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#21
September 24th 03, 11:04 PM
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In article , mike
writes: On 23 Sep 2003 05:09:01 GMT, (Avery Fineman) wrote: Silly me, I put them all in parallel.grin. I am a mechanic with some electrical knowledge, but not much electronics. So the resistor should be in series with the diodes to limit current. A side effect I noticed after installing the 1N914 diodes was images scattered across the bands. For example, wwcr on 3200 was also on 2300. Another gentleman posted me link in the antenna group where he found the same thing happening. Might the resistor in series with the diodes reduce this side effect? The effect should not be there with or without diodes, with or without any resistors...unless there is some VERY big RF source out of the receiver's tuning range that is supplying energy to the diodes and thus causing the "mixer" effect. It might be possible if you have some Local Oscillator energy leaking out to the antenna connection, but even that is unlikely given "modern" (in the last couple of decades) receiver design. The diodes should not have any effect on anything but a few millivolts of any signal arriving on your antenna. A non-conducting diode simply shows a junction capacitance to the rest of the world. That's a minor reactive discontinuity to the antenna connection. It might be possible that some unusual circuitry in your receiver presents a DC Voltage at the antenna port. If so, it might cause one of the diodes to conduct. It would be better then to AC-couple the back-to-back diodes to the receiver through a capacitor of 0.001 to 0.01 uFd to eliminate that possibility. You should be able to measure any DC potential at the antenna port with a high impedance multimeter. Len Anderson retired (from regular hours) electronic engineer person |
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