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QCX and electronic keying

[email protected] All Messages By This Member #25217 I have two Heathkit electronic? keyers and wonder if they can be used on the QCX. I ask because it will work on my Heathkit SB 104a and Kenwood TS 820s but will not work on my Icom 740. The Icom takes a three way plug for use or a straight key or paddle style key but will not work if I try the electronic keyer using straight key contacts. Icom has iambic hardware installed. I can't test yet because my kit is on order. Thanks Carl
Tony Goldsworthy #25218 The QCX keying requires a 3.5mm stereo bullet plug. For straight or bug semi auto keying connect to the tip and the body of the plug. Leave the second ring unconnected. And you'll be right!? toggle quoted message Show quoted text On Tue., 17 Jul. 2018, 09:46 , <cwebs@...> wrote: I have two Heathkit electronic? keyers and wonder if they can be used on the QCX. I ask because it will work on my Heathkit SB 104a and Kenwood TS 820s but will not work on my Icom 740. The Icom takes a three way plug for use or a straight key or paddle style key but will not work if I try the electronic keyer using straight key contacts. Icom has iambic hardware installed. I can't test yet because my kit is on order. Thanks Carl
Bob Macklin #25219 开云体育 The Heathkit keyers are made for Heathkit's GRID BLOCK keying. ? They switch a NEGATIVE voltage to ground. ? Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark" toggle quoted message Show quoted text ----- Original Message ----- From: Tony Goldsworthy To: [email protected] Sent: Monday, July 16, 2018 5:57 PM Subject: Re: [QRPLabs] QCX and electronic keying The QCX keying requires a 3.5mm stereo bullet plug. For straight or bug semi auto keying connect to the tip and the body of the plug. Leave the second ring unconnected. And you'll be right!? On Tue., 17 Jul. 2018, 09:46 , <cwebs@...> wrote: I have two Heathkit electronic? keyers and wonder if they can be used on the QCX. I ask because it will work on my Heathkit SB 104a and Kenwood TS 820s but will not work on my Icom 740. The Icom takes a three way plug for use or a straight key or paddle style key but will not work if I try the electronic keyer using straight key contacts. Icom has iambic hardware installed. I can't test yet because my kit is on order. Thanks Carl
Martin DK3UW All Messages By This Member #25224 shouldn't that work in the straight key mode ?of the QCX 73 Martin
[email protected] All Messages By This Member #25226 I don't understand that. The SB-104a and HW8 are SS. Where does the grid come in to play?
Ham Radio #25233 Check the manual. ?I recall that there was an option to have positive keying as well (some rewiring may be required) -- 73, Bernie, VE3FWF
[email protected] All Messages By This Member #25237 Thanks Bernie. I will RTFM for the info. Carl, AB1ZI
Bob Macklin #25239 开云体育 The two Heathkit keyers were made for the tube units that used grid block keying. Get the manuals and read how they operate. ? They work by switching a negative voltage to ground. That's how the tube based units worked. ? Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark" toggle quoted message Show quoted text ----- Original Message ----- From: cwebs@... To: [email protected] Sent: Tuesday, July 17, 2018 6:00 AM Subject: Re: [QRPLabs] QCX and electronic keying I don't understand that. The SB-104a and HW8 are SS. Where does the grid come in to play?
Bob Macklin #25241 开云体育 Sorry, ? The HD-10 is made for grid block keying only. The HD-1410 can switch either a negative or positive line. ? You need the manuals. ? Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark" toggle quoted message Show quoted text ----- Original Message ----- From: cwebs@... To: [email protected] Sent: Tuesday, July 17, 2018 6:00 AM Subject: Re: [QRPLabs] QCX and electronic keying I don't understand that. The SB-104a and HW8 are SS. Where does the grid come in to play?
[email protected] All Messages By This Member #25244 I have the manual and built it in 1977 and still use it with my SB-104A which I built at the same time.; It is not a tube set. It also works in my Kenwood TS 820s Hybrid which is also Solid state using only tubes for finals. Sorry but these radios don't glow in the dark. LOL I had to through that in Bob. Carl
Bob Macklin #25245 开云体育 Which keyer do you have? The HD-10 or the HD-1410? ? Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark" toggle quoted message Show quoted text ----- Original Message ----- From: cwebs@... To: [email protected] Sent: Tuesday, July 17, 2018 10:37 AM Subject: Re: [QRPLabs] QCX and electronic keying I have the manual and built it in 1977 and still use it with my SB-104A which I built at the same time.; It is not a tube set. It also works in my Kenwood TS 820s Hybrid which is also Solid state using only tubes for finals. Sorry but these radios don't glow in the dark. LOL I had to through that in Bob. Carl
Tony McUmber All Messages By This Member #25246 开云体育 Hi, folks! Just my two cents fwiw. I have a HamKey electronic keyer that will key both direct and grid.? I disconnected the key from it and plugged the key directly into the QCX, putting the keyer on the shelf. ? Works fine! ? Tony N0BPA ? ? toggle quoted message Show quoted text From: [email protected] [mailto:[email protected]] On Behalf Of Bob Macklin Sent: Tuesday, July 17, 2018 12:42 PM To: [email protected] Subject: Re: [QRPLabs] QCX and electronic keying ? Which keyer do you have? The HD-10 or the HD-1410? ? Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark" ----- Original Message ----- From: cwebs@... To: [email protected] Sent: Tuesday, July 17, 2018 10:37 AM Subject: Re: [QRPLabs] QCX and electronic keying ? I have the manual and built it in 1977 and still use it with my SB-104A which I built at the same time.; It is not a tube set. It also works in my Kenwood TS 820s Hybrid which is also Solid state using only tubes for finals. Sorry but these radios don't glow in the dark. LOL I had to through that in Bob. Carl
[email protected] All Messages By This Member #25247 HI Bob, I have two of the Hd 1410s. Hi Tony, Good to know. Thank you for your time. I have a 3D printer and put together a paddle but I would much prefer my Heath keyer. What I learned on 41 years ago and still use it. I am a retired machinist and have my own shop. Built myself a very nice all brass strait key. But of coarse my fist is much better with the keyer. Carl AB1ZI
Jim W7EED All Messages By This Member #25255 Hi Carl, I just downloaded the HD-1410 keyer's manual.? This potential issue I see is the keyer's output is a Darlington transistor with a diode in series with the collector.? About the lowest voltage that it will provide is about 1.5 volts when low (marking).? This may be barely compatible with the ATmega328P (I didn't check the data sheet).? When the output is high (spacing) it will source about 4 volts but the pull-up resistor in the ATmega328P will give you 5 volts (although 4 volts is OK). If I were you, I would add a open drain CMOS buffer, similar to a 74HC05, as an additional output specifically for the QCX.? One 74HC05 input is connected to IC3 pin 12 and the corresponding output goes to the QCX's S1 pin 3 ("DIT" line).? Just ground the remaining five unused inputs of the 74HC05 and don't forget to connect the 74HC05's Vcc and Gnd connections to the power supply.? Set the QCX to "Straight Key" mode. While I obviously haven't tried this but I am confident that it will work. -- 73, Jim W7EED
Jim W7EED All Messages By This Member #25256 I just checked the ATmega328P data sheet and the highest voltage that is guaranteed to be recognized as a logic 0 is 1.5 volts (0.3Vcc, where Vcc = 5 volts).? Your keyer may work but it is on the ragged edge with no margin.? The open drain CMOS buffer is a much better idea. -- 73, Jim W7EED
[email protected] All Messages By This Member #25262 Thank you Jim and when my kit shows up I'll get a change to try that first. Be a couple weeks. Carl

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