by Default
I have noticed since last firmware 3.97 upgrade, when AFSK is selected (also if is from a memory) it starts at 75 bps by default I find in AFSK as well as FSK that it is at the last used rate, 45.45 or 75 bps. This is using MCU 4.03/DSP 2.60 (the latest Beta), and selecting mode from the front panel MODE and DATA MD switches. 73, Lyle KK7P Thanks Lyle, Sorry it was MCU 4.03/DSP 2.60 and I did not save correctly the quick start memories, I have done it again band by band and now it defaults to 45. 73, Jaime EA6NB. __ 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
Re: [Elecraft] Amp connection - K3 and ACOM 1000
Jens, you are right: K3 + ACOM 1000 = excellent combination. However, I highly recommend to anyone using a tetrode amp with a swamped (i.e. untuned) input inserting of a lowpass filter BETWEEN the TX and the amp. See for instance: www.kk5dr.com/swampednetworks.htm (inspite of the title of the article, problems can even occur with a very well designed amp like the ACOM 1000) or google swamped input+filter for further info. VHF oscillations in the PA may damage the TX - ask a friend of mine who had to repair his FT1000! Better to be on the safe side... 73 - Richard - HB9ANM -- View this message in context: http://elecraft.365791.n2.nabble.com/Amp-connection-tp5205282p5210188.html Sent from the [K3] mailing list archive at Nabble.com. __ 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
Re: [Elecraft] K3 Vox settings per mode
On Mon, 21 Jun 2010 22:02:42 -0700, you wrote: AFSK also sets the dial display to the currently selected MARK frequency rather than DATA A's suppressed carrier frequency. In general, if you are using a waterfall mode, use DATA A. Please put mode dependent VOX on the 'wish list'. -- OV1A Jens Whoever ordered pizza by fax, please clean the machine. __ 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
Re: [Elecraft] K3 PR6 preamp
Bill, AS usual you have made an important observation. You made me curious about my 6m environment so: I turned off both my external preamp (RX ANT) and my internal preamp (PRE) and merely looked at s-meter reading (S=1). I removed the antenna with no discernable change in audible noise and s-meter is the same S=1. So with antenna connected I turned on internal preamp (PRE) and S=2. With internal preamp off and my external preamp* on (RX ANT) S=2/3 With both preamps on S=4 Both preamps on with antenna disconnected; S=3 So its a pretty quiet area with only one s-unit rise in noise. For comparison with a 50-ohm termination both preamps see S=4 This indicates the preamps are low-noise below a 290K source. NOW for that QRO and 8-element long-boom yagi - hmm. 73, Ed - KL7UW *Note external preamp is ARR P50VDG Gasfet 0.5 dBNF, 22-dBG -- Message: 24 Date: Mon, 21 Jun 2010 20:05:00 -0600 From: Bill VanAlstyne W5WVO w5...@cybermesa.net Subject: Re: [Elecraft] K3 PR6 preamp [was: Another Happy Customer] To: elecraft@mailman.qth.net Message-ID: e78a2106e87a4f55911f00382d8dd...@billhp9250 Content-Type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original From: K5RC t...@k5rc.cc I also added the GaAsFet 6M preamp to the station and it makes a HUGE difference on Six. It needs to be pointed out from time to time that whether the PR6 makes no discernible difference or a HUGE difference depends on one critically important variable: YOUR NOISE LEVEL! Because I live in a large-city metro area complete with big mountain-top RF outlets broadcasting thousands of kilowatts of RF (along with plenty of spurious broadband crud), my noise level on 6 meters is relatively high. Only in my quietest direction (northwest) at the quietest time of day (early morning) does adding the PR6 preamp allow me to hear anything that I can't hear just as well without it. Wouldn't it be nice to really NEED that PR6? Yeah, it sure would... but the realties are what they are. The WSJT software package (for weak-signal digital modes FSK441, JT6M, et al.) includes an easy way to roughly assess your noise level, reading out directly in dB above the receiver's internal noise floor (MDS). If, while using the K3's internal preamp, your antenna noise reads 8-10 dB or more above MDS (typical when using a decent gain antenna in a metro area), the sad fact is that the PR6 probably won't help you. If your antenna noise is only a few dB above MDS, then the PR6 might help, as it is very quiet (i.e., has a low noise figure) and could contribute to a better overall signal-to-noise ratio. On the other hand, if you are lucky enough to not really be able to hear any 6m antenna noise with the K3's internal preamp on... First, double-check to make sure you actually have connected the antenna... And if you have, you should congratulate yourself and get ready to REALLY have some fun on 6 meters once you connect in that PR6 preamp! You might also want to get a good RF power amplifier, as you will want to be able to work all the DX stations you can hear -- some of whom are running REALLY BIG QRO, trust me. You will be in no danger of being an alligator station (all mouth and no ears). Bill W5WVO DM65qh 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-600w, 432-100w, 1296-60w, 3400-fall 2010 DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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
Re: [Elecraft] Amp connection - K3 and ACOM 1000
What happens to 6M then? 73, Mike NF4L Richard Squire - HB9ANM wrote: Jens, you are right: K3 + ACOM 1000 = excellent combination. However, I highly recommend to anyone using a tetrode amp with a swamped (i.e. untuned) input inserting of a lowpass filter BETWEEN the TX and the amp. See for instance: www.kk5dr.com/swampednetworks.htm (inspite of the title of the article, problems can even occur with a very well designed amp like the ACOM 1000) or google swamped input+filter for further info. VHF oscillations in the PA may damage the TX - ask a friend of mine who had to repair his FT1000! Better to be on the safe side... 73 - Richard - HB9ANM __ 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
Re: [Elecraft] Amp connection - K3 and ACOM 1000
Mike, I am using a old Drake filter which works up to 52 MHz... Unnecessary here since we are only allowed to use 100 W on 6 m anyway! But if you can find one for that range, even - like mine - with reduced ratings on 50 MHz, it will certainly fit your needs since you won't drive your amp at more than some 60 Watts. - Richard - HB9ANM -- View this message in context: http://elecraft.365791.n2.nabble.com/Amp-connection-tp5205282p5210879.html Sent from the [K3] mailing list archive at Nabble.com. __ 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
Re: [Elecraft] Amp connection - K3 and ACOM 1000
Sorry, didn't mean sending this to the reflector - here's my answer: MI am using a old Drake filter which works up to 52 MHz... Unnecessary here since we are only allowed to use 100 W on 6 m anyway! But if you can find one for that range, even - like mine - with reduced ratings on 50 MHz, it will certainly fit your needs since you won't drive your amp at more than some 60 Watts. Mike-14 [via Elecraft] schrieb: What happens to 6M then? 73, Mike NF4L Richard Squire - HB9ANM wrote: Jens, you are right: K3 + ACOM 1000 = excellent combination. However, I highly recommend to anyone using a tetrode amp with a swamped (i.e. untuned) input inserting of a lowpass filter BETWEEN the TX and the amp. See for instance: www.kk5dr.com/swampednetworks.htm (inspite of the title of the article, problems can even occur with a very well designed amp like the ACOM 1000) or google swamped input+filter for further info. VHF oscillations in the PA may damage the TX - ask a friend of mine who had to repair his FT1000! Better to be on the safe side... 73 - Richard - HB9ANM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] /user/SendEmail.jtp?type=nodenode=5210828i=0 This list hosted by: http://www.qsl.net http://www.qsl.net?by-user=t Please help support this email list: http://www.qsl.net/donate.html View message @ http://elecraft.365791.n2.nabble.com/Amp-connection-tp5205282p5210828.html To unsubscribe from Re: Amp connection - K3 and ACOM 1000, click here (link removed) . - Richard - HB9ANM -- View this message in context: http://elecraft.365791.n2.nabble.com/Amp-connection-tp5205282p5210903.html Sent from the [K3] mailing list archive at Nabble.com. __ 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
Re: [Elecraft] Amp connection - K3 and ACOM 1000
The theory in that link is pretty far-fetched. The screen is an excellent shield for RF between the anode and grid. If the screen wasn't a nearly perfect RF shield, we would never be able to use the tetrode in a grid driven amp. It's silly to think the screen shield the control grid for months or years, and RF feedback through the screen to the control grid is so low the amp is stable, and then all of a sudden some mysterious oscillation makes the screen's shielding properties vanish for 2 seconds and allow dozens of watts back into a radio! The most common fault that wipes things like radios out, and I have seen this dozens of times, are gassy tubes. If a tube arcs internally the grids take the brunt of the fault currents. This is a repeatable common problem that can be measured and diagnosed, and requires no magical screen shielding loss. What actually happens is the tube gasses, peak anode voltage exceeds the breakdown, and the gas ionizes and causes the anode to fault to the screen and control grids. This is incredibly common in tetrodes. In grounded grid amps, when something in the tube outgases or overheats and releases vapors, the arc is from the anode to the grounded grid. The cathode normally gets very little of the fault current, so the exciter is safe. In a tetrode, especially a minimal parts design that uses and untuned resistor loaded grid, the fault current that would normally be shunted to ground blows right back through to the exciter. I designed some plasma generators that used 4CX1500B's in the 70's or 80's that had this problem when the load went high SWR before plasma ignition. The peak anode voltage would go to 10 kV or more, and if the tube was not exceptionally healthy it would arc internally. The screen would take most of the fault, but it would pull up (watched it on a scope) to 3-4 kV. The control grid would pull up to 1-2 kV, and it would blow the transistors in the IPA stage. Anything you throw in line between the PA and the exciter will help divert some of the pulse energy when the tube faults, but I sure would not bet my K3 on a low pass filter rated at high power for reliably stopping a dc pulse. My suggestion for people not wanting to rely on snake oil and myths, and to actually protect the exciter, would be to use a monoband filter for each band that has low voltage caps, spark gaps, or voltage limiting gas tubes shunting the RF lines. The low pass should have a good dc path the chassis. A minimal inductance shunt coil with a resonating capacitor across it would be the best protection, and get inside the Acom and be sure it has an anode fault current limiting resistor of proper size (about 20-30 ohms) and design (high voltage type resistor) and be sure the screen has a solid high-current fault clamping circuit. This is not a new problem with grid driven tetrodes, it is really pretty common. I'd guess I've seen this happen about 100-200 times in the past 30 years, including the fits I had with the 4CX1500B plasma generator I designed. The liability of blowing up radios from common anode-to-grid faults is one of the reasons I never built a grid driven amp with an external driver stage. By the time the grid and screen are done right to protect the radio, the amp would cost more than a grounded grid amp. 73 Tom Jens, you are right: K3 + ACOM 1000 = excellent combination. However, I highly recommend to anyone using a tetrode amp with a swamped (i.e. untuned) input inserting of a lowpass filter BETWEEN the TX and the amp. See for instance: www.kk5dr.com/swampednetworks.htm __ 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] K2 SN 6059 no SSB transmit
K2 SN 6059 no SSB transmit Folks, I’m trying to get a newly built SSB board working on my K2. K2 works on CW per Don’s set up and testing last year. I’m working through the SSB alignment on the SSB manual. Stopped on page 19 at “Fine Carrier Balance Adjustment” where it asks that I verify K2 is transmitting when PTT is pushed. K2 is set for 5 watts power, SSB /LSB mode, SSBA is 3, SSBC is 2-1, FL1 is selected. My wattmeter shows no output when I push PTT. Wattmeter shows about 5 watts when I push “Tune.” Checking for component orientation, proper component, cold solder joints, solder bridges, etc. all looked good. Checking the DC voltage levels on the troubleshooting chart revealed some discrepancies: On receive: U1-U5 all pins looked ok except : U1-6 was 5.5 v., should be 5.1 v. U1-26 was .24 v., should be 0.0 v. On transmit: U1-U5 all pins looked ok except : U1-10 was 2.8 v., should be 3.1 v. U1-13 was 5.75 v., should be 5.9 v. U1-14 was 5.6 V., should be 5.9 v. U1-16 was 3.0 v., should be 5.4 v. U1-17 was 4.1 v., should be 5.6 v. U1-28 was 5.4 v., should be 2.4 v. U2-8 was 3.0 v., should be 5.4 v. All the diode voltages looked to be OK. I am at a loss as to where to look next and what exactly to look for, and would greatly appreciate any and all comments and inputs. Thank you for your attention. Bob Hoey KI4RSE __ 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
Re: [Elecraft] K2 SN 6059 no SSB transmit
Bob, I am not certain what your problem is. Tune will transmit a carrier at the requested power level whether in SSB or CW. It is supposed to work that way. An alternate way to check for the correct carrier balance setting is to leave the mic connector open (do not connect a microphone = no audio, even noise pickup) but instead connect a key or paddles. Close the dot paddle (or straight key) -- that is the same as closing PTT on the K2, then adjust the carrier balance pot for minimum RF as indicated by a 'scope or an RF Probe connected across the dummy load, or the S-meter reading on another receiver (with a short receiving antenna). If using the RF Probe, do the carrier balance adjustment as indicated in the manual (SSB BAL) first so you do not have a level of RF at the dummy load that will damage the RF Probe. 73, Don W3FPR Robert Hoey wrote: K2 SN 6059 no SSB transmit Folks, I’m trying to get a newly built SSB board working on my K2. K2 works on CW per Don’s set up and testing last year. I’m working through the SSB alignment on the SSB manual. Stopped on page 19 at “Fine Carrier Balance Adjustment” where it asks that I verify K2 is transmitting when PTT is pushed. K2 is set for 5 watts power, SSB /LSB mode, SSBA is 3, SSBC is 2-1, FL1 is selected. My wattmeter shows no output when I push PTT. Wattmeter shows about 5 watts when I push “Tune.” Checking for component orientation, proper component, cold solder joints, solder bridges, etc. all looked good. Checking the DC voltage levels on the troubleshooting chart revealed some discrepancies: On receive: U1-U5 all pins looked ok except : U1-6 was 5.5 v., should be 5.1 v. U1-26 was .24 v., should be 0.0 v. On transmit: U1-U5 all pins looked ok except : U1-10 was 2.8 v., should be 3.1 v.U1-13 was 5.75 v., should be 5.9 v. U1-14 was 5.6 V., should be 5.9 v.U1-16 was 3.0 v., should be 5.4 v. U1-17 was 4.1 v., should be 5.6 v.U1-28 was 5.4 v., should be 2.4 v. U2-8 was 3.0 v., should be 5.4 v. All the diode voltages looked to be OK. I am at a loss as to where to look next and what exactly to look for, and would greatly appreciate any and all comments and inputs. Thank you for your attention. Bob Hoey KI4RSE __ 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
Re: [Elecraft] K2 SN 6059 no SSB transmit
Bob, On second reading of your email - what happens when you select SSB mode, press PTT and talk into the microphone? You should have RF output, but only when talking. If you have no output, check your microphone and the microphone configuration header. If the microphone requires bias, do you have the proper resistor in place? Do you have the configuration header wired correctly for the microphone pinout that you are using? Particularly the AF line. 73, Don W3FPR Robert Hoey wrote: K2 SN 6059 no SSB transmit Folks, I’m trying to get a newly built SSB board working on my K2. K2 works on CW per Don’s set up and testing last year. I’m working through the SSB alignment on the SSB manual. Stopped on page 19 at “Fine Carrier Balance Adjustment” where it asks that I verify K2 is transmitting when PTT is pushed. K2 is set for 5 watts power, SSB /LSB mode, SSBA is 3, SSBC is 2-1, FL1 is selected. My wattmeter shows no output when I push PTT. Wattmeter shows about 5 watts when I push “Tune.” Checking for component orientation, proper component, cold solder joints, solder bridges, etc. all looked good. Checking the DC voltage levels on the troubleshooting chart revealed some discrepancies: On receive: U1-U5 all pins looked ok except : U1-6 was 5.5 v., should be 5.1 v. U1-26 was .24 v., should be 0.0 v. On transmit: U1-U5 all pins looked ok except : U1-10 was 2.8 v., should be 3.1 v.U1-13 was 5.75 v., should be 5.9 v. U1-14 was 5.6 V., should be 5.9 v.U1-16 was 3.0 v., should be 5.4 v. U1-17 was 4.1 v., should be 5.6 v.U1-28 was 5.4 v., should be 2.4 v. U2-8 was 3.0 v., should be 5.4 v. All the diode voltages looked to be OK. I am at a loss as to where to look next and what exactly to look for, and would greatly appreciate any and all comments and inputs. Thank you for your attention. Bob Hoey KI4RSE __ 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 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] Help finding an RF adapter
I need to find an adapter to allow me to use a really low loss cable that I have... The cable has one male and one female RP-TNC connector and I need to get PL259 (UHF) connectors. So I need male-RP-TNC-UHF and female-RP-TNC-UHF adapters from a place that can 2nd day air ship... I'm hoping to just find 1 adapter to get the job done but I may have to go to N and then from N to UHF... But I'm looking at feeding 100ft to a 43foot vertical and using the tuner in the shack (hopefully I can use the K3 built in tuner but I'll have a spare external just in case)... But anyway this coax run that I have was given to me and its a very low loss 100 foot run for 2.4Ghz use so for 30Mhz use it'll be helpful for the reflected power that the tuner helps send back which is going to see my run as a 300 foot run of this stuff... I figure even with a little extra adapter loss the ultra low loss coax will still be a help as its the brunt of the loss in the system. ~Brett (N7MG) __ 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] Coax Loss Figures
I'm trying to find the specs on this chunk of coax that has the RP-TNC connectors on it... I'm not having a lot of luck but perhaps someone is more familar with it than I... Its just says Amphenol TWO 6001 9G Then the box just says its a Cisco Systems Ultra Low Loss Coax Assembly... And being Cisco is why I get the joy of dealing with the RP-TNC... ;) But hey the whole thing was free! ~Brett __ 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
Re: [Elecraft] Coax Loss Figures
Ultra low loss is meaningless. What is the diameter? I've been out of the industry for some time, but as I recall Amphenol didn't make bulk cable, so they likely bought the cable from Belden, Times, etc and built a cable assembly for Cisco. I think your original premise is flawed. If you want to move the match point of a 43' vertical 100' into your shack you probably should be looking for some 7/8 Helix. Wes N7WS --- On Tue, 6/22/10, Brett Howard br...@livecomputers.com wrote: From: Brett Howard br...@livecomputers.com Subject: [Elecraft] Coax Loss Figures To: elecraft elecraft@mailman.qth.net Date: Tuesday, June 22, 2010, 9:16 PM I'm trying to find the specs on this chunk of coax that has the RP-TNC connectors on it... I'm not having a lot of luck but perhaps someone is more familar with it than I... Its just says Amphenol TWO 6001 9G Then the box just says its a Cisco Systems Ultra Low Loss Coax Assembly... And being Cisco is why I get the joy of dealing with the RP-TNC... ;) But hey the whole thing was free! ~Brett __ 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 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
Re: [Elecraft] Coax Loss Figures
I think I found a sheet that says its LMR600 or at least its in a grouping that makes me think it might be LMR600. OD on the stuff is .591 by my measurements. From my calculation a 5:1 mismatch on 100 feet of LMR-400 would still get me 75watts out the antenna at 30Mhz and things only get better as I head down into 20 and 40 meters. ~Brett (N7MG) On Tue, 2010-06-22 at 20:51 -0700, Wes Stewart wrote: loss is meaningless. What is the diameter? I've been out of the industry for some time, but as I recall Amphenol didn't make bulk cable, so they likely bought the cable from Belden, Times, etc and built a cable assembly for Cisco. I think your original premise is flawed. If you want to move the match point of a 43' vertical 100' into your shack you probably should be looking for some 7/8 Helix. __ 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
Re: [Elecraft] Coax Loss Figures
On 6/22/2010 8:55 PM, Brett Howard wrote: From my calculation a 5:1 mismatch on 100 feet of LMR-400 would still get me 75watts out the antenna at 30Mhz and things only get better as I head down into 20 and 40 meters. On that basis, see if you can get some 75 ohm hardline from your local cable company - they are pulling it all out in favor of fiber optic cable and throwing it away unless the local hams ask for it. We have several hams here who use that to go up 70-100 foot towers and get out very well despite the apparent mismatch. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 __ 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
Re: [Elecraft] Coax Loss Figures
In Cisco parlance, Low Loss and Ultra Low Loss refers to classes of Aironet coax cable assemblies. On this data sheet: http://tinyurl.com/yr8fck we find these described in Table 8. If you indeed have part nbr AIR-CAB100ULL-R (where the ULL means Ultra Low Loss) then the attenuation is specified as 4.4 dB per 100 ft at 2.4 GHz. This puts it in the LMR600 class, 0.5 dB attenuation per 100 ft at 30 MHz. Bob NW8L On Tue, Jun 22, 2010 at 9:16 PM, Brett Howard br...@livecomputers.com wrote: I'm trying to find the specs on this chunk of coax that has the RP-TNC connectors on it... I'm not having a lot of luck but perhaps someone is more familar with it than I... Its just says Amphenol TWO 6001 9G Then the box just says its a Cisco Systems Ultra Low Loss Coax Assembly... And being Cisco is why I get the joy of dealing with the RP-TNC... ;) But hey the whole thing was free! ~Brett __ 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 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
Re: [Elecraft] Coax Loss Figures
I know I'm about to sound completely nuts to everyone but I'm just doing all this stuff for FD... ;) I'll probably end up using the 100' or 50' chunk of LMR400 that I have laying around here depending on how far away the antenna has to be from the tent... Being that I'm going to be running 40 radials (and don't want to staple it down) I'm going to need to keep it away from where people will be walking. I've also got 2 other wire antennas that are proven and we know are going to work well... But I always like trying stuff that I've never done before for FD. I know we're not going to be winning any awards but I've got trees freakin everywhere and I'm going to probably have 4 antennas hooked to the K3 two RX only and two TX/RX... I've never been to the location where its held this year and so thats new for me too. I just try to have fun, make sure I get a few good bites of the potluck, and get to play with more antennas and better antennas than I'll ever have at my current home. Later I'll have a better setup but for now FD is my biggest play date w/ Ham Radio every year... These are where I get to try stupid things and find out what does and doesn't work. ~Brett (N7MG) ~Brett (N7MG) On Tue, 2010-06-22 at 21:10 -0700, Phil Kane wrote: On that basis, see if you can get some 75 ohm hardline from your local cable company - they are pulling it all out in favor of fiber optic cable and throwing it away unless the local hams ask for it. We have several hams here who use that to go up 70-100 foot towers and get out very well despite the apparent mismatch. __ 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
Re: [Elecraft] Coax Loss Figures
Thats another really great data point! Knowing Cisco getting the word ultra printed on the box cost a good chunk of extra change! ;) Well heck if LMR400 is .7dB/100ft I'm not so sure that its worth mucking with finding adapters for it as if I end up having to put 2 adapters on each end to get it to something I can use there goes most of my advantage of stepping up from LMR400 to LMR600... ~Brett On Tue, 2010-06-22 at 22:19 -0600, Bob Cunnings wrote: In Cisco parlance, Low Loss and Ultra Low Loss refers to classes of Aironet coax cable assemblies. On this data sheet: http://tinyurl.com/yr8fck we find these described in Table 8. If you indeed have part nbr AIR-CAB100ULL-R (where the ULL means Ultra Low Loss) then the attenuation is specified as 4.4 dB per 100 ft at 2.4 GHz. This puts it in the LMR600 class, 0.5 dB attenuation per 100 ft at 30 MHz. Bob NW8L On Tue, Jun 22, 2010 at 9:16 PM, Brett Howard br...@livecomputers.com wrote: I'm trying to find the specs on this chunk of coax that has the RP-TNC connectors on it... I'm not having a lot of luck but perhaps someone is more familar with it than I... Its just says Amphenol TWO 6001 9G Then the box just says its a Cisco Systems Ultra Low Loss Coax Assembly... And being Cisco is why I get the joy of dealing with the RP-TNC... ;) But hey the whole thing was free! ~Brett __ 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 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 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] fun k2 debugging
So I have a K2 all put together. I thought it was receiving fine - I didn't try transmitting as I shamefully don't have CW down yet. I got the ssb kit and put it together and it didn't transmit. I stripped it out (jumpers back in place at W2, W3 and C167 is back in) and tried testing cw transmit and found a problem, but didn't fix it. So now I'm testing the voltages and finding some odd numbers. Perhaps they've been seen before: Q18 S is giving 4.9V instead of the suggested 2-3V Q18 D is giving 8V instead of 6.3 U1 pin9 and 10 give 0V U4 pin3 gives 2.4V instead of 0 U4 pin7 gives 5V instead of 0 U4 pin13 gives 0V instead of 4 U4 pin15 gives 2.5V instead of 5 U5 pin1 is 5 instead of 0 U5 pin2 is 0 instead of 5 U5 pin4 is 0 instead of 5 Suggestions on where to start? Thanks K6RJG __ 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
