XPost: alt.home.repair, sci.electronics.design
From: '''newspam'''@nonad.co.uk
On 25/12/2022 22:55, micky wrote:
> In alt.home.repair, on Sun, 25 Dec 2022 16:56:38 -0500, Rachelle
> Walenski wrote:
>
>> micky wrote:
>>>
>>> Technical qustion about wave valleys and troughs and if two radio
>>> playing the same station will be in phase wrt all frequencies, or if
>>> some will cancel out?
>>>
>>
>> Are the radios powered by the same 120v phase or on opposite legs (180
>> degree out-of-phase)?
>
> Yes, plugged into the same outlet.
The radio will convert it to DC anyway so that doesn't matter.
>
> Both are traditional over-the-air AM-FM radios, usually using FM. (One
> has bluetooth but it's not in use. )
Chances are one will be a few hundred ns time shifted relative to the
other since the amplifiers in each stage of detection are unlikely to
have exactly the same delay or frequency phase response.
Propagation of sound waves in the room will have a much larger effect on
what you hear. Positioning of the speakers relative to hard surfaces.
>
> (To other poster, The radio with the bad speaker switch works well if
> the switch stops in the right spot, and sometimes it will stay that way
> for days. No access for contact cleaner at the moment.
If you really want massive flanging effects try two different digital
radios or SDR decoders within earshot. The difference in delays then can
be fractions of a second or seconds when compared to an FM radio.
DAB is completely useless in an emergency situation unless you have a
shed load of batteries. Uses a set every 8 hours of run time. A decent
FM radio will run for a week or more on just one set of batteries.
--
Regards,
Martin Brown
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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