Thanks JC, I am reading it right now, very interesting indeed.
73's Filipe Lopes CT1ILT - CR6K F4VPX - TM3M 2015-10-12 22:27 GMT+02:00 JC <[email protected]>: > Hi Felipe > > > > It works like a voltage divider where the impedance to ground should be > lower as possible to give you more attenuation like 1k/500ohms versus 1K/5 > ohms divider. You should use the choke near a good ground before entering > the station. If you switch box have a good ground it’s a good place to > install it. > > More turns better, but it is limited by the diameter of the coaxial cable, > like RG58/RG142 allows 12 to14 turns. RG213 only 8 turns. > > > > Jim K9YC and a fantastic documentation about chokes. Please read this > document > > > > http://audiosystemsgroup.com/RFI-Ham.pdf > > > > You will be a specialist after reading this guide. > > > > Regards > > JC > > N4IS > > > > *From:* Filipe Lopes [mailto:[email protected]] > *Sent:* Monday, October 12, 2015 9:52 AM > *To:* JC <[email protected]> > *Cc:* topBand <[email protected]> > *Subject:* Re: Topband: Commond mode choke for Beverage > > > > Hello JC, > > > > Thanks for your answer. > > > > I just ordered a few 2631803802 and 5943003801 from mouser. > > > > With these ferrites I ask the same question, should I put the choke close > to the 9:1 Balun or near the switching box and how many turns? some bevs > have the feed point at +- 60m away from the switching box. > > > > > 73's Filipe Lopes > > CT1ILT - CR6K > > F4VPX - TM3M > > > > 2015-10-12 15:40 GMT+02:00 JC <[email protected]>: > > Hi Filipe > > Zero , you should use material #31 or #77 , The core you have is not good > for low bands. > > JC > N4IS > > -----Original Message----- > From: Topband [mailto:[email protected]] On Behalf Of Filipe > Lopes > Sent: Monday, October 12, 2015 8:46 AM > To: topBand <[email protected]> > Subject: Topband: Commond mode choke for Beverage > > Hi guys, > > I am about to add a common mode choke to isolate the antenna from its > feedline to each of my beverages and I only have FT240-61 ferrites. My > question is how many turns should I do on the ferrite using RG58 (all my > bevs are fed with RG58). Also should I put the choke near the 9:1 balun or > near my bev switching box? > > Thanks in advance. > > 73's Filipe Lopes > CT1ILT - CR6K > F4VPX - TM3M > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
