K2 - hang up problem
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Before I tear into the K2 to find out what happened today I figured I would ask on here in case someone has seen this problem before. It receives fine on all bands. When I transmit (does not matter what power level or what band) it hangs up. If I keep it on the transmit mode power out is fine. If I let it go back to the receive mode the receive signals are very, very weak. If I talk into the mike, there is no power out and I have side tone in the headset so I can listen to my transmit audio. To correct this problem I need to change bands or shut off then on the radio. Anyone hear of this problem before? Tnx for any ideas before I pull out the schematics and take off the covers. 73, N2TK, Tony _______________________________________________ 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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On Fri 1 Feb 2008 at 19:14:13 EST Tony Kazmakites (N2TK) wrote ...
Before I tear into the K2 to find out what happened today I figured I would ask on here in case someone has seen this problem before. It receives fine on all bands. When I transmit (does not matter what power level or what band) it hangs up. If I keep it on the transmit mode power out is fine. If I let it go back to the receive mode the receive signals are very, very weak. If I talk into the mike, there is no power out and I have side tone in the headset so I can listen to my transmit audio. To correct this problem I need to change bands or shut off then on the radio. Anyone hear of this problem before? Tnx for any ideas before I pull out the schematics and take off the covers. -- Tony, A couple of questions ... 1) What is your supply voltage? Under no load? Under load? 2) What is your K2 life story, i.e. S/N, how long had it been operating just fine before this problem surfaced? 73, Gary KI4GGX _______________________________________________ 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 N2TK
Tony,
I have never seen a problem like that before, but I would suggest starting with the 8R and 8T voltage rails on the control board. If they are not switching properly between transmit and receive it could conceivably create a problem like you describe. OTOH, hearing your SSB signal in the headphones is not normal for the K2, and only normally happens when the menu SSBA parameter is set to BAL. If the menu is being changed inadvertently during a transmit to receive transition, suspect RF is somehow getting into the K2 (RF-IN-THE-SHACK problem??). Alternately, control board U6 may not be properly seated in its socket - try re-seating it. Keep us posted on what you find. 73, Don W3FPR N2TK wrote: > Before I tear into the K2 to find out what happened today I figured I would > ask on here in case someone has seen this problem before. > > It receives fine on all bands. When I transmit (does not matter what power > level or what band) it hangs up. If I keep it on the transmit mode power out > is fine. If I let it go back to the receive mode the receive signals are > very, very weak. If I talk into the mike, there is no power out and I have > side tone in the headset so I can listen to my transmit audio. > To correct this problem I need to change bands or shut off then on the > radio. > > Anyone hear of this problem before? > > Tnx for any ideas before I pull out the schematics and take off the covers. > > 73, > N2TK, Tony > _______________________________________________ > 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 Gary Hvizdak
Hi Gary, Supply voltage is 13.0V as it has been since I put together the K2. At 1W out the voltage is at 13.0. At 100W out the voltage is 12.8V. The rig hangs up at all power levels. Serial #3481. It has been working fine for over 4 years. N2TK, Tony -----Original Message----- From: Gary Hvizdak [mailto:[hidden email]] Sent: Friday, February 01, 2008 8:05 PM To: [hidden email] Cc: [hidden email] Subject: RE: [Elecraft] K2 - hang up problem On Fri 1 Feb 2008 at 19:14:13 EST Tony Kazmakites (N2TK) wrote ... Before I tear into the K2 to find out what happened today I figured I would ask on here in case someone has seen this problem before. It receives fine on all bands. When I transmit (does not matter what power level or what band) it hangs up. If I keep it on the transmit mode power out is fine. If I let it go back to the receive mode the receive signals are very, very weak. If I talk into the mike, there is no power out and I have side tone in the headset so I can listen to my transmit audio. To correct this problem I need to change bands or shut off then on the radio. Anyone hear of this problem before? Tnx for any ideas before I pull out the schematics and take off the covers. -- Tony, A couple of questions ... 1) What is your supply voltage? Under no load? Under load? 2) What is your K2 life story, i.e. S/N, how long had it been operating just fine before this problem surfaced? 73, Gary KI4GGX _______________________________________________ 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 N2TK
On Fri 1 Feb 2008 at 22:24:43 EST Tony Kazmakites (N2TK) wrote ...
Supply voltage is 13.0V as it has been since I put together the K2. At 1W out the voltage is at 13.0. At 100W out the voltage is 12.8V. The rig hangs up at all power levels. Serial #3481. It has been working fine for over 4 years. -- Tony, More questions ... 1) Aside from the KPA100 and KSB2, what other options do you have? Is your KPA100 remoted? 2) Does this behavior also occur in CW mode or just SSB? 3) Have you discovered any additional symptoms or any other ways to clear the problem, beyond what you originally mentioned? 4) Very briefly describe your antenna system including tuners. Has anything about your antenna system changed recently? (Given your problem description this probably doesn't have anything to do with it.) 5) Do you have a cat? (They have been known to pee on equipment and to chew on cables.) 73, Gary KI4GGX _______________________________________________ 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 N2TK
Fixing it by changing bands and weak reception afterwards is the key to this. No SSB is also a clue. I would say you have a problem in the switching between TX and RX. It is not the RF side of things (e.g. switching diodes) as it would not reset, it must be in the control signals. Somehow the +TX and +RX control lines are not doing what they should be. The fact that is does still TX OK probably means the +TX line is fine. I would concentrate on the +RX line. Also look for any bad contacts or short circuits. This could also be a software glitch, and a full reset to factory defaults may clear it up.
Mike
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Re: K2 - hang up problem
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In reply to this post by N2TK
A problem that appeared in my K2/100 #3255 some years after it was built,
and again about a year later, might or might not be relevant. My K2 went on 'strike' while in use, and none of the front panel controls except the power on/ off switch had any effect. The display showed the frequency in use when the K2 acted up, and tuning did not change it period. Turning power off and back on did not solve the problem, and the displayed frequency did not change. In both cases the problem was caused by the socket of U6 the Control Board MCU, pulling U6 and reseating it cured the problem. After the second episode I replaced U6's socket with a 'Turned Pin' type which I should have used when building the rig. The type of socket supplied with the kit can often give rise to 'corrosion' problems, which result in poor contact between IC pins and the IC socket. 73, Geoff GM4ESD "N2TK" <[hidden email]> wrote: > > Before I tear into the K2 to find out what happened today I figured I > would > ask on here in case someone has seen this problem before. > > It receives fine on all bands. When I transmit (does not matter what power > level or what band) it hangs up. If I keep it on the transmit mode power > out > is fine. If I let it go back to the receive mode the receive signals are > very, very weak. If I talk into the mike, there is no power out and I have > side tone in the headset so I can listen to my transmit audio. > To correct this problem I need to change bands or shut off then on the > radio. > > Anyone hear of this problem before? > > Tnx for any ideas before I pull out the schematics and take off the > covers. > > 73, > N2TK, Tony _______________________________________________ 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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I agree with Geoff about turned pin sockets, they are worth the money, but
they require a lot more insertion force. Ensure all your pins are straight and exactly aligned with the socket before re-inserting or there is a distinct danger of folding a pin up under itself and this is sometimes difficult to spot. I've fitted several thousand, I have the scars! 73 David G3UNA > In both cases the problem was caused by the socket of U6 the Control Board > MCU, pulling U6 and reseating it cured the problem. After the second > episode I replaced U6's socket with a 'Turned Pin' type which I should > have used when building the rig. The type of socket supplied with the kit > can often give rise to 'corrosion' problems, which result in poor contact > between IC pins and the IC socket. > > 73, > Geoff > GM4ESD > > 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 Gary Hvizdak
Hi Gary,
Comments below. Also, per W3FPR's suggestions I will reseat the U6 and check 8R and 8T. Tnx, N2TK, Tony -----Original Message----- From: Gary Hvizdak [mailto:[hidden email]] Sent: Saturday, February 02, 2008 2:15 AM To: [hidden email] Cc: [hidden email] Subject: RE: [Elecraft] K2 - hang up problem On Fri 1 Feb 2008 at 22:24:43 EST Tony Kazmakites (N2TK) wrote ... Supply voltage is 13.0V as it has been since I put together the K2. At 1W out the voltage is at 13.0. At 100W out the voltage is 12.8V. The rig hangs up at all power levels. Serial #3481. It has been working fine for over 4 years. -- Tony, More questions ... 1) Aside from the KPA100 and KSB2, what other options do you have? Is your KPA100 remoted? (I also have the K160RX, KNB2,KDSP2. The KPA100 is built in) 2) Does this behavior also occur in CW mode or just SSB? (Just SSB. CW is fine. I don't need a mike to cause the problem. If I key it while in the SSB mode it happens) 3) Have you discovered any additional symptoms or any other ways to clear the problem, beyond what you originally mentioned? (No additional symptoms that I can find) 4) Very briefly describe your antenna system including tuners. Has anything about your antenna system changed recently? (Given your problem description this probably doesn't have anything to do with it.) (No tuners. No antenna changes. This problem happens while on any band, any antenna including a dummy load and any power level from the lowest to 100W) 5) Do you have a cat? (They have been known to pee on equipment and to chew on cables.) (Nope, no animals) 73, Gary KI4GGX _______________________________________________ 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 AD6XY
Hi Mike,
For clarification, when this happens there is no longer any RF output. And it only happens when I speak into the mike or key the rig while in SSB mode. It does not happen if I am in CW mode. Tnx for the suggestions. I will post what I find that corrects the problem once I get it fixed. 73, N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of AD6XY - Mike Sent: Saturday, February 02, 2008 4:05 AM To: [hidden email] Subject: Re: [Elecraft] K2 - hang up problem Fixing it by changing bands and weak reception afterwards is the key to this. No SSB is also a clue. I would say you have a problem in the switching between TX and RX. It is not the RF side of things (e.g. switching diodes) as it would not reset, it must be in the control signals. Somehow the +TX and +RX control lines are not doing what they should be. The fact that is does still TX OK probably means the +TX line is fine. I would concentrate on the +RX line. Also look for any bad contacts or short circuits. This could also be a software glitch, and a full reset to factory defaults may clear it up. Mike N2TK, Tony wrote: > > > Before I tear into the K2 to find out what happened today I figured I > would > ask on here in case someone has seen this problem before. > > It receives fine on all bands. When I transmit (does not matter what power > level or what band) it hangs up. If I keep it on the transmit mode power > out > is fine. If I let it go back to the receive mode the receive signals are > very, very weak. If I talk into the mike, there is no power out and I have > side tone in the headset so I can listen to my transmit audio. > To correct this problem I need to change bands or shut off then on the > radio. > > Anyone hear of this problem before? > > Tnx for any ideas before I pull out the schematics and take off the > covers. > > 73, > N2TK, Tony _______________________________________________ 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 Geoffrey Mackenzie-Kennedy
Tnx Geoff for the input. W3FPR also suggested reseating U6. I am going to
try that first. 73, N2TK, Tony -----Original Message----- From: Geoffrey Mackenzie-Kennedy [mailto:[hidden email]] Sent: Saturday, February 02, 2008 4:41 AM To: N2TK Cc: Elecraft Discussion List Subject: Re: [Elecraft] K2 - hang up problem A problem that appeared in my K2/100 #3255 some years after it was built, and again about a year later, might or might not be relevant. My K2 went on 'strike' while in use, and none of the front panel controls except the power on/ off switch had any effect. The display showed the frequency in use when the K2 acted up, and tuning did not change it period. Turning power off and back on did not solve the problem, and the displayed frequency did not change. In both cases the problem was caused by the socket of U6 the Control Board MCU, pulling U6 and reseating it cured the problem. After the second episode I replaced U6's socket with a 'Turned Pin' type which I should have used when building the rig. The type of socket supplied with the kit can often give rise to 'corrosion' problems, which result in poor contact between IC pins and the IC socket. 73, Geoff GM4ESD "N2TK" <[hidden email]> wrote: > > Before I tear into the K2 to find out what happened today I figured I > would > ask on here in case someone has seen this problem before. > > It receives fine on all bands. When I transmit (does not matter what power > level or what band) it hangs up. If I keep it on the transmit mode power > out > is fine. If I let it go back to the receive mode the receive signals are > very, very weak. If I talk into the mike, there is no power out and I have > side tone in the headset so I can listen to my transmit audio. > To correct this problem I need to change bands or shut off then on the > radio. > > Anyone hear of this problem before? > > Tnx for any ideas before I pull out the schematics and take off the > covers. > > 73, > N2TK, Tony _______________________________________________ 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 AD6XY
Doing a Master Reset is not a step to be taken lightly. It will wipe
out all your menu settings including your CAL PLL and CAL FIL settings. If you feel you need to do a Master Reset, write down all your menu settings beforehand so you can restore your K2 after the reset. Don't forget that there is a secondary menu too (Tap DISPLAY). 73, Don W3FPR AD6XY - Mike wrote: > ,,,snip... > This could > also be a software glitch, and a full reset to factory defaults may clear it > up. > > _______________________________________________ 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 N2TK
Since this occurs only in SSB, the problem is on your KSB2 board.
1st try receiving with the SSB filter set to something other than the OP1 filter. If my current guess is correct, the KSB2 firmware is not switching the filter properly - and if that guess is correct, it will receive when the base K2 filter is selected in SSB mode. If all that checks out, it does not fix it, but does indicate where to look. Try reseating the firmware chip on the KSB2 board, and if that does not help we can begin looking at various voltages on the KSB2. The signals that switch the filter are RXS, TXS, TXC and RXC. 73, Don W3FPR N2TK wrote: > 2) Does this behavior also occur in CW mode or just SSB? > (Just SSB. CW is fine. I don't need a mike to cause the problem. If I key it > while in the SSB mode it happens) > > _______________________________________________ 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 N2TK
That narrows down the fault to the SSB module. Check it has not come loose. Also, check the filter settings have not become corrupted in the firmware.
Mike
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In reply to this post by N2TK
Well, I got my K2 working again. Don't understand why, but it is working
fine. My K2 sits on a XV50. I had unplugged the 12V to the XV50 to use the 12V line for the K3. It turns out if I unplug the 12V line to the XV50 I also need to disconnect the RS-232 line between the K2 and XV50, even though the XV50 is not ON. Then the K2 works fine on SSB (it always worked fine on CW). If the 12V power is plugged into the XV50 the RS232 line does not matter whether it is plugged into either the K2 or XV50 or both. But if the 12V power is removed from the XV50 the RS232 must be removed so the K2 works on SSB. Maybe over a beer I need to look at the schematics to see what this is all about. As always, ideas are welcome. Tnx for all the suggestions. Amazing how much help was offered. How about those Giants! 73, N2TK, Tony _____ From: Don Wilhelm [mailto:[hidden email]] Sent: Saturday, February 02, 2008 5:50 PM To: PA3HGC Cc: N2TK Subject: Re: [Elecraft] K2 - hang up problem Wow, two with the same problem at the same time - that is unusual. You guys will have to take some measurements to guide me in the right direction - right now it seems like the problem is on the KSB2 board, but we need to confirm or deny that. Open the K2 top cover - if a KPA100, lay it on a box to the right of the K2, but leave it connected. Receive with the OP1 filter for now. Then try to create the problem - when it occurs, it is time to take some measurements. Is RXS (U1 pin 21) high (5 to 6 volts)? It should be. Are TXS (U1 pin 15), TXC (U1 pin12), and RXC (U1 pin 22) all low (near zero volts). They should be. If those signals are in the correct state for SSB (or RTTY) receive with the OP1 filter, then the firmware chip on the KSB2 board is doing what it is supposed to. If not, then there is some firmware fault or some signals are not getting from the K2 to the KSB2 board. If the signals are correct and the failure persists, then the task is to follow those signals into the diode switches for the filter and try to find what is bad. It could be an unsoldered or poorly soldered connection. You may want to reflow the solder on all the diodes near the filter and the R-paks too. 73, Don W3FPR PA3HGC wrote: Don, Tony, Get an error message when posting to the Elecraft reflector ("Your IP is in nl, rejected based on geographical location"), so I try to approach you directly. Since last week I have the same problem with my K2 # 703 on all bands, i.e. receive and transmit in CW is perfect, receive in SSB and data modes is okay, only if I push the MH2's PTT key in LSB, USB or data mode and let the K2 go back to receive, the receive signals are much weaker than before (typically from S9 before keying the PTT to S1 afterwards). I can only get back to normal reception by switching bands or by switching the K2 off/on. My control board firmware is 2.03d, and the KSB2 firmware is 1.07. I have already resoldered the sockets of the firmware chips on the control board and the KSB2 adapter and reseated U6 and U1, but the problem persists with both the 10W K2 and the KPA100/KAT100-2 (in EC2 enclosure) attached. Thanks and 73, Gunter PA3HGC W3FPR wrote: Try reseating the firmware chip on the KSB2 board, and if that does not help we can begin looking at various voltages on the KSB2. The signals that switch the filter are RXS, TXS, TXC and RXC. 73, Don W3FPR _______________________________________________ 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 N2TK
Hi Tony,
My K2 is working fine as well. I measured the KSB2 U1 voltages as described by Don W3FPR and they appeared to be correct. Apparently, the problem was caused by my K20 CW keyboard, cf. http://k1el.tripod.com/k20info.html With the key plug of the K20 CW keyboard plugged into the key jack of the K2, SSB receive signals decreased after I pushed the MH2 PTT button. After unplugging the K20 keyboard from the K2 key jack, SSB receive signals were back to normal signal strength. Next time I want to do some SSB or PSK31 I have to remember that the CW keyboard needs to be unplugged from the K2. Thanks to you, Don and everyone else for the great support. vy 73, Gunter PA3HGC "N2TK" <[hidden email]> wrote: > Hi Gunter, > I do not know if this helped you or not. I did not take off the > covers of my K2 since it seems to be working fine. If I convert my > XV50 to a XV144 I will check out the problem. > > Good luck with your problem. > > 73, > N2TK, Tony > > _____ > > From: N2TK [mailto:[hidden email]] > Sent: Monday, February 04, 2008 5:05 PM > To: '[hidden email]'; 'PA3HGC' > Cc: 'Elecraft Discussion List' > Subject: RE: [Elecraft] K2 - hang up problem > > > Well, I got my K2 working again. Don't understand why, but it is > working fine. > > My K2 sits on a XV50. I had unplugged the 12V to the XV50 to use the > 12V line for the K3. It turns out if I unplug the 12V line to the > XV50 I also need to disconnect the RS-232 line between the K2 and > XV50, even though the XV50 is not ON. Then the K2 works fine on SSB > (it always worked fine on CW). > > > If the 12V power is plugged into the XV50 the RS232 line does not > matter whether it is plugged into either the K2 or XV50 or both. But > if the 12V power is removed from the XV50 the RS232 must be removed > so the K2 works on SSB. > > Maybe over a beer I need to look at the schematics to see what this > is all about. As always, ideas are welcome. > > Tnx for all the suggestions. Amazing how much help was offered. > > How about those Giants! > > 73, > N2TK, Tony > > _____ > > From: Don Wilhelm [mailto:[hidden email]] > Sent: Saturday, February 02, 2008 5:50 PM > To: PA3HGC > Cc: N2TK > Subject: Re: [Elecraft] K2 - hang up problem > > > Wow, two with the same problem at the same time - that is unusual. > You guys will have to take some measurements to guide me in the right > direction - right now it seems like the problem is on the KSB2 board, > but we need to confirm or deny that. > > Open the K2 top cover - if a KPA100, lay it on a box to the right of > the K2, but leave it connected. > Receive with the OP1 filter for now. > Then try to create the problem - when it occurs, it is time to take > some measurements. > Is RXS (U1 pin 21) high (5 to 6 volts)? It should be. > Are TXS (U1 pin 15), TXC (U1 pin12), and RXC (U1 pin 22) all low > (near zero volts). They should be. > If those signals are in the correct state for SSB (or RTTY) receive > with the OP1 filter, then the firmware chip on the KSB2 board is > doing what it is supposed to. If not, then there is some firmware > fault or some signals are not getting from the K2 to the KSB2 board. > > If the signals are correct and the failure persists, then the task is > to follow those signals into the diode switches for the filter and > try to find what is bad. It could be an unsoldered or poorly > soldered connection. You may want to reflow the solder on all the > diodes near the filter and the R-paks too. > > 73, > Don W3FPR > > PA3HGC wrote: > > Don, Tony, > > > > Get an error message when posting to the Elecraft reflector ("Your IP > is > > in nl, rejected based on geographical location"), so I try to approach > > you directly. > > > > Since last week I have the same problem with my K2 # 703 on all bands, > > i.e. receive and transmit in CW is perfect, receive in SSB and data > > modes is okay, only if I push the MH2's PTT key in LSB, USB or data > > mode and let the K2 go back to receive, the receive signals are much > > weaker than before (typically from S9 before keying the PTT to S1 > > afterwards). I can only get back to normal reception by switching > bands > > or by switching the K2 off/on. > > > > My control board firmware is 2.03d, and the KSB2 firmware is 1.07. > > I have already resoldered the sockets of the firmware chips on the > > control board and the KSB2 adapter and reseated U6 and U1, but the > > problem persists with both the 10W K2 and the KPA100/KAT100-2 (in > > EC2 enclosure) attached. > > > > Thanks and 73, > > Gunter PA3HGC > > > > > > W3FPR wrote: > > > > > > Try reseating the firmware chip on the KSB2 board, and if > > that does not help we can begin looking at various voltages on the > > KSB2. The signals that switch the filter are RXS, TXS, TXC and RXC. > > > > 73, > > Don W3FPR > > > > > > > > > > > > > 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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