Anyone ever see this? its pages of exhaustive detail (which I only skimmed over), but he made an interesting observation about the Schlockwood:
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My DIY AM audio broadcast processor from scratch
https://darkliferadio.proboards.com/thread/1029/diy-audio-broadcast-processor-scratch
Kage
Administrator

Apr 10, 2019 at 3:34pm
Quote
In this thread I will describe my endeavors with designing my own three band audio processor aimed at AM hobbyists... I will start this with a primer on audio processing in general and move on to the circuitry involved in solving these problems, and eventually my finished circuit which has come along nicely shared to the general public free to copy and use...
[Some one mentioned the Schlockwood, along with a mention of Rugsters blog]
...Wish I had the opportunity to try it but by looking at the specifications it's not far off from what my own processor does. It doesn't have a triband downward expander like mine that I can tell but does have a noise gate which almost accomplishes the same task for removing background noise or tape hiss before hitting the compressors.
Only thing I don't like about the specs is the output filter starts rolling off right around 6kHz on the high setting, and on the low setting to make it NRSC compatible it rolls off around 4kHz which is far too low in my opinion for high fidelity audio.
I kid you not, 3 ads are currently breaking up my short little post above! (Well guess it wasn't that short, but still!)
@richpowers I have Firefox and as mentioned got the ad blocker and there's no ads anymore. $12.00 a year, that's right, a year. Thanks to Rugster for informing me about this.
I've studied his work and it all seems quite reasonable.
@jsh4 I've never built any kit. How easy you think it would be to build?
@richpowers Kit building with decent instructions, time, and patience is usually easy enough. The situation with the Kage circuit appears to be lack of any real kit to purchase and build. I finally went with the Schlockwood SW200 as a quick and ready to go AM audio processor.
@jsh4 I use the Schlockwood for FM also as it works fine just by a couple of jumper changes.
Who has used the Sean Cuthbert compressor? I know it's been talked about before, but at $200 I wonder if it might just be worth biting the bullet and adding a couple more hundred more for the Schokwood.. but I just dont think that's happening with either option anytime soon.
Still, I'm wondering whose using or has used the Sean Cuthbert proccessor? I'm aware of Radio Jay Allen's review ( https://radiojayallen.com/cuthbert-6-channel-3-band-stereo-audio-compressor/ ) but wondering if anyone here has first hand experience with one.
@jsh4 - I'm thinking that setting jumpers JP4, JP5, JP6, JP7, and JP8 to be hanging off the edges of the header (i.e. not plugged in) would be it. This opens up the audio response to the full 10KHz. It's described on page 15 of the manual, under the heading "Secret Settings". I use that setting for AM too. As Part 15'ers, we're not subject to any bandwidth restrictions. Also, I'm thinking that JP3 (page 17) might be worth experimenting with, to remove pre-emphasis altogether, for FM transmitters which have it built-in.
@jsh4 To use it for FM you have to disable the pre-emphasis, there's a jumper for that(JP3). So the front pre-emp control will not do anything. The frequency response will be flat across the board. Also don't engage JP 4 5 6 7 8, leave off. Also turn the positive peaks on the output off by turning counterclockwise 15 turns.
I also had to do a small mod to have the balanced TRS output work with a stereo unbalanced TRS input that most transmitters have. Jim Wood told me what to do. If using for FM as you know the Schlockwood is a mono processor but that doesn't matter to me as majority of my stuff is mono and all receivers are more sensitive in mono. When you are listening to a radio with one speaker stereo means nothing! Mono FM also gets you a bit more range than stereo.
@richpowers I have used it but it had a flaw in that when song starts, the initial beat/note at the beginning distorted like overmodulation for that 1/4- 1/2 second and sounded horrible. After that was good but that was a deal breaker. No matter what I did in the settings there was that half second that until the processing "kicked in" it was bad. The Schlockwood has none of that.