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Post by Druid Hills Radio on Mar 14, 2018 18:07:20 GMT
I wonder what has changed with this transmitter. I noticed the date on the FCC Cert is 2013. I thought this machine has bet around longer than that. Maybe not?
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Post by Admin on Mar 14, 2018 18:56:58 GMT
I bought 3 when they first came out circa 2008 (maybe even 2007).
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Post by Druid Hills Radio on Mar 14, 2018 19:39:05 GMT
I bought 3 when they first came out circa 2008 (maybe even 2007). Something must have changed that required a re-cert both in Canada and the States. Maybe a critical part change due to availability. |
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Post by thelegacy on Mar 17, 2018 1:53:19 GMT
I have heard that the antenna is better supported.
I'd also like to see C-Quam AM Stereo.
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Post by Boomer on Mar 30, 2018 1:36:30 GMT
I heard that someone was having problems with their Procaster having interference with other stations at night, and listened to their tape on the problem page at Chez, and it sounded like the signal was 'FMing' to me. Nerdgasm: 'FMing' is a small amount of unwanted frequency shift that happens for some reason, usually along with the desired amplitude modulation. It sneaks in through a feedback loop from the modulated stage to the oscillator, through RF coupling or by the power supply sometimes. Wires in the transmitter's circuit, even very short traces on a board, can act as antennas, and modulated RF can feed back into the oscillator, causing the frequency to shift in time with the sound. Voltages can change on the DC power lines on a circuit board due to the modulator pulling more or less current as it modulates, or modulated RF getting on the DC lines themselves. AM receivers can take a small amount of incidental FM and it won't be heard, but throw in the carriers from distant broadcasters, then the FMing carrier beats against those carriers and it will come across as a growl like I heard on his recording. It seems like that's what's happening to yours, and it happens on my Talking House too. If your transmitter had been working fine before, I'd check for bad bypass capacitors.. I can't seem to find the guy's post about his Procaster now, to see what else he might have said, so I posted here and hope he sees it. My Procaster is ten years old, a square box one, and it has no issues with FMing, in fact it's rock solid, and I've been out testing it many times at night on all different kinds of radios. Here's a recording I did back last summer, it's about 10 pm and I took a portable radio to an industrial type area to see what kind of coverage I might have there, day versus night. I have audio going straight in from a PC, and I think the Procaster's processing is on inside the little coupler box, and it's been set for 2:1 compression I think. AM 1610 Procaster Test.mp3 (200.58 KB) Boomer |
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Post by Deleted on Mar 30, 2018 3:17:26 GMT
The Chez Radio Link I Think You Couldn't FindChezradio isn't a member here, so he will not see your post, Boomer. Here is the link to the correct Part15(dot)US thread... Chez Radio At Part15_US
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Post by Boomer on Mar 30, 2018 14:45:24 GMT
Bow to Carl
You figured it out. I thought the post was here but couldn't find it, and even looked at P-15(US), not even a day later, and apparently the thread was pocketed already.
Well, my note was to Fjockey of Troubadour radio, after listening to the audio he sent to Chez's problem page, where I heard what sounds like FMing at the end of the recording, and believe his problem to be real and not an illusion.
I like technical mysteries, and would rather work on those than play Sudoku or other puzzles.
Boomer
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