IMHO - W2FMI's book on baluns (& ununs) offers much insight on the subject of power ratings associated with different Balun construction - highly recommended reading. One may also find some good info
Another simple and effective option is to put the tuner in the shack and feed the antenna with ladder line through a balun. Matt KM5VI --Original Message-- From: TowerTalk [mailto:towertalk-bounces@c
bands? I suspect that the patterns can get somewhat chaotic on the upper HF bands with say an 80 through 10 meter doublet? Hi Tony, In a multi-band doublet, the physical length of the antenna relati
Hi Tom, Thanks for your comments & I agree with you that all antennas are certainly compromises of various parameters and no one antenna can do it all - certainly one of the mantras of our hobby. I r
1. Can you clarify that you mean to wind an RF choke on the FT-240-? core using magnet wire? Just speculating here, but since you mention Polyphaser in the same post... are you wanting to create an R
Suggest to check the wiring inside the rotor connected to terminal #1 (ground wire). The potentiometer and the motor both use this common ground connection to complete their circuits. The brake circu
I would appreciate recommendations for general purpose SPDT relays that can be used reliably for RF antenna switching duty - it is not a hot switching application. I am aware that the DC & 60hz AC ra
Only resonant & matched antennas these days John... thanks for your help. Matt There are so many inexpensive relays that will work for RF antenna switching, assuming that you don't have excess voltag
Just wanted to says thanks to all who responded with information, recommendations, and advice on relays. Much appreciated! Matt KM5VI _______________________________________________ Amps mailing list
Hi Mike, I can't imagine that a few 100 feet of extra length would make any discernable difference in signal loss - especially on low bands. There are 1000 ft feed lines (RG-6) on some of my Beverage
In the interest of sharing - poor signal strength issues with Beverages are most likely attributable to the balun and/or feed system rather than feed line losses. Low SWR is not an indication of high
Hi Julio, Pretty much any standard, general purpose TEFC (totally enclosed fan cooled) NEMA frame 56 motor of the same RPM & fractional HP should work fine. If you don't have the original I think the
Thanks Pat - just wanted to confirm that I used the wrong term - NOT autotransformer, but isolation transformer.... Matt Google autotransformer and see something like: /Auto Transformer/is a kind of
Hi Hans, For the purpose of adjustable nulling, take a look at the NCC-1 : http://www.dxengineering.com/search/department/antennas/section/receive-ante nnas-and-arrays/product-line/dx-engineering-ncc
Hi Jim, To my knowledge... Series 1 & 2 control boxes for the early Ham-M produced 1957-1959 are not compatible with any of the later model rotors. Series 3, 4, and early series 5 boxes for the Ham-M
Hi Jim, Do you have any experience or knowledge you can share about how well the shielding performs or compares at HF for double & triple shielded RG-6 & RG-11 cables? These (Commscope brand) ) have
Hi Patrick, Just another take on the chronic problem with the older terminal block design that you mention... My solution was to replace the terminal strip with a blank-off plate through which I pass
Hi Jorge, The component ID's should be marked on the circuit board. C1 & T90 (2 each in bridge configuration) comprise a hybrid quadrature bridge circuit providing +/- 45 degree phase shift at resona
Hi Gerry, I used a 6 element Sterba 10m some years ago... still have it in storage for that matter. It is a relatively easy antenna to build and Its performance arguably rivals a mono-bander - for fi
Just a suggestion, but you may want to look at renting a shooting boom forklift. It is much cheaper than a crane and pretty simple to operate. Not only will it safely lower the tower but also comes i