Hello,
Should the filter cap short, the RF choke from the antenna connector to ground would not be affected. In the older boat anchor radios, the 2.5 milli-Henry RF choke at the coax connector to ground actually did nothing, until the RF coupling capacitor that keeps B+ off the antenna shorts, allowing B+ onto the antenna. Then it acts to short the B+ to ground, hopefully blowing the radio's fuse in the process. It also keeps the unsuspecting operator from having 500 + Volts on their wire antenna and not knowing it. In the case I mentioned, again, it does nothing until there is a surge of static charge, and then it shorts this to ground, probably only a few MA, and since the RF choke was designed for 500 MA or so ( if a RF choke from an amplifier is used ), it should have a long life. As someone else pointed out, a high value resistor would bleed the static charge, it would not short the B+ to ground should the coupling cap short. 73, Sam Neal N5AF ----------------------- ------ Original Message ------ Received: Mon, 23 May 2016 01:26:38 PM CDT From: <[email protected]> To: <[email protected]> Subject: Re: [BVARC] Bleeding static So, say the cap does short, placing B+ on the antenna...the DC short to ground thru the choke does what? Heats the choke and then it blows up? Shorts the B+ to Gnd and kills the HV PS? I can see the benefit, but looks like it is a "fuse". Can you tell me the "designed for" scenario with a shorted HV cap? Thanks.Rick - W5RH _______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
