I have an old analog clock radio and most afternoons, stations like KCSM (and others in proximity) are all but drowned out by Spanish-language programming. This stops around 6pm and then those stations come in normally. Not a problem on any of my digital receivers, just the analog one.
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Spanish-language pirates on Bay Area FM?
- Thread starter RadioJunkieMike
- Start date
What frequency, what area of San Francisco?
KCSM is 91.1, tho' it seems stations on either side of it are also being interfered with, including KPOO, which is 89.5. I live in the Mission District, so Southern part of the city proper.
I haven't listened lately, but there was a pirate FM Spanish church station, they were broadcasting from near 22nd and S Van Ness but I couldn't pinpoint them exactly. I wonder if that's it.
Alternatively, it could be a new translator like this:
https://www.rbr.com/symphonic-static-new-translator-frustrates-classical-power/
Alternatively, it could be a new translator like this:
https://www.rbr.com/symphonic-static-new-translator-frustrates-classical-power/
22nd & S Van Ness is right in my 'hood, so that could be it. I'm aware of the KDFC situation but per a post on their website recently, that problem was resolved.
K
kf4rca
Guest
Could be not a problem at all. Your old analog receiver most likely uses LC tuned circuits in the IF strip. Not very selective. Newer receivers use ceramic filters which are "brick wall". Here's a tutorial on FM receiver IF design:
http://www.fmtunerinfo.com/filters.html
In a crowded FM band such as a metro market, your clock radio would have problems.
I'd hate to turn on my 60's vintage KLH tuner and try to tune in something in my market.
Although there may be pirates also, they may be mobile CD FM transmitters. The old ones had only 8 frequencies (4 at the top and 4 at the bottom).
But the newer ones are fully frequency agile!
http://www.fmtunerinfo.com/filters.html
In a crowded FM band such as a metro market, your clock radio would have problems.
I'd hate to turn on my 60's vintage KLH tuner and try to tune in something in my market.
Although there may be pirates also, they may be mobile CD FM transmitters. The old ones had only 8 frequencies (4 at the top and 4 at the bottom).
But the newer ones are fully frequency agile!
I know there's a Spanish Pirate radio station that broadcast on 99.3 FM (Used to be 102.5) FM. That broadcast from 11am to 6pm everyday. The signal tends to be strong around the Mission, Dogpatch, Potero neighborhoods of San Francisco. Also, I see flyers around the mission neighborhood in San Francisco.
It looks like 99.3 K257GE (KGMZ 1550 Channel Q) is on the air. Unfortunately, their transmitter is on top of AM 1400 KVTO studios along Laguna Honda Drive instead of Mt. Sutro. Because of their transmitter location is in the canyon near Forest Hill Muni station, it only can be hear within the 5 block radius. Plus, the Spanish language pirate radio over kills the 99 watt coverage towards the east of the transmitter site.
Those ceramic filters do affect frequency response on musical passages. And if the pirate overmodulates, there may be a large amount of distortion. Most people don't care anymore, if they ever did. A Tom Kneitel design home brew FM transmitter from the 1960s had that problem on narrow IF receivers, like Panasonic and Technics tended to be. You could back the modulation off until there was little distortion, using the Panasonic or Technics as a primitive modulation monitor.
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