Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
Read: http://www.comportco.com/~w5alt/cw/cwindex.php?pg=5 "CW Bandwidth" by W5ALT seems everyone in this debate has some valid points. I found this by searching on "CW bandwidth". 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubus...@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
Thread has been ended. Eric Moderator /elecraft.com/ On 3/30/2016 9:01 AM, Jim Brown wrote: Guy has it exactly right. 73, Jim K9YC On Wed,3/30/2016 8:18 AM, Guy Olinger K2AV wrote: If the rise and fall data curves used for "keying" vary their "sharpness" according to speed, then the description bandwidth increases by speed certainly does apply. But if not, the bandwidth is governed by the pulse generated by the rise and fall data, which could be the exact same from 1 wpm to 40 wpm. We are so easily diverted into our lifelong, unconscious, and utterly habitual analog thinking (note that I certainly do not give myself a free pass here). __ 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 Message delivered to eric.swa...@elecraft.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
Guy has it exactly right. 73, Jim K9YC On Wed,3/30/2016 8:18 AM, Guy Olinger K2AV wrote: If the rise and fall data curves used for "keying" vary their "sharpness" according to speed, then the description bandwidth increases by speed certainly does apply. But if not, the bandwidth is governed by the pulse generated by the rise and fall data, which could be the exact same from 1 wpm to 40 wpm. We are so easily diverted into our lifelong, unconscious, and utterly habitual analog thinking (note that I certainly do not give myself a free pass here). __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
Let's end this thread at this time in the interest of relieving other readers from overload. If you feel compelled to continue the CW b/w discussion, please take it to private email. 73, Eric /elecraft.com/ On 3/30/2016 8:18 AM, Guy Olinger K2AV wrote: One could discourse all day on what "proper" is in this context without ever a precise consensus among educated gentlemen. At some point of "ugly" we would all agree that anything that sounds like that is improper. When the only stateful levels were strictly on and off, and the rise and fall transition time amplitude curves were set by a resistor and a capacitor, one could make some simplifications in the discussion. Today, often, as in the K3, the rise and fall times and shapes of CW are DATA which goes DIRECTLY to RF via a DAC. For these the nature of the rise and fall curve is not governed by a charge/discharge time of analog components, but rather by whatever function generated the waveshape data, which is stored, *read* as needed and never generated real time. In many cases it is far more accurate to say that the rise and fall of a baud is INTRODUCED, rather than the signal is keyed. If the rise and fall data curves used for "keying" vary their "sharpness" according to speed, then the description bandwidth increases by speed certainly does apply. But if not, the bandwidth is governed by the pulse generated by the rise and fall data, which could be the exact same from 1 wpm to 40 wpm. We are so easily diverted into our lifelong, unconscious, and utterly habitual analog thinking (note that I certainly do not give myself a free pass here). I was just looking at the P3 display of some traditional BC band stations around here. A 30 over 9 station at 1490 kHz fills up 1480 to 1500. Using the K3's AM-S mode on USB side the S9 station at 1500 kHz is clearly intelligible, but the standard demodulation for 1500 is obliterated by the 1490 station. That ain't your granddaddy's AM out there any more. That's some really complicated stuff that completely fills up +/- 10 kHz and clearly not done the same from station to station. I'm going to save googling that for a free evening when I don't have something broken to fix. There is so much stuff I was taught by my WCTT Chief Engineer Elmer that I am having to set aside. 73, Guy K2AV On Wed, Mar 30, 2016 at 8:28 AM, Joe Subich, W4TV wrote: On 3/30/2016 12:21 AM, Jim Brown wrote: Unfortunately the guys who wrote the rules failed to understand the physics and the math. No Jim, you are wrong here. CW is a carrier modulated by a digital (on/off keyed) signal of a given (baud) rate. That keying will generate sidebands +/- the baud rate *just like FSK* or even AM which can be observed on a spectrum analyzer. The ITU formula is quite accurate in terms of the actual bandwidth for signals with *properly* *shaped keying*. Again, the excess bandwidth from improperly shaped keying signals (clicks) and/or amplifier distortion is something else. 73, ... Joe, W4TV __ 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 Message delivered to eric.swa...@elecraft.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
One could discourse all day on what "proper" is in this context without ever a precise consensus among educated gentlemen. At some point of "ugly" we would all agree that anything that sounds like that is improper. When the only stateful levels were strictly on and off, and the rise and fall transition time amplitude curves were set by a resistor and a capacitor, one could make some simplifications in the discussion. Today, often, as in the K3, the rise and fall times and shapes of CW are DATA which goes DIRECTLY to RF via a DAC. For these the nature of the rise and fall curve is not governed by a charge/discharge time of analog components, but rather by whatever function generated the waveshape data, which is stored, *read* as needed and never generated real time. In many cases it is far more accurate to say that the rise and fall of a baud is INTRODUCED, rather than the signal is keyed. If the rise and fall data curves used for "keying" vary their "sharpness" according to speed, then the description bandwidth increases by speed certainly does apply. But if not, the bandwidth is governed by the pulse generated by the rise and fall data, which could be the exact same from 1 wpm to 40 wpm. We are so easily diverted into our lifelong, unconscious, and utterly habitual analog thinking (note that I certainly do not give myself a free pass here). I was just looking at the P3 display of some traditional BC band stations around here. A 30 over 9 station at 1490 kHz fills up 1480 to 1500. Using the K3's AM-S mode on USB side the S9 station at 1500 kHz is clearly intelligible, but the standard demodulation for 1500 is obliterated by the 1490 station. That ain't your granddaddy's AM out there any more. That's some really complicated stuff that completely fills up +/- 10 kHz and clearly not done the same from station to station. I'm going to save googling that for a free evening when I don't have something broken to fix. There is so much stuff I was taught by my WCTT Chief Engineer Elmer that I am having to set aside. 73, Guy K2AV On Wed, Mar 30, 2016 at 8:28 AM, Joe Subich, W4TV wrote: > > On 3/30/2016 12:21 AM, Jim Brown wrote: > > Unfortunately the guys who wrote the rules failed to understand the > > physics and the math. > > No Jim, you are wrong here. CW is a carrier modulated by a digital > (on/off keyed) signal of a given (baud) rate. That keying will > generate sidebands +/- the baud rate *just like FSK* or even AM which > can be observed on a spectrum analyzer. The ITU formula is quite > accurate in terms of the actual bandwidth for signals with *properly* > *shaped keying*. > > Again, the excess bandwidth from improperly shaped keying signals > (clicks) and/or amplifier distortion is something else. > > 73, > >... Joe, W4TV > > __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
IMHO CW can be seen as 100% AM modulation which will have 2 sidebands. Therefore the bandwidth will be dependant on speed or baud rate as well as shape of the wave form. 73, Igor UA9CDC - Original Message - From: "Jim Brown" To: Sent: Wednesday, March 30, 2016 9:21 AM Subject: Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?) Unfortunately the guys who wrote the rules failed to understand the physics and the math. They were WRONG, and it is a misconception under which we have been laboring for as long as I've been a ham. It was Henry Ott who woke me up to this when I took his 3-day class on EMC around 2003-4. Henry is a VERY smart guy, one of many who came out of Bell Labs. 73, Jim K9YC On Tue,3/29/2016 1:28 PM, Joe Subich, W4TV wrote: >> On 3/29/2016 10:38 AM, Jim Brown wrote: WRONG! CW speed has NOTHING to do with bandwidth, which is determined by RISE and FALL times of the keying waveform and distortion in the RF stages. The standard word "paris" has 48 elements. That makes the baud rate for CW (48/60) x WPM or 0.80 x WPM. ITU defines the "Necessary Bandwidth" for CW as 3 or 5 times the speed in bits per second (baud rate) where 3 x is for "non fading circuits" (where the waveform does not need to be so "sharp") and 5 x for "fading circuits."See: http://http://life.itu.ch/radioclub/rr/ap01.htm part B. The same table is found in Title 97, Part 2 of the Code of Federal Regulations (FCC Rules) as §2.202(g) The constant 'K' sets the minimum bandwidth needed/occupied for the two recognized cases. Occupied bandwidth in excess of K=5 (or 400 Hz for 100 WPM) would be unacceptable due to improper keying waveforms or distortion in the RF stages. 73, ... Joe, W4TV __ 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 Message delivered to ua9...@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
On 3/30/2016 12:21 AM, Jim Brown wrote: > Unfortunately the guys who wrote the rules failed to understand the > physics and the math. No Jim, you are wrong here. CW is a carrier modulated by a digital (on/off keyed) signal of a given (baud) rate. That keying will generate sidebands +/- the baud rate *just like FSK* or even AM which can be observed on a spectrum analyzer. The ITU formula is quite accurate in terms of the actual bandwidth for signals with *properly* *shaped keying*. Again, the excess bandwidth from improperly shaped keying signals (clicks) and/or amplifier distortion is something else. 73, ... Joe, W4TV On 3/30/2016 12:21 AM, Jim Brown wrote: Unfortunately the guys who wrote the rules failed to understand the physics and the math. They were WRONG, and it is a misconception under which we have been laboring for as long as I've been a ham. It was Henry Ott who woke me up to this when I took his 3-day class on EMC around 2003-4. Henry is a VERY smart guy, one of many who came out of Bell Labs. 73, Jim K9YC On Tue,3/29/2016 1:28 PM, Joe Subich, W4TV wrote: >> On 3/29/2016 10:38 AM, Jim Brown wrote: WRONG! CW speed has NOTHING to do with bandwidth, which is determined by RISE and FALL times of the keying waveform and distortion in the RF stages. The standard word "paris" has 48 elements. That makes the baud rate for CW (48/60) x WPM or 0.80 x WPM. ITU defines the "Necessary Bandwidth" for CW as 3 or 5 times the speed in bits per second (baud rate) where 3 x is for "non fading circuits" (where the waveform does not need to be so "sharp") and 5 x for "fading circuits."See: http://http://life.itu.ch/radioclub/rr/ap01.htm part B. The same table is found in Title 97, Part 2 of the Code of Federal Regulations (FCC Rules) as §2.202(g) The constant 'K' sets the minimum bandwidth needed/occupied for the two recognized cases. Occupied bandwidth in excess of K=5 (or 400 Hz for 100 WPM) would be unacceptable due to improper keying waveforms or distortion in the RF stages. 73, ... Joe, W4TV __ 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 Message delivered to li...@subich.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
Unfortunately the guys who wrote the rules failed to understand the physics and the math. They were WRONG, and it is a misconception under which we have been laboring for as long as I've been a ham. It was Henry Ott who woke me up to this when I took his 3-day class on EMC around 2003-4. Henry is a VERY smart guy, one of many who came out of Bell Labs. 73, Jim K9YC On Tue,3/29/2016 1:28 PM, Joe Subich, W4TV wrote: >> On 3/29/2016 10:38 AM, Jim Brown wrote: WRONG! CW speed has NOTHING to do with bandwidth, which is determined by RISE and FALL times of the keying waveform and distortion in the RF stages. The standard word "paris" has 48 elements. That makes the baud rate for CW (48/60) x WPM or 0.80 x WPM. ITU defines the "Necessary Bandwidth" for CW as 3 or 5 times the speed in bits per second (baud rate) where 3 x is for "non fading circuits" (where the waveform does not need to be so "sharp") and 5 x for "fading circuits."See: http://http://life.itu.ch/radioclub/rr/ap01.htm part B. The same table is found in Title 97, Part 2 of the Code of Federal Regulations (FCC Rules) as §2.202(g) The constant 'K' sets the minimum bandwidth needed/occupied for the two recognized cases. Occupied bandwidth in excess of K=5 (or 400 Hz for 100 WPM) would be unacceptable due to improper keying waveforms or distortion in the RF stages. 73, ... Joe, W4TV __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
>> On 3/29/2016 10:38 AM, Jim Brown wrote: WRONG! CW speed has NOTHING to do with bandwidth, which is determined by RISE and FALL times of the keying waveform and distortion in the RF stages. The standard word "paris" has 48 elements. That makes the baud rate for CW (48/60) x WPM or 0.80 x WPM. ITU defines the "Necessary Bandwidth" for CW as 3 or 5 times the speed in bits per second (baud rate) where 3 x is for "non fading circuits" (where the waveform does not need to be so "sharp") and 5 x for "fading circuits."See: http://http://life.itu.ch/radioclub/rr/ap01.htm part B. The same table is found in Title 97, Part 2 of the Code of Federal Regulations (FCC Rules) as §2.202(g) The constant 'K' sets the minimum bandwidth needed/occupied for the two recognized cases. Occupied bandwidth in excess of K=5 (or 400 Hz for 100 WPM) would be unacceptable due to improper keying waveforms or distortion in the RF stages. 73, ... Joe, W4TV __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
On Tue,3/29/2016 11:28 AM, Lynn W. Taylor, WB6UUT wrote: On 3/29/2016 10:38 AM, Jim Brown wrote: WRONG! CW speed has NOTHING to do with bandwidth, which is determined by RISE and FALL times of the keying waveform and distortion in the RF stages. So, I can occupy zero bandwidth at 10,000 wpm CW and my occupied bandwidth will be the same as 5 wpm as long as the keying waveform is right? No, because even the best rise/fall waveform has SOME harmonic content, and CW speeds of 10,000 WPM have no practical meaning. But you CAN occupy extremely narrow (a few Hz) bandwidth with a steady carrier, because there's nothing to excite IMD. Bandwidth would be greater than that only to the extent that the carrier is modulated by power supply noise or phase noise. And, of course, any distortion in the RF chain will produce harmonics. 73, Jim K9YC __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
On Tue,3/29/2016 10:13 AM, Edward R Cole wrote: CW actually has bandwidth though at 5wpm probably not measurable WRONG! CW speed has NOTHING to do with bandwidth, which is determined by RISE and FALL times of the keying waveform and distortion in the RF stages. I strongly agree that amplifier output power should NEVER EVER be set using AGC. It should ALWAYS be set by setting drive power for the desired output, but always staying below the power level that increases amplifier non-linearity (distortion). The use of AGC to set amplifier power has been considered a bad thing for at least 35 years -- the operating manual for my Ten Tec Titans says not to use it that way. If you look at the schematics (in the manual) you'll find K4XU's initials on them. Thank you, Dick! The ONLY good way to use AGC is to protect the amplifier when something fails in the antenna system (by reducing drive from the transceiver). Yes, some rigs produce power spikes at the beginning of a transmission. Those are bad rigs, and have no business being used to drive a power amp! If you want to run an amp, buy a REAL radio. :) 73, Jim K9YC __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
I thought the best way to drive an amplifier was to increase drive until output no longer increased proportional to input; eg output increases 3-dB with an 3-dB increase in drive is linear. Isn't the point the increase drops 1-dB the upper limit? That is how I determine best drive level on VHF linear amps. Most folks run up drive until they reach saturation (no change in output with increased drive) and then operate SSB there. No wonder their voice peaks are cut off causing splatter. BTW high speed CW should not be run at saturated power, either. CW actually has bandwidth though at 5wpm probably not measurable ALC was a good concept that never worked very well (negative feedback gain control). ALC meter on the K3 is useful for setting audio drive just to the point ALC begins to act (four bars with 5th flickering). But I guess all of you know that - right? 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubus...@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
I have a THP HL-1.2KFX that I used before the acquisition of my K3. It is a reliable and resilient amp and I have had the ALC connected to the K3 for a year. However I tend to take Don Wilhelms advice and there have been times when the ALC and SWR inputs to the AMP’s logic seem to fight each other, so I just disconnected the ALC and will report any issues….silence = happiness. I mourn the the shutdown THP after the earthquake/floods. It was a terrific company with a lot of great products with leadership in the mould of Elecraft. Alan/K6ADG __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
John, I don't know what other folks do, and I don't have an amplifier, BUT --- Using amplifier ALC is a good way to create splatter on the bands, so it should not be used if you are to present a clean signal. ALC can be used as a crude means of power control - the amplifier is overdriven, so ALC activates and the drive power is reduced at the driving transceiver. That is the "bad" use of ALC. I know of at least one amplifier manufacturer which instructs the user to run the driving transceiver at full power and let the amplifier ALC control its power output - don't do that, it causes splatter on the bands because that control mechanism is not instantaneous - you go into an overdrive condition before the power can be reduced. However, some solid state amplifiers also use it as a means to shut down the driving transceiver if it detects a fault condition. The use of ALC for that purpose is justified IMHO. Most amplifiers have a control which can set the ALC level. So if you choose to use the ALC line for amplifier fault protection, then set that level well above the point where ALC will be activated by the amplifier for power control purposes - otherwise just adjust the drive power of the K3 to drive the amplifier to the desired power output and do not connect the ALC. Just a point of opinion, I think the amplifier designers who like to depend on ALC for amplifier fault protection should find a different way. If the amplifier is in a condition where it needs to reduce the power, that should be done in the amplifier itself without reliance on any external device, and that includes sending ALC to the driving transceiver. 73, Don W3FPR On 3/28/2016 4:51 PM, John Shadle wrote: I'm considering adding a THP HL-1.2KFX solid state amp to the K3S station I have, and was wondering how others have done this. There seems to be conflicting info on the "right way" to do things. 1. The THP manual states that ALC should be used to control the amp, but 2. Elecraft support (and documents) suggest that ALC should not be used for any amps. Of course, that begs the question "Why is ALC included at all on the K3/K3S?", but...anyway. Elecraft support suggested I ask the reflector what other folks do, so I am. Looking forward to your replies. __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)
I'm considering adding a THP HL-1.2KFX solid state amp to the K3S station I have, and was wondering how others have done this. There seems to be conflicting info on the "right way" to do things. 1. The THP manual states that ALC should be used to control the amp, but 2. Elecraft support (and documents) suggest that ALC should not be used for any amps. Of course, that begs the question "Why is ALC included at all on the K3/K3S?", but...anyway. Elecraft support suggested I ask the reflector what other folks do, so I am. Looking forward to your replies. Thanks! -john NE4U __ 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 Message delivered to arch...@mail-archive.com