[Elecraft] Capacitors for K1-4 Filter Board
I just purchased the K1-4, serial #01951. Checking the capacitors for the filter board I have a problem identifying C9 marked with "1". I do have a small bright blue capacitor with .10 inch lead spacing with "1A" marked on one side, and it sure looks like "2.7C" on the other side. Should this be C9? Thanks for any help. Ken H> ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] K1-4 Frequency
Hi all, this is another question I have with the K1-4. When I transmit on my 756Pro, the K1-4 receives right on freq, but if I transmit on the K1-4 the 756Pro will show the received freq higher. i.e. The 756Pro has the CW filter set to 100hz so it is pretty narrow. transmit on 7040.0 on the K1-4, the 756Pro receives on 7040.75 Transmit on 10,130.0 on the K1-4, the 756Pro receives on 10129.20 Transmit on 14,040.0 with the K1-4, the 756Pro receives on 14,040.63 Transmit on 18,100.0 with the K1-4, the 756Pro receives on 18,100.75 And I do appreciate all the help provided. 73 de Ken H. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] K1 - Problem
Hi, with my K1-4; serial #1951 I have the following symptoms/problems. I sure will appreciate any help given. I have completed the assembly and did the alignments and tests. Everything seems to be working just fine except for the following - AND I have not been able to find where the C2A (120J) capacitor shown in the RF board parts list. Anyone able to tell me where that goes? Reference is made to this capacitor on page 27 at the bottom right where the C11 (1200J) capacitor is installed, but no location is given for C2 or C2A capacitor. 40 meter = 7 watts output 30 meters = 0.1 watt output 20 meters = 5 watts output 17 meters = 5 watts output The receive seems to be good on 40, 20, and 17 meter bands. 30 meters is very weak receive. With just this small amount of output on 30 mtrs, does this show the 18.100 crystal is working? Voltage checks at D9 Anode = 0 vdc (spec calls for 4.3-4.6) Voltage checks at D9 Cathode = 5.03 vdc (spec calls for 3.8-4.1) Voltage checks at D10 Anode = 5.65 vdc (spec calls for <0.2) Voltage checks at D10 Cathode = 5.03 vdc (spec calls for 3.8-4.1) Voltage checks at D11 Anode = 5.65 vdc (spec calls for <0.2) Voltage checks at D11 Cathode = 5.06 vdc (spec calls for 4.0-4.6) Voltage checks at D13 Anode = 0.0 vdc (spec calls for 0.4-0.7) Voltage checks at D13 Cathode = 5.65 vdc (spec calls for <0.2) I am amazed how far off the voltages are with the radio working as well as it is When I listen to the transmitted signal on the 756Pro, it sounds clean and clear. Sidetone sound good. All the menu options seem to work as they should. If it wasn't for the low output on 30 mtrs and the freq problem in the next e-mail, I would think the radio was ok. Thanks for any and all help, ken H> ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K1 - Problem
Thank you Jim - I'll also post this to the group as well just to keep them informed about where I'm at with testing. IF I can't get this thing aligned completely, I may have to resort to bothering you with it "next year" when I get back to Mobile. I did the following tests and re-checked the transmitter offset adjustment again. That didn't seem to change much of anything. As the two tones came together, there was kind of a "waver" in the sound. when I continued to move past that point, the waver would disappear, then appear again. I then moved the adjustment between those two points. Is that correct? > a problem with the 30 Meter HetrodyeOscillator Crystal. It sounds like it > is not oscillating. If you have a general coverage receiver you can tune to > the freq of the crystal and see you can hear it. I tuned my 756Pro with CW filter set to 100hz with a coax jumper connected to the antenna SO-239. With the K1-4 just turned on, no antenna connected and in receive mode with other end of coax held close to J6, pin #4 I get: 40 meter band = 15,003.96Mhz with a nice tone (15.00 Crystal?) 30 meter band = 18,097.78 Mhz with a nice tone (18.100 Crystal?) 20 meter band = 21.996.83Mhz with a nice tone (22.00 Crystal?) 40 meter band = 26,046.64Mhz with a nice tone (26.05 Crystal?) The 30 meter signal was as strong as the other bands, but I am surprised at the offset from the stated filter freq. OR is this normal and why we must do the Freq offset calibration for each band? Now when I transmit with the K1-4 into a dummy load (an old Health Cantenna) and tune in the signal on the 756Pro, I get the following: K1 transmits at 7040.0 = 756Pro receives at 7040.67 (K1 receives same freq 756Pro transmits) K1 transmits at 10,130.0 = 756Pro receives at 10,130.00 (but K1 receives 600 hz off.) K1 transmits at 14,030.0 = 756Pro receives at 14,030.63 (K1 receives same freq 756Pro transmits) K1 transmits at 18,090.0 = 756Pro receives at 18,090.62 (K1 receives same freq 756Pro transmits) On 30 meters the K1-4 only transmits in the milliwatt range too small to see on my wattmeter. The K1-4 seems to receive pretty good on 30 meters when connected to outside antenna. A weak signal on the 756Pro is still received on the K1-4, but a bit weaker. It the signal is received on the 756Pro at 10,30.00, the K1-4 will receive it about 10,130.6. It really seems like the K1-4 is receiving ok on 30 meters, just no power output. I also re-melted solder on all the L1-L2-L3 inductor wires and the capacitors around it. I counted the number of turns on each of the inductors to be sure it was correct and checked the spacing around the torrid core. Thank you for the help, Ken ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K1-4 Frequency
Not a problem Sandy. I will also sent this to the group. The problem seemed to be in the calibrating the transmit offset was the reason the transmit was off. The receive calibration about was right on. I took the K1 over to Jim - K4ZM - house today and we (he) used his test equip to get the alignment right on. We found an intermittent 18.100 crystal that was causing the problem on 30 meters. Replaced it, and it's now working good on 30 meters. When I did the test below the crystal was working, but later it wouldn't work. Once when Jim was testing it, the crystal worked, then it wouldn't work so he replaced it. Jim checked the receiver sensitivity at .1 microvolt and you could still hear the test signal good enough to copy. I was impressed at how good the receiver is on the K1. Thanks to all for the help. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] resitance vs impedence
While setting up a dipole antenna tonight a question come up while discussing the tuning with myself: Which is the "most effective" antenna - understanding it will be matched with a antenna tuner, either the internal autotuner or an external manual tuner - a dipole type antenna with a resistance of R=6 ohms and impedance of X=16, or the same dipole type antenna with R=48 and X=146? Both of these settings have the same SWR=6.5 I guess that same question would apply to a short vertical, or end fed zepp type antenna. Anyone care to comment on this? Thanks, 73 de Ken K9FV K1 #1951 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
