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Post by Deleted on Dec 7, 2016 2:35:32 GMT
If What I heard Is True
The Rangemaster 1000 can be internally adjusted to present exactly 100 mW to the final RF stage, and when that's done the audio modulation can be set for optimum results. Also, the Rangemaster can be set for greater than 100 mW to the final, but from what we've read the audio will sound increasingly distorted the higher the output power goes.
The SSTran AMT5000 doesn't suffer from that limitation. In my personal experience I've discovered that the AMT5000 can be set for a range of about 34 mW to 400 mW to the final RF stage, and the audio modulation control can be lowered or raised to achieve the same perfect modulation at any power setting.
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Post by mighty1650 on Dec 7, 2016 13:58:39 GMT
I've been able to get my RM up to about 700mW without any ill-effects to the audio quality.
I've seen this mentioned everywhere but haven't experienced it myself.
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Post by Deleted on Dec 7, 2016 14:45:29 GMT
On Target
That's exactly the kind of input I was hoping for, Mighty. If incorrect information is being said about any of the part 15 transmitters we need to set it right.
After everything that has been said about AM transmitters and following my limited experience, I realize now that I should obtain and do tests on as many of the transmitters as possible so that I can try to add a fair and unbiased voice in reporting the results.
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Post by Druid Hills Radio on Dec 7, 2016 15:29:01 GMT
On TargetThat's exactly the kind of input I was hoping for, Mighty. If incorrect information is being said about any of the part 15 transmitters we need to set it right. After everything that has been said about AM transmitters and following my limited experience, I realize now that I should obtain and do tests on as many of the transmitters as possible so that I can try to add a fair and unbiased voice in reporting the results. I own 2 RM. I can assure you that when you increase the power level beyond 400 mW the audio level goes down. It is not distorted just not fully modulated. This information is based on my personal experience as well as input from the designer. Regards, |
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Post by Deleted on Dec 7, 2016 15:49:06 GMT
More Good Input
Mr. Druid Hills shared his experience with the Rangemaster: "I can assure you that when you increase the power level beyond 400 mW the audio level goes down. It is not distorted just not fully modulated. This information is based on my personal experience as well as input from the designer."
The same thing is true of the AMT5000... that is, when the carrier power is increased the modulation lowers... but the audio level can be increased to bring the modulation up to the level needed to match the carrier power.
Why, then, is it not possible to increase the audio level to the Rangemaster to fully modulate the carrier at power levels above 400 mW?
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Post by mighty1650 on Dec 7, 2016 18:24:23 GMT
That's one thing I can't really test since I lack a mod monitor, I can get the RM just as loud as the commercial stations at full power but no idea if that is any reliable indication of actual modulation levels. The RM wasn't really designed to be at full tilt anyway but it is impressive what it can really do. More impressive is the range that can be obtained with 400+mW, easily reaching 15 miles, I keep it at 100mW.
My particular unit can hit 700mW but the common max output is around 400mW.
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Post by Deleted on Dec 7, 2016 23:06:53 GMT
Re-Thunk
I am here to revise some of my responses to postings by Mighty 1650 and Druid Hills.
You both described experience which contradicts what others have said and which I quoted at the beginning of the thread.
My first reaction was to declare that I'd get a Rangemaster and find out. But that response makes it sound like I don't take your word for it and need to prove it to myself, which I now wish to revise.
From now forward I will take your testimony as "the corrected truth" about the Rangemaster's modulation capability, and I will stop quoting the incorrect rumor, and take any opportunity to set the record straight.
I still might get a Rangemaster so I can learn about range performance.
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Post by mighty1650 on Dec 8, 2016 12:57:52 GMT
Like all electronics there is probably some variation between Rangemasters, especially when comparing the old ones versus the new ones. I would not consider mine to be the norm.
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Post by Druid Hills Radio on Dec 8, 2016 14:14:23 GMT
I might also add that missing member (Part15.us) Ermi Roos determined by physical examination of the Rangemaster that the output section was Class D.
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Post by Deleted on Dec 8, 2016 14:29:34 GMT
He Reads Schematics While Others Read Magazines, Newspapers or Novels
That's true. I'd prefer to sit gawking at a good schematic.
Just the other night I was telling Jeff Station8 that, for all the manuals he's collected for posting at TheALPB_com, there is no Talking House diagram and come to think of it we've never seen the Rangemaster schematic.
When I spend the $700 it will be more for the schematic than the actual transmitter.
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Post by Druid Hills Radio on Dec 8, 2016 14:50:18 GMT
He Reads Schematics While Others Read Magazines, Newspapers or NovelsThat's true. I'd prefer to sit gawking at a good schematic. Just the other night I was telling Jeff Station8 that, for all the manuals he's collected for posting at TheALPB_com, there is no Talking House diagram and come to think of it we've never seen the Rangemaster schematic. When I spend the $700 it will be more for the schematic than the actual transmitter. There is a jpg file of the output section only, hidden in the vault at Snobby Broadcaster. I will see if I can extract it using clandestine methods. |
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Post by Admin on Dec 9, 2016 4:09:47 GMT
I have the Patent version schematic of the Talking House transmitter and ATU if anyone wants it. It's at least a good starting point.
I thought Jeff included that in his docs. I'll have to see about adding it on The ALPB site.
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Post by Deleted on Dec 9, 2016 11:03:11 GMT
Time For a Tour
Jeff Station8 loaded the ALPB site with manuals and schematics, and he's working on more.
I need to take a tour of our collection...
Jeff has MORE transmitter docs being prepared for posting, and when he's caught up I will submit to him the three versions of Knight Kit AM Phono Oscillator schematics that I have.
The ALPB is here and now.
hobbybroadcaster_net is nowhere to be found.
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Post by End80 on Dec 20, 2016 7:53:42 GMT
I always adjusted mine as per instructions with a meter and the "green light" indicator, so I can't really comment on your observations..
However, about ten years ago (as in the story I have told before) I had it atop the roof of the islands pavilion grounded to the heavy copper cable grounding system and easily was achieving over ten miles, although it was strange.. once I got about 3 or 4 miles away the signal would be lost completely, but would return again loud and clear on the next island about 10-12 miles away...
When I had mentioned to my boss (who ran the businesses on the pavilion) that I need to disconnect that thing, he said "f### it, leave it like it is, it sounds good!" After a few more weeks something went wrong with it, and it wasn't transmitting correctly, getting weak audio, I disconnected it and sent it to Keith, who said it had some vacuum tube or something like that went out, he said it was probably caused from static build up from lightning, he repaired it an sent it back in perfect working condition..
Not long after that I had ran into the Savannah city manager at the city dump one day, (he had used to be a regular customer of mine where I used to have a small diner), and he asked me what happened to my station that he couldn't pick it up anymore, and I told him I had to disconnect it before I got in trouble.. He replied "Who's going to say anything?".. I just answered no, no, no, I don't think so.
That transmitter eventually got stolen, and I bought another one from Keith a few months later.. It may just be in my head, but I always thought my first one had a more vibrant sound.
Well Carl, that sums it up for my useless answer to your question. But it is one of my favorite stories, and the only time I ever pirated.
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Post by Druid Hills Radio on Dec 20, 2016 13:26:22 GMT
" After a few more weeks something went wrong with it, and it wasn't transmitting correctly, getting weak audio, I disconnected it and sent it to Keith, who said it had some vacuum tube or something like that went out, he said it was probably caused from static build up from lightning, he repaired it an sent it back in perfect working condition..'Druid Hills said" There is a gas discharge tube at the antenna feed point that is tied to ground. When they do their job they fail in a short circuit condition. A common failure in a good way." |
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