K2 with external amplifer
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Hi Mike,
I have used my K2 with and SB1000 Heathkit amp (3-500 single) with good results, about 120 watts out on SSB and have had good reports. I have also used it with an Ameritron AL811 (3 811As) and this gives about 135 watts out with 15 watts drive, again with good reports. This has been on 75 meters where I check in to local nests. K0ARO Kurt _______________________________________________ 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 |
External RF Amp T-R relay driver for the BASIC K2...
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Hi Fellas:
At 07:51 AM 6/19/2005, walter renner wrote: >I have used my K2 with and SB1000 Heathkit amp (3-500 single) with good >results, about 120 watts out on SSB and have had good reports. I have >also used it with an Ameritron AL811 (3 811As) and this gives about 135 >watts out with 15 watts drive, again with good reports. This has been on >75 meters where I check in to local nests. >K0ARO >Kurt For what it may be worth... Several YEARS ago, Elecraft posted to their web site that I was working on a PC board adapter for the BASIC K2 (e.g. 15W, no K60XV installed) to add the ability for it to key an external T-R relay such as those in QRP RF Amplifiers. Well, I think a PC board design was posted somewhere, but it never breathed the light of day as far as ever going into production. Additionally, another reflector member had a small run of T-R PC boards run off and they found their way to Elecraft for sale. Once those boards (and associated parts) went out the Elecraft door, they (Elecraft) continued selling 'kits' of parts only (no PC board) with which you could wire your own external T-R relay driver, but no PC board was available as far as I know. Recently, I have redesigned the PC board for my external T-R relay driver. I've sent out three Field Test (prototype) boards three builders. Tow of the boards are still awaiting the builders to complete their RF amplifiers, BUT the third board HAS been installed and is merrily keying an Alpha amplifier... I don't recall the specific Alpha model however. The PC board design uses two resistors, one 2N7000 MOSFET in the pre-driver, and either one 2N7000 MOSFET (60VDC and 150mA keying current) or a heavier-duty HexFET (200VDC and 5A keying current) at the output. You can choose which output device to use. I will place the documentation for this PC board design on my web site at: www.n0ss.net The file will be in (1.4MB) PDF format and will be located in the section entitled "K2 RELATED FILES", but you can use the QuikLinks at (almost) the top of the page go directly to that section by clicking on the "K2-SPECIFIC FILES" link. By the way, the pix on the docs show the heavy-duty HexFET model of the adapter. Parts for this project ARE already available (I think) available at Elecraft, and they can also be ordered from Mouser (both Elecraft and Mouser part #'s are included in my docs). And I'm hoping that Elecraft will decide to have some of these boards made and include them as part of the 'kit' of parts they currently offer. I sent a design to Eric at Elecraft on Friday, but I used a drafting program I'm not familiar with (ExpressPCB), so I may have botched the design enough that I'll have to re-do it before they can use it (IF they decide to use it). In the meantime, if there's enough interest, I'll consider making some PC boards up (it's a 'kitchen sink operation' here, so they're not quite as 'pretty' as those commercially made, but they do look quite nice and work just as well). Price of the PC boards will probably by $6 ppd to your (US) doorstep with another $1 for DX orders. Please contact me directly if you are the least bit interested... I do NOT have any boards made at present, and am hoping that Elecraft will pick them up BEFORE I have to drag out the light box, developer and etchant... <G> Just thought someone might be interested. ONE MORE ITEM... If you use this device you WILL have to have one of the more current PIC firmware versions.. once which allows you to set the MENU item "T-R" to "8r hold" using the [DISPLAY] button once you are in the T-R edit mode. I don't recall what firmware revision first offered this feature, but it is a requirement if you wish to use the K2's 8R line to key an external T-R device. 73, Tom Hammond N0SS _______________________________________________ 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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Any one heard any more regards the 70cms K2 tvtr?? rgds Simon GM4PLM/DL4PLM _______________________________________________ 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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All,
I am using the K2 only as a tvtr driver for VHF, does any one else have some major birdies on the 10m band? I am trying to use the K2 as a Dx machine for contests and weak sig work but this sometimes makes life awkward is there any screening or anything in particular that causes them! I also noticed occasionally jumpy tuning in the 10 m section too any suggestions to fine tune these out? rgds Simon GM4PLM/DL4PLM _______________________________________________ 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 missed some mails from the reflector some time ago so excuse the BW!
I saw some mention of a KW amp from Elecraft? is this correct?? Any chance it MIGHT include 6m guys???? PLEASE!!!!!!!! hahahah! rgds Simon DL4PLM/GM4PLM _______________________________________________ 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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Simon Lewis wrote:
> Any chance it MIGHT include 6m guys???? PLEASE!!!!!!!! There is a chance...just a chance. An Elecraft employee (heheheh) told me that if it's possible, they would include it. It might need to be at reduced power compared to the other bands, since the gain of the transistors is less at this frequency. I'm afraid we'll have to Stay Tuned to see. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ 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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