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| To: | [email protected] |
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| Subject: | Re: LF: Ferrite RX antennas |
| From: | Stefan Schäfer <[email protected]> |
| Date: | Tue, 16 Aug 2011 18:26:07 +0200 |
| In-reply-to: | <3746D901368F4C139E414F9110153EEE@JimPC> |
| References: | <68BE37BD69E54DEE89CEBA8E30E9B94E@PcMinto> <[email protected]> <3ED8E5422F1F45DBB8186E9D9870AD63@PcMinto> <[email protected]> <938BF599006244949F6CDDB5BA91F347@PcMinto> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <0A4ED65EC3B244A3BD0DAD6ACFF43793@JimPC> <[email protected]> <3746D901368F4C139E414F9110153EEE@JimPC> |
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Hi Jim, Am 16.08.2011 17:54, schrieb James Moritz: I did the measurement with a high-Z probe while the VFO was connected to the attenuator (50 Ohm type), using a BNC T-piece. The 20 mV is the peak level (thus mVp ;-) ) while the mentioned 100 uV is rms.I took an analog homemade VFO to generate a sine wave at 137 kHz, 20 mVp at 50 Ohm, measured with an oscilloscope. Then i added a 43 dB attenuator between RX (which has a 50 Ohm input) and VFO.So, assuming the oscilloscope also had a 50ohm input termination, the input to the receiver would be (20mV - 43dB) = 142uV, actually 3dB more than the 100uV figure you mention. 73, Stefan/DK7FC |
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