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| To: | [email protected] |
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| Subject: | Re: LF: Re: MiniWhip antenna, fiber optic TEST SIGNALS NEEDED on 630m WSPR |
| From: | Stefan Schäfer <[email protected]> |
| Date: | Sun, 14 Jul 2013 16:16:53 +0200 |
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| References: | <CAKvcm2dpuftdtK6OdQv8fOfiw+4yQrPBQBHJ-FN2gDbT4P_oMQ@mail.gmail.com> <005b01ce798a$b0476600$6d01a8c0@DELL4> <op.wzrfpjyyyzqh0k@pc-roelof> <[email protected]> <7D6B8CBB38964C9C82487F5D0F3648FC@FMVXD1232> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <001601ce7c95$f235b360$6401a8c0@JAYDELL> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <op.wz4k19tayzqh0k@pc-roelof> <[email protected]> <[email protected]> <[email protected]> <op.wz7hsj1jyzqh0k@pc-roelof> <[email protected]> |
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Hello Hideho, Am 14.07.2013 15:44, schrieb Hideho YAMAMURA: This is what I thought, and I made a pi shape filter : Gnd - CMC - Gnd. Pse see attached. That looks nice. Thanks for the images.What is the distance between the earth rods? And what is their length? What is the distance to the shack/house/noisy earth? There are other antennas on the tower. Are they not connected ot are there other coax cables going to the shack? Can you measure the coupling capacity between the shack ground and the RF ground (coax disconnected between the earths) using a 137 kHz sine voltage? Yes indeed. My isolation transformer has 27pF between the windings, 43 kilo-ohm on 136kHz. Much more than the 3.1pF of my Mini-DP. A good example, tnx. 73, Stefan/DK7FC |
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