K3 Enhancements and Application Notes Page
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K3 Enhancements and Application Notes Page
 
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At long last we have the K3 Enhancements and Application Notes Page, and
K3 enhancements parts kits order form, on-line. :-) See: http://www.elecraft.com/K3/k3_app_notes.htm and: http://www.elecraft.com/order_form_parts.htm#K3%20Parts There are .pdf documents for each item, along with the approximate date and s/n of any K3 enhancement phase in. 73, Eric WA6HHQ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 Enhancements and Application Notes Page
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YAYY! Finally, I get to solder on the radio!
73, doug Date: Thu, 27 Mar 2008 18:09:03 -0700 From: "Eric Swartz - WA6HHQ, Elecraft" <[hidden email]> At long last we have the K3 Enhancements and Application Notes Page, and K3 enhancements parts kits order form, on-line. :-) See: http://www.elecraft.com/K3/k3_app_notes.htm and: http://www.elecraft.com/order_form_parts.htm#K3%20Parts There are .pdf documents for each item, along with the approximate date and s/n of any K3 enhancement phase in. 73, Eric WA6HHQ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Eric Swartz - WA6HHQ
According to the Application Notes Page my K3 #145 should have an ~8ms rise time. However, viewed on my analogue 'scope the rise time (0 - 100%) is definitely shorter and nearer to 5ms with a similar fall time though with a sharper falling transition edge.
The notes suggest the mod is necessary to enable a future menu selectable envelope adjustment but I don't want to reduce my rise time to a nominal 5ms if it already is around that figure anyway - presumably I will end up with an even steeper leading edge. Anyone else looked at keying waveforms in pre s/n 211 K3s...? Stewart Rolfe, GW0ETF
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In reply to this post by Eric Swartz - WA6HHQ
I didn't see any s/n listing in any of the docs?
-- Children aren't happy without something to ignore, And that's what parents were created for. -Ogden Nash (1902-1971) On 28 Mar 2008, at 01:09, Eric Swartz - WA6HHQ, Elecraft wrote: > At long last we have the K3 Enhancements and Application Notes Page, > and K3 enhancements parts kits order form, on-line. :-) > > See: http://www.elecraft.com/K3/k3_app_notes.htm > and: > http://www.elecraft.com/order_form_parts.htm#K3%20Parts > > There are .pdf documents for each item, along with the approximate > date and s/n of any K3 enhancement phase in. > > 73, Eric WA6HHQ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by GW0ETF
The production start date for this mod could be in error on the webpage. I know this issue has been known about well before S/N 211. My S/N is early 100's and it definitely needed the mod. Open your K3 (bottom panel closest to the front panel) and measure C222. If it's 0.1 uF, the mod has already been installed. Unfortunately the only way to tell, since SMD caps are unmarked, may be to use a capacitance meter (unless Elecraft can suggest a better method). I believe a meter will read the value correctly even with the cap in-circuit. 73, Bill |
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I believe G4AON (K3 S/N 80) was the first to discover the CW rise time issue. From his K3 review: "There were no high power peaks when transmitting on low power and the waveform of CW transmissions were smooth and clean when observed on an oscilloscope. The rise and fall times were originally fixed and fairly soft at approx 8 mS rise and 5 mS fall, not surprisingly there are no signs of key clicks. A later change to the value of capacitor C222 (to 100 nF) reduces the rise time to 5 mS. The time delay between the linear keying line going low and RF appearing from the antenna socket is approximately 10 mS, linears that are not able to switch in 10 mS would need to use the transmit inhibit feature, QSK CW would be impossible with such a linear. A later firmware upgrade is planned to offer variable time delays on the linear keying line, for example the Kenwood TS-480 offers 10 mS or 25 mS depending on QSK or semi-break in keying is used. The oscilloscope trace shown below was triggered by the linear keying Voltage going low and shows a single Morse "dit" at 20 words per minute, power output 10 Watts, this was taken after changing C222 to 100 nF." http://www.astromag.co.uk/k3/ (scroll down to CW waveform) 73, Bill |
Re: K3 Enhancements and Application Notes Page
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In reply to this post by M0XDF
S/Ns and shipping dates are shown on the K3 Enhancements and Application
Notes web Page. Please note that these s/ns and dates are not exact to the s/n and day as there can be a small day to day variance in s/n produced etc. 73, Eric _..._ David Ferrington, M0XDF wrote: > I didn't see any s/n listing in any of the docs? > -- Children aren't happy without something to ignore, And that's what > parents were created for. -Ogden Nash (1902-1971) > > > On 28 Mar 2008, at 01:09, Eric Swartz - WA6HHQ, Elecraft wrote: >> At long last we have the K3 Enhancements and Application Notes Page, >> and K3 enhancements parts kits order form, on-line. :-) >> >> See: http://www.elecraft.com/K3/k3_app_notes.htm >> and: >> http://www.elecraft.com/order_form_parts.htm#K3%20Parts >> >> There are .pdf documents for each item, along with the approximate >> date and s/n of any K3 enhancement phase in. >> >> 73, Eric WA6HHQ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 Enhancements and Application Notes Page
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In reply to this post by Eric Swartz - WA6HHQ
Eric
Can you comment on hardware mods and how that is going to be handled? My SN101 probably needs the keying mod mentioned earlier in this thread and I don't know what others. k4ia Craig "Buck" Fredericksburg, Virginia K3 #101 **************Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15&ncid=aolhom00030000000001) _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 Enhancements and Application Notes Page (CW risetime)
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In reply to this post by GW0ETF
My S/N 195 has a 1 microfarad installed and has what I would call an 8 mS
rise time. Don K7FJ ----- Original Message ----- From: "GW0ETF" <[hidden email]> To: <[hidden email]> Sent: Friday, March 28, 2008 6:48 AM Subject: Re: [Elecraft] K3 Enhancements and Application Notes Page (CW risetime) > > According to the Application Notes Page my K3 #145 should have an ~8ms > rise > time. However, viewed on my analogue 'scope the rise time (0 - 100%) is > definitely shorter and nearer to 5ms with a similar fall time though with > a > sharper falling transition edge. > > The notes suggest the mod is necessary to enable a future menu selectable > envelope adjustment but I don't want to reduce my rise time to a nominal > 5ms > if it already is around that figure anyway - presumably I will end up with > an even steeper leading edge. > > Anyone else looked at keying waveforms in pre s/n 211 K3s...? > > Stewart Rolfe, GW0ETF > > > Eric - WA6HHQ wrote: >> >> At long last we have the K3 Enhancements and Application Notes Page, and >> K3 enhancements parts kits order form, on-line. :-) >> >> See: http://www.elecraft.com/K3/k3_app_notes.htm >> and: >> http://www.elecraft.com/order_form_parts.htm#K3%20Parts >> >> There are .pdf documents for each item, along with the approximate date >> and s/n of any K3 enhancement phase in. >> >> 73, Eric WA6HHQ >> >> >> _______________________________________________ >> Elecraft mailing list >> Post to: [hidden email] >> You must be a subscriber to post to the list. >> Subscriber Info (Addr. Change, sub, unsub etc.): >> http://mailman.qth.net/mailman/listinfo/elecraft >> >> Help: http://mailman.qth.net/subscribers.htm >> Elecraft web page: http://www.elecraft.com >> >> > > -- > View this message in context: > http://www.nabble.com/K3-Enhancements-and-Application-Notes-Page-tp16343769p16349786.html > Sent from the Elecraft mailing list archive at Nabble.com. > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Eric Swartz - WA6HHQ
ok, ok :-)
a couple, of course I was looking at the KXV3 :-( I need them all anyway 73 de M0XDF, K3 #174 -- Study without desire spoils the memory, and it retains nothing that it takes in. -- Leonardo da Vinci On 28 Mar 2008, at 14:35, Bill Tippett wrote: > > > I didn't see any s/n listing in any of the docs? > > Maybe a new pair of glasses would help! :-) > > 73, Bill W4ZV > > <2c313191.jpg> > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Eric Swartz - WA6HHQ
yeah, I see that now - very sorry to everyone for not opening my eyes :(
-- A successful man is one who makes more money than a wife can spend. A successful woman is one who can find such a man. -Lana Turner, actress (1921-1995) On 28 Mar 2008, at 15:56, Eric Swartz - WA6HHQ Elecraft wrote: > S/Ns and shipping dates are shown on the K3 Enhancements and > Application Notes web Page. > > Please note that these s/ns and dates are not exact to the s/n and > day as there can be a small day to day variance in s/n produced etc. > David Ferrington, M0XDF wrote: >> I didn't see any s/n listing in any of the docs? _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Bill W4ZV
Bill, My K3 s/n145 did need the mod. After some encouraging words from G4AON I've just changed the cap and the difference in the waveform is substantial. Previously the leading edge was very gradual and the amplitude actually increased throughout the length of the element making it difficult to pick a 'full power' point with which to measure the rise time. The wave shape is now symmetrical and level with both leading and trailing edges timed at pretty much 5ms. As Dave G4AON has noted the keying delay has reduced slightly to about 8ms but my Acom 1000 in qsk doesn't mind that. 73, Stewart, GW0ETF |
Re: K3 Enhancements and Application Notes Page (CW rise time)
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In reply to this post by Bill W4ZV
On Fri, Mar 28, 2008 at 10:12 AM, Bill W4ZV <[hidden email]> wrote:
> > > Anyone else looked at keying waveforms in pre s/n 211 K3s...? > > > > The production start date for this mod could be in error on the webpage. I > know this issue has been known about well before S/N 211. My S/N is early > 100's and it definitely needed the mod. I thought it is meant to be read, any K3 _up to_ S/N 211 may need the modification. I take it that after that point in time a change was made. Or am I just reading things backwards? Similar to how a number of modifications were available/needed for early model K2s whereas a late model K2 had very few mods / re-work needed. -Michael _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Correct...units prior to ~211 will need it and afterwards will not. If yours is near 211 (+/-), you may need to check the capacitance of C222 using a capacitance meter. It should read ~0.1 uF (or ~100 pF) if the mod has been installed (if not it will read ~1 uF). I'm guessing on this, and hopefully Eric or Wayne should confirm, but I would expect that both the HAGC and keying mods were implemented in production at the same time, since the S/N transition is the same for both (i.e. ~211). If this is true, you can easily determine if your unit was modified by looking for a discrete 1.8k resistor installed between C196 and C197 as shown in the HAGC mod instructions. If that resistor is in place, it's a good bet that C222 has been replaced as well, but a capacitance meter will tell for sure. 73, Bill W4ZV |
K3 Enhancements and Application Notes Page (CW rise
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In reply to this post by michael taylor-3
My K3, Ser. No 308, does NOT have the HAGC mod. So the SN 211 guestimate
appears pretty far off. Phil - AD5X "Correct...units prior to ~211 will need it and afterwards will not. If yours is near 211 (+/-), you may need to check the capacitance of C222 using a capacitance meter. It should read ~0.1 uF (or ~100 pF) if the mod has been installed (if not it will read ~1 uF). I'm guessing on this, and hopefully Eric or Wayne should confirm, but I would expect that both the HAGC and keying mods were implemented in production at the same time, since the S/N transition is the same for both (i.e. ~211). If this is true, you can easily determine if your unit was modified by looking for a discrete 1.8k resistor installed between C196 and C197 as shown in the HAGC mod instructions. If that resistor is in place, it's a good bet that C222 has been replaced as well, but a capacitance meter will tell for sure. 73, Bill W4ZV" _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 Enhancements and Application Notes Page (CW rise
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Hi Phil:
Did you check to see if you have a Rev B RF Board? The App Note says that all Rev B RF Boards have the already have this incorporated... I'm guessing without the leaded resistor between C196 and C197. 73, Ken K3IU ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Phil & Debbie Salas wrote: > My K3, Ser. No 308, does NOT have the HAGC mod. So the SN 211 > guestimate appears pretty far off. > > Phil - AD5X > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 Enhancements and Application Notes Page (CW rise
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In reply to this post by Phil Salas
Same here. My Serial # 307, didn't have it.
73 Stewart G3RXQ On Sat, 29 Mar 2008 10:57:38 -0500, Phil & Debbie Salas wrote: > My K3, Ser. No 308, does NOT have the HAGC mod. So the SN 211 guestimate > appears pretty far off. > > Phil - AD5X > > "Correct...units prior to ~211 will need it and afterwards will not. If > yours is near 211 (+/-), you may need to check the capacitance of C222 using > a capacitance meter. It should read ~0.1 uF (or ~100 pF) if the mod has > been installed (if not it will read ~1 uF). > > I'm guessing on this, and hopefully Eric or Wayne should confirm, but I > would expect that both the HAGC and keying mods were implemented in > production at the same time, since the S/N transition is the same for both > (i.e. ~211). If this is true, you can easily determine if your unit was > modified by looking for a discrete 1.8k resistor installed between C196 and > C197 as shown in the HAGC mod instructions. If that resistor is in place, > it's a good bet that C222 has been replaced as well, but a capacitance meter > will tell for sure. 73, Bill W4ZV" > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
K3 Enhancements and Application Notes Page (CW rise
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In reply to this post by Phil Salas
I'll have to open it up again and check. My SN308 was shipped on 1/24/08,
which I think is early for the Rev B board. Maybe someone from Elecraft can tell us when the Rev B boards began shipping? Phil - AD5X "Hi Phil: Did you check to see if you have a Rev B RF Board? The App Note says that all Rev B RF Boards have the already have this incorporated... I'm guessing without the leaded resistor between C196 and C197. 73, Ken K3IU" _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Pictures of KRX3 posted yet?
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In reply to this post by Eric Swartz - WA6HHQ
Just curious if pictures of the new version of the KRX3 have been posted anywhere?
_______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 Enhancements and Application Notes Page (CW risetime)
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In reply to this post by Bill W4ZV
Bill W4ZV wrote:
> If yours is near 211 (+/-), you may need to check the capacitance of > C222 using a capacitance meter. It should read ~0.1 uF (or ~100 pF) Just to prevent any confusion... 0.1 uF is 100 nF, not 100 pF. Bill W5WVO, the Compulsive Copyeditor _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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