My K2 is serial 1683. I built it in 2000. With my initial kit, I added the SSB capability and the 160 capability; however, since I didn't have a 160 antenna then, I didn't complete the 160 alignment. I built the KPA100 over the weekend and before closing up the rig, I decided to align 160. When applying the 2 watts via the power dial and adjusting L3 and L4, I can get no more than 1.3 to 1.4 watts out. I do receive 160 signals, and well at that. I compared my K2 to my FT-1000D and the K2 signal is received more strongly. I first reheated all the solder points including those mods that were done to the RF board for the 160 capability and the pin connectors, but no increase in power. I demounted the toroids on the module, retinned them and put them back, but still no increase in power. I tested the toroids for continutity on the tinned elements before remounting them, and they tested fine.
I measure 1.3 to 3 volts at R30 from 1800 to 2000. I connected a dummy load in front of the LPF and get the 1.2 watts there. Adjusting the power knob doesn't change the output at all. I took apart the LPF and tested each Cap and values are fine. L5 is the correct value. I pulled and test C75, C13, and C14, all ok. All the Caps in the pre-driver, driver and power amp are all the correct values. The only one I couldn't check is the one between the 2 power transistors on the bottom of the board. The resistance of my relay coils meets the specifications. I checked the T4 as noted in the notes on 160 issues on the Elecraft website, and mine is to spec with the 3 windings for points 3 and 4. My kit didn't have the 39 pf cap for one near U5. It has a 68 pf. I am outputting the K2 to a dummy load during my transmit tests. My power supply is outputting 13.8 volts. Don - KA6AKH ----- Original Message ----- From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]> To: "Don Clark" <[EMAIL PROTECTED]>; <[email protected]> Sent: Thursday, August 25, 2005 11:43 PM Subject: RE: [Elecraft] 160 meter low transmit > Don, > > It would appear that you may have something wrong in the 160 meter low pass > filter. Count the turns on the toroids, and check the capacitors for the > correct values. > > You are measuring the power output with a good 50 ohm dummy load, are you > not? If you are attempting to feed an antenna, the power output may be > real, but the problem is the feedpoint impedance of the antenna and not the > K2. > > Please povide ua with more information of what does and does not work, if we > are to offer more specific assistance. > > 73, > Don W3FPR > > > -----Original Message----- > > > > I built and installed the 160 meter module in 2000, but didn't > > align 160 meters since I didn't have an antenna at the time. I > > have recently completed my KPA100 and before closing up the rig, > > I decided to align 160. I receive signals on 160, but can't get > > more than 1.4 watts out, even when setting the power to 10 watts. > > I have resoldered all the components on the module board and the > > RF board. I believe that my toroids are connected ok. I have > > full output on 80 meters. > > > > Don - KA6AKH > > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.344 / Virus Database: 267.10.15/81 - Release Date: 8/24/2005 > _______________________________________________ Elecraft mailing list Post to: [email protected] 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
