|Parts included in kit|
|Top Side of board with 3 bridge resistors|
|My tuner build|
|Bottom of board with tapped inductor, switch and polyvaricon|
|KI6J SOTA Station Tuner in upper right of pack, rig is ATS-3|
9/2910 Added the 5100 ohm test resistor to the output and tried it with the MFJ 259B set to 40M. A nice dip was obtained in both switch positions. With the bridge 'in circuit' the Analyzer read about 1.5 and with it switched out it read about 1.2 to 1. This was done holding some of the connections and it was somewhat sensitive to hand position.
|Schmatic of End Fed Tuner de KI6J|
Post taken from AT Sprint Yahoo Group
To all: here's a link to three pictures related to KI6J's little, teeny, efficient and just down right cute end fed half wave antenna tuner:
One pic is a snap shot of the antenna analyzer's view for the original prototype version - Stu, KI6J, told me today that improving the parts layoout in Version 2 has reduced the reactive component to nearly zero, but I don't have a copy of that snap shot to share!
One picture shows Version 2 - the tuner and SWR bridge assembled and installed in a small project box - darn cute little thang!!
The last picture shows just the tuner board in the ugly style of construction.
Stu is commiting to produce 100 kits for the EFHW tuner with built in SWR bridge. He has found a source for all of the components and is working on the PCB artwork now. He expects to have the kits - tuner and SWR bridge - available by the first week of August 1, and expects the kit to sell at $30 plus shipping. Note: the board is being designed to fit in the Radio Shack 2x3 inch project box ($3 at radio shack) but the builder will have to provide the enclosure and RF connector of choice.
Thanks to all that have already contacted Stu and myself, and others interested in this end fed halfwave tuner - it works GREAT! I've got one and find it to be the easiest antenna system to set up, tune and get operate.
Stu's e-mail address is: ki6mwn@... and you have mine. Please let Stu and I know of your interest in purchasing one of these sweet 40-15 meter end fed half wave tuners; notifying him/I will make it easier for Stu to plan his off-work hours accordingly and have the tuners ready as close as possible by that first week in August - if that date slips more than a couple of days, Stu or I will notify you individually. If you have technical questions, address those with Stu.
Please pass on, as appropriate, to other hams you interact with and think might be interested in this tuner and SWR bridge.
Best regards, Jim Rodenkirch, K9JWV
Disclaimer: I have no financial interest in this endeavor - Stu and I are friends and I appreciate all he's done to get this end fed halfwave system up and running; I, simply, believe in this product, LOVE how it works for me and want to share it with other QRPers! I, probably, will handle the shipping of the orders for Stu as there is no sales tax for out of state deliveries here in Utah; whatever my shipping costs are to your specific locale will be the cost to you.
Note added Sept 2, '11
Hendricks now has a very similar kit see Hendricks SOTO EFHW