- what makes radios drift from the proper tuning? - 4 Updates
- Which 'scope? - 1 Update
| micky <NONONOmisc07@bigfoot.com>: Feb 20 10:35AM -0500 In alt.home.repair, on Wed, 20 Feb 2019 17:49:56 +1100, "Rod Speed" >> Digital radios won't work here. They all afaik >> have a separate momentary-on on/off switch. >Not all of them do, most obviously with car radios. Good point. But the 3 I have do. I'm not buying another unless I was sure it would get 88.5 and I've tried testing it in the store. Might work there but not when I get home. >> FM and the radio was AM. Nonetheless, I turned on a TV and found >> the channel it was receiving. >Yeah, you can decode FM with an SSB receiver. Very interesting. >Likely it was an intermodulation that you were >receiving and the signal it was intermodulating >with was what was drifting that dramatically. Very interesting. >> the AC filter capacitors. Everything else still >> works, even though it's about 85 years old now. >Yeah, they do last well. I may give it a party when it turns 100. |
| thekmanrocks@gmail.com: Feb 20 08:11AM -0800 Ralph Mowery wrote: "as it warms up it should drift to the station" From which 'side' of the station as selected on the dial? |
| devnull <devnull@127.0.0.1>: Feb 20 06:21AM -0500 On 2/19/19 11:27 PM, micky wrote: > BTW, I've been on 3 trips in the last 2 years totaling 160 days and no > one has bothered my house at all. I just want to keep it that way. Life is a constant battle of keeping burglars out of my house and democrats out of my paycheck. Democrats suck! |
| Chuck <ch@dejanews.net>: Feb 20 10:34AM -0600 On Tue, 19 Feb 2019 18:58:31 -0500, micky <NONONOmisc07@bigfoot.com> wrote: >I can't use radios with electronic tuning because with a timer that >turns the power off and on, when it comes on, the radio doesn't start >until someone pushes a button. If you can find an older Sony Boom Box like the CFD-5 that tune locks, it won't drift at all. I have one on a timer and the station is always still locked after I come home from a trip. |
| tabbypurr@gmail.com: Feb 20 12:31AM -0800 On Tuesday, 19 February 2019 20:16:31 UTC, Phil Allison wrote: > Audio is ELECTRONICS, not sound. > The range of frequencies found in audio electronics extends to frequencies of many MHz. Domestic AM and FM radio deceivers are considered "audio". > Radio microphones are considered "audio". I'm sure we covered this already. The OP did not ask for a scope to do radio work with. He is not servicing hifis. > Faulty ( or badly designed / built ) audio amplifiers may exhibit oscillation upto 50MHz. which even a clunky old 1MHz scope can pick up using an envelope detecting diode. > Digital audio seems to know no bounds. It's the OPs choice whether to spend 3 figures on a scope that can handle every piece of digital audio in existence or 2 figures for one that can do more or less everything he's likely to work on. Given that he's a curious hobbyist, the latter seems more sensible. However, it is the op's choice, not mine or yours. There really is no point covering this ground yet again. NT |
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