As I was curious about the MFj 915 I purchased I thought I'd download the instruction manual.
It is a one page instructional exslaning the install. It directs the new owner to install it at the point of tx.
Which I thought to mean at the output of the transceivers so 239.
It didn't make sense as I thought the choke was to "choke" the rf from traveling down the antennas feed point and back into the shack.
So I began to do some more searching. And sure enough came upon a wwdx posting from 2008 saying the MFj 915 instuctions install manual is incorrect.
Not many replyed to the op but those that did said MFj is known for printing improper manuals for many of there items but normaly would correct them in time.
I would think if they corected it seven years later they also would have corrected the free downloadable manual but they haven't.
If I'm going to get the same instruction manual from 08 I'm obviously gonna ignore it. Im assuming a jumper will be installed in the antennas so 239 then my lmr 400 from the transceiver screws into the other end of the 915.
If I'm correct should the 915 be placed 2' below the feed point as if it were treated as an ugly balun (coax choke?)
If anyone uses an mfj 915 or has ever insalled one, can you please tell me the proper way to install it? Id hate to wait for the day I recive it to begin asking how to correctly put it on the a99. Im kinda hoping MFj updated their single .page three paragraph instructional manual. But it's unlikely. Thanks. P.s. I was very impressed with just about every review posted on the 915.many differnt people use the 915 on many bands and almost every one was very impresses with it's performance at It's low price. Im confident it will work as well as if I had spent two days trying to get the correct turns and dimensions for a home brew choke. And truthfuy l probably never would've got it correct. QUOTE="wavrider, post: 526486, member: 9893"]No problem Stella.
If one doe snot know what to look for on CMC besides the obvious, TVI, RFI, PC speakers etc etc then it will go un-noticed.
The First issue I was able to say definitely that a 1:1 current balun workd to solve CMC was on a 40 meter ground mounted phased array,.
I was trying/learning about the Christman method of forced current phasing and one antenna was not playing right.
After a few days of scratching my head I decided to put a 1:1 current balun at the feed point of the one vertical, Finally the array started acting like it was supposed to.
It was a fun learning experience and made a believer out of me when it comes to chokes and baluns
