[ARC5] AN/ARC-5 on MF 630 Meters

[Christopher Bowne]

Most likely the coax feed line was tapped a number of turns up from the cold end of the grounded loading coil for impedance matching. Commonly done on electrically short mobile antennas where either a base loading coil is fed this way or a small shunt inductor is placed across the feed line.  I use a shunt match coil this way at the feed  point of my 1/4 wave 80 meter inverted L or my 160 meter K6MM helically loaded vertical that use a set of 15 elevated radials (nominal 8 feet above ground as a counterpoise.  On 630 meters I will be using an approxImate 800 micro Henry loading coil with internal variometer with the 80 meter incerrr inverted L, and a multi tapped ferrite core transformer for impedance matching and decoupling of the feed line from common mode currrnts. The transformer will be able to match feed point impedances between 12.5 and 200 ohms to the nominal 100 feet of 50 ohm coax feed line back to the basement ham shack.  To load the BC-191 to full rated   power into a 50 ohm non-reactive load all that is needed is about 2000 pf of shunt capacity across the TU-26B tuning unit output link coupling at the transmitter end of the feed line.

73 de Chris AJ1G
Stonington CT





Sent from my iPhone

> On Mar 18, 2022, at 20:42, David Stinson <arc5 at ix.netcom.com> wrote:
> You have all my sympathy, Mark.
> Recovering from my own cancer surgery,
> a long-term "gift" from my nuclear past.
> Prayers for your recovery.  Keep optimistic!
> 
> Dave S.
> 
> 
> -- 
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
> 
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: https://www.qsl.net/donate.html