On 9/9/2012 6:28 AM, hawley, charles j jr wrote: > Which begs the question...why isn't a 100K across the antenna jack in the > original design? > BTW, I use a choke across the antenna leads.
Disadvantage of a choke is that it can form a resonant circuit with the capacitance of the antenna/antenna input. Usually not a problem, but can be. And, beware of precip static. Each individual little noise pulse is a tiny charge deposited at your antenna input. Even though it looks like very low amplitude "grass" on the baseline of a panadapter, if the antenna does not have a bleed, each little charge adds to the previous ones and slowly ratchets up the potential until something [often PIN diodes in a T-R switch] fry. We managed to do in two IC-756PRO's at N6A in the Cal QSO Party during a snowstorm from this effect. With a combined ham experience of about 160 years on the crew, one would think we'd have learned after the first one went. :-) 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
