[Elecraft] Re: Elecraft K2 TR adapter

[Bill Allen]

The kit that Tom has provided works very well.  I used one to do the TR switching from my K2 to a Tokyo-HyPower HL200BDX amp.   I have used it on another amp as well.

73,
Bill Allen  WA5PB

-----Original Message-----
>From: Tom Hammond <n0ss at earthlink.net>
>Sent: Oct 26, 2006 11:12 AM
>To: Lars Edwards <larse at hiwaay.net>, elecraft at mailman.qth.net
>Subject: [Elecraft] Re: Elecraft K2 TR adapter
>
>Lars Edwards, wrote regarding the K2 T-R Relay Driver Adapter PC Board:
>
>>Do you by any chance have a board and parts kit available and if so 
>>what is the cost inc. shipping ?
>
>Using appropriate components, this device should key just about any 
>T-R line presented by an external RF amplifier which must key +120VDC 
>or less at no more than 3A. This includes virtually all current 
>production HF amps, including the Heathkit SB220/SB-221 series of 
>amps.. though the Heath amps are NOT QSK-capable unless they have 
>been modified.
>
>So far, I've only offered the PC board itself.. for $6 ppd to your mailbox.
>
>Up to now, I've made the boards, in small quantities, in my kitchen, 
>using a photographic contact exposure technique which yields 
>excellent quality boards, BUT which were hand drilled. I had no way I 
>could (to my satisfaction) tin plate the copper side of the board.
>
>Just yesterday, I sent an order to FAR Circuits, to have them make a 
>supply of PC boards which would be machine-drilled AND which will be 
>solder coated as well. I should have these new PC boards within 2 weeks.
>
>In the past, because orders have been slow, and generally few, I've 
>supplied builders with a parts listing and component part numbers 
>from Mouser Electronics (www.mouser.com). However, I'm planning on 
>'kitting' the entire kit of parts, so builders will be able to order 
>a complete kit from me.
>
>At this point, there are two models of the T-R driver circuit which 
>are available, one which uses two (2) 2N7000 MOSFET transistors, and 
>which is good to drive relays up to about 50VDC and around 200mA of 
>current, and a model which uses one 2N7000 for the input, but a 
>heavy-duty HEXFET (possibly an IRF610B) which will drive loads up to 
>about 200VDC and 3A current. ONLY THE HEAVY-DUTY driver will be 
>offered as a kit.
>
>The complete kit would run about $16 each, postpaid to any US 
>destination... $1 (US) more to a DX location.
>
>I'll still offer the bare PC boards for $6 ppd ($7 US to DX).
>
>I should have complete kits available in 2-3 weeks, bare PC board 
>(hopefully) within 2 weeks.
>
>If you wish to order a kit, please remit to:
>
>Tom Hammond
>5417 Scruggs Stn Rd
>Lohman MO  65053
>
>
>_______________________________________________
>Elecraft mailing list
>Post to: Elecraft at 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