KAT2 - Bridge Null Adjustment problem
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I am having difficulty performing the Bridge Null Adjustment of C55 on page 16 of the manual and could use a little help, if you please.
I am unable to get the ATU CALn measurement of reflected power to be anything but ‘HI’ … in other words, no null. I have checked the SWR bridge components and solder joints; the toroid was wound by Mychael, not me, so I know it is not the culprit … When I go on to check the receive and transmit voltages on U4 pin 1 (page 17) I find 0 volts on receive, which is good, and 4.8 volts on transmit which ain’t too far off from 3-4 …. Should I push on, or am I heading down the path to oblivion (or, at least, the path of improper antenna tuner function)! ------------------------------------------------------------------------------- This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is proprietary, confidential, and exempt from disclosure under applicable law. Any unauthorized review, use, disclosure, or distribution is prohibited. If you have received this email in error please notify the sender by return email and delete the original message. Please note, the recipient should check this email and any attachments for the presence of viruses. The organization accepts no liability for any damage caused by any virus transmitted by this email. ============================================================================== _______________________________________________ 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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Well, my KAT2 saga continues.
I did indeed find some unsoldered pins on one of the relays, and corrected this. Now, however, I seem to have the opposite problem. When trying to perform the CALn procedure, instead of having too much reflected power, I now have no power (forward or reflected) at all; '000' shows all the time on the LCD display, no matter what I do to C55 does and no matter what the Power level is set to. The DC voltages on the REFL and FWD signals paths are zero now. I have checked and rechecked for solder bridges, cold joints and shorts/continuity on the RF cable and control cable, and am running out of ideas (and my sanity)! ------------------------------------------------------------------------------- This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is proprietary, confidential, and exempt from disclosure under applicable law. Any unauthorized review, use, disclosure, or distribution is prohibited. If you have received this email in error please notify the sender by return email and delete the original message. Please note, the recipient should check this email and any attachments for the presence of viruses. The organization accepts no liability for any damage caused by any virus transmitted by this email. ============================================================================== _______________________________________________ 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: KAT2 - Bridge Null Adjustment problem
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The first thing that occurs to me is that the single turn of wire through
the center of T1 may be missing. The second thing is that T1 itself may not be properly wound or properly soldered. Check that the proper color wire is inserted into the proper holes (the color of the wire in hole 2 should be opposite of the color in hole 3). Other than that, there is not much that would produce no voltage out of the wattmeter, but check the soldering and orientation of the diodes. 73, Don W3FPR > -----Original Message----- > > Well, my KAT2 saga continues. > > > > I did indeed find some unsoldered pins on one of the relays, and > corrected this. > > > > Now, however, I seem to have the opposite problem. When trying to > perform the CALn procedure, instead of having too much reflected power, > I now have no power (forward or reflected) at all; '000' shows all the > time on the LCD display, no matter what I do to C55 does and no matter > what the Power level is set to. The DC voltages on the REFL and FWD > signals paths are zero now. I have checked and rechecked for solder > bridges, cold joints and shorts/continuity on the RF cable and control > cable, and am running out of ideas (and my sanity)! > > No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.11.1/104 - Release Date: 9/16/2005 _______________________________________________ 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 wb2ssb
R6 is currently uninstalled ... I am still trying to do the CALn null
adjustment ... as I said, instead of having HI showing up continuously, I know have only '000' on the display. (I don't know if this is significant, but the manual says the display should look something like '075 ATU' but I only see '000', not '000 ATU' ... In any event, I have checked T1 3 times already, reheated the leads, made sure the green jumper cable across it is in place ... again checked continuity of the RF cable .... and of course checked for the 3rd time that the ground and hot leads weren't reversed ... Gonna pull it apart again and look at the soldering on the relays AGAIN ... this situation changed when I soldered a row of pins on one of the relays that I had missed .... I think I was better off when they ere unsoldered! At least I had SOME output! :-) -----Original Message----- From: k4zm [mailto:[hidden email]] Sent: Saturday, September 17, 2005 4:28 PM To: Sanger, Joseph Subject: Re: [Elecraft] KAT2 - Bridge Null Adjustment problem Have you installed R6 yet? Page 17 - 5th step is to install a 47 ohm 1/4 watt resistor in the KAT2. This is the info to the K2 microprocessor to set the power level out of the K2. 73 Jim K4ZM ------------------------------------------------------------------------------- This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is proprietary, confidential, and exempt from disclosure under applicable law. Any unauthorized review, use, disclosure, or distribution is prohibited. If you have received this email in error please notify the sender by return email and delete the original message. Please note, the recipient should check this email and any attachments for the presence of viruses. The organization accepts no liability for any damage caused by any virus transmitted by this email. ============================================================================== _______________________________________________ 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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