One additional note. An additional note. When I tune on 160m, then tune on 80m, I get a Hi Cur on 80 m. If I turn the tune off on 80 then retune on 80 I get no Hi Cur. I do not get a hi Cur on 160 after tuning on 80m.
Don ----- Original Message ----- From: "Don Clark" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[email protected]> Sent: Friday, August 26, 2005 2:29 PM Subject: Re: [Elecraft] 160 meter low transmit > Don, > > I pulled C13, 14 last night and both were 1300 pf on my meter. > > I used the RF probe I contructed from the K2 Elecraft kit parts in 2000. > > Voltage > Component 80m 160m > > D6 40.7 mv 57.2 mv > D7 40.9 mv 57.8 mv > W6 21.6 mv 13.4 mv > Q5 298 mv 0 > Q6 1.8 volts .9 volts > > Don - KA6AKH > > > ----- Original Message ----- > From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]> > To: "Don Clark" <[EMAIL PROTECTED]>; <[email protected]> > Sent: Friday, August 26, 2005 7:42 AM > Subject: RE: [Elecraft] 160 meter low transmit > > > > Don, > > > > With that information, I would suspect the bandpass filter (even if it > > receives 160 meters fine) - re-check C13 and C14 for the correct value of > > 1200 pf. > > > > If that does not correct things, use an RF probe or 'scope and compare RF > > Voltages between 160 meters and 80 meters with the power set at about 5 > > watts. Check at the following points (you can stop at the first one that > is > > substantially lower on 160) - cathode of D6 or D7 first - then at jumper > > W6 - then the collector (case) of Q5 - next the collector (tab) of Q6 - > then > > the collector of Q7 and collector of Q8. > > > > Let us know where the 160 meter RF is being lost (RF Voltage > substantiallly > > less than that on 80 meters) and we can likely home in on the problem > area. > > > > 73, > > Don W3FPR > > > > > -----Original Message----- > > > > > > 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 > > > > > -- > > 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
