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| To: | <rsgb_lf_group@blacksheep.org> |
|---|---|
| Subject: | Re: LF: Re: PA0RDT miniwhip in TX? |
| From: | Roelof Bakker <roelof@ndb.demon.nl> |
| Date: | Thu, 23 Sep 2010 12:12:59 +0200 |
| In-reply-to: | <83C816123DA149C795C7363CC6BB4B48@JimPC> |
| References: | <000c01cb5a7a$44cfcc50$0401a8c0@xphd97xgq27nyf> <4C1A271605FB0B62@smtp208.alice.it> (added by postmaster@alice.it) <83C816123DA149C795C7363CC6BB4B48@JimPC> |
| Reply-to: | rsgb_lf_group@blacksheep.org |
| Sender: | owner-rsgb_lf_group@blacksheep.org |
| User-agent: | XS4ALL Webmail |
Dear James, Thank you very much indeed for your thorough analysis. The estimated 3 pF antenna capacitance is about right and is the same as for a 30 cm long whip. A 30 cm long whip and a 30 x 40 mm PCB antenna give the same signal output. However, I don't know if the induced voltage due to a near lightning strike will be the same for both antennas. As the field strength is proportial to the length of a whip, my guess is that for the PCB antenna it probably is less. But this assumption might be totally wrong. 73, Roelof Bakker, pa0rdt |
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