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AMT3000 and AMT5000 Mods

 
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Transmitter Talk
Last Post by RichPowers 9 months ago
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Rugster
 Rugster
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Apologies if this is old news in this forum, but I only recently discovered that broadcast engineer Clark Burgard has a web page that is devoted to information on mods to improve the performance of the SSTRAN AMT3000 and AMT5000. The information on how to achieve greater modulation depth on the AMT3000 is particularly useful. The page is here.

Detailed technical information on our Part 15 transmitters can be hard to come by, so I really appreciate these sorts of finds.


This topic was modified 9 months ago by Rugster
 
Posted : 12/10/2025 10:13 pm
RichPowers
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I don't recall that site ever being mentioned, very cool, thanks for letting us know. Along the same lines there's an AM3000 on eBay for $399 OBO let's https://www.ebay.com/itm/389044025538

s l1200 (5)

This is also good time to mention again your "Scratch Built AM3000".


This post was modified 9 months ago by RichPowers
 
Posted : 13/10/2025 5:09 am
RichPowers
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On eBay he says it's set for 700 and tested working -- I'm presuming he actually meant 1700, but who knows.


 
Posted : 13/10/2025 5:21 am
RichPowers
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Kind of thought some one here might make an offer on it by now, maybe someone did and it got turned down. I would myself but I already have a SStran which I've seldom used since I have Rangemasters..  I would buy it "just because" but I can't justify me spending more money on another transmitter when I've hardly used the ones I have in the last couple years (but the reprise is nearing).

Anyway, it's still up there on eBay.


 
Posted : 14/10/2025 3:18 pm
Rugster
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Just before I scratch-built my AMT3000 I was hoping to find one online, but wasn't interested in paying the crazy high prices they seem to be commanding now. I think that $399 is way too much for what they are. There was an unbuilt kit for one listed on eBay recently. I forget the asking price, but it was either $399, or more. I wasn't about to pay those kinds of prices for an uncertified transmitter.

There is currently an AMT5000 on eBay. They come up far less often than the AMT3000. Bidding is at $249.99 and the auction ends on Friday. My guess is that it will go for an eye-watering price.


This post was modified 9 months ago 3 times by Rugster
 
Posted : 14/10/2025 7:03 pm
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ArtisanRadio
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I've owned both.  The 3000 seems way overpriced - I never was all that impressed with it the way some seem to be.  I found that the Talking Sign sounded better overall, and had much better range.

That 5000 is interesting.  I still have a few pangs of regret selling mine, even if it isn't legal to use here in Canada (neither is the 3000).


 
Posted : 14/10/2025 7:21 pm
RichPowers
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@rugster I think the AMT3000 would be worth a $150 offer. Didn't even know there was a AMT5000 up there too, I wasn't even looking for SStrans, just stumbled across it. 

If someone pays $400 for it I'd probably put mine up for sale next


This post was modified 9 months ago 2 times by RichPowers
 
Posted : 14/10/2025 7:22 pm
RichPowers
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@artisan-radio I really like the AMT3000, it's just kind of redundant when you have a Rangemaster. But it's ideal having it on hand for impromptu installations, which are rare, but can think of a few times it's come in handy. It's potability, ease of hook up, on board processing and all, you know, 123 your set. Yeah, they're real nice quality performance transmitters. But no, not at that exorbitant price. But the auction says "Or best offer".


 
Posted : 14/10/2025 7:37 pm
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Mark
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$400 is twice as much as it was new. $150 would be a fair price. Did the SStran 3000 have access to the whole band? Maybe it was on 700.


 
Posted : 14/10/2025 7:53 pm
ArtisanRadio
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If you're in the U.S., the 5000 would be the one to go for if it is in any way reasonable in price.  You'd need a good ground (which is where the AM Transmitter Challenge fell short), but it would blow away the 3000.


 
Posted : 14/10/2025 8:25 pm
RichPowers
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Well my eBay watch list alerted me today that some one had made an offer on the SStran3000, but they apparently didn't accept because it's still live.

However, the SSTran5000 auction did sell for $391.89 and $13 shipping

My guess is that whoever lost on the AMT5000 auction then turned around and made an offer on the AMT3000 (from different seller)


This post was modified 9 months ago by RichPowers
 
Posted : 17/10/2025 5:29 pm
RichPowers
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Wel, the AMT3000 on ebay sold too for a best offer (some undisclosed price under the $399 asking price). I wonder if it is anyone we know who had bought it and how much he paid. 

Rugster mentioned earlier that he expected the other auction for the AMT5000, due to its Class E capabilities would "go for an eye-watering price." - I wasn't so sure, in fact I thought it's starting price of $249 was pushing it, I was surprised it went for almost $400. I mean it's a fine transmitterr I'm sure (I know the AMT3000 is), but what I find discouraging about both models is they require construction/design of a specialized antenna to really take advantage of their ability to achieve extended range.


 
Posted : 19/10/2025 7:28 am
ArtisanRadio
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I thought both prices were silly stupid.

Consider.  You can purchase a Cuthbert C-QUAM kit for about half those prices.  All new components - the 5000, at least, was in storage for a while, the 3000, who knows?

You can purchase a Talking House for about 1/4 that price.  Yeah, not the same thing, but are the other 2 worth 4x as much?

Add a few hundred dollars more and you can purchase a brand new ProCaster.

From a strictly functional point of view, those sales don't make sense.  But when it comes to just wanting something, money tends to burn a hole in your pocket.


 
Posted : 19/10/2025 9:01 am
RichPowers
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Posted by: @artisan-radio
↑

I thought both prices were silly stupid.

Consider.  You can purchase a Cuthbert C-QUAM kit for about half those prices.  .. .. a Talking House for about 1/4 that price.  Yeah, not the same thing, but are the other 2 worth 4x as much? Add a few hundred dollars more and you can purchase a brand new ProCaster. From a strictly functional point of view, those sales don't make sense.  ...

Yes, a Culbert C-Quam is $189, or his standard AM xmitter is $169, but those are KITS, it takes a some know-how and time to assemble before it can be used, and if your not experienced in soldering and so forth, then it's probably better to have some one build it for you- in which case there's labor to be paid... Also you would still need a processor, that's even more expense to factor in. So that $189 price tag will ultimately double before you ever make the first broadcast.

I don't think it's really comparable.

The SStrans above were fully assembled tested and ready to go AND they include an adjustable audio processors built right into the unit, AND have established a rather epic reputation to boot. AND it's the only Class E Transmitters to be found. So perhaps $400 for the  AMT5000 was actually a decent deal. We don't know how much the accepted offer was for AMT3000, it might have been only $100 or $150 or it might have been $300, we don't know.

As for comparing it to the Talking House (which also do not have a built in processing and tend to be known for less than quality audio.. well I don't know, but I think it's safe to say the SStrans are a better transmitter.

But, all that said, I tend to agree, if I needed an AM transmitter, I would have passed on the SSTrans at those prices and spend a little more for a certified Procaster unit.

 


 
Posted : 19/10/2025 11:07 am
Mark
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I believe that Sean Cuthbert has some compression incorporated in his AM transmitter....from ebay....

PLL drift free transmitter with memory. No expensive crystals to buy. Just set the frequency and it stays there rock solid.
Built in audio compressor to keep volume constant and prevent over modulation. 

But his kits not being on a printed board with components numbered and marked would not be for someone with out some know how as pointed out. The SStran in kit form would be way easier to build.
But I guess they went for that price by someone who was familiar with it and was built already so maybe worth more considering than the kit was new.


 
Posted : 19/10/2025 3:28 pm
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