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WTB : LPAM Part 15 Transmitter BCB
I am looking to buy a synthesized low power AM BCB transmitter for around
the house . Homebrew ok. Please state brand , condition , price . Thanks , Charlie , W5COV |
WTB : LPAM Part 15 Transmitter BCB
On Aug 25, 7:30*pm, "KC0EH" wrote:
I am looking to buy a synthesized low power AM BCB transmitter for around the house . Homebrew ok. Please state brand , condition , price . Thanks , Charlie , W5COV For the money, and if you can get to Kutztown, I will have a consignment of SSTRAN AMT3000 units. $80, including all taxes and with the SMT chip already installed. www.sstran.com for additional information. Phil is a neighbor and give a very good price for the show as a courtesy to the DVHRC. We choose not to mark them up as a courtesy to attendees. We recently moved into a 4200 s.f. house (grandkids and all that), the transmitter more than covers it and gets our nearest neighbors and then some with just the kit-supplied wire antenna. Do a search on this NG, you will get all sorts of additional information on this and many other transmitters. Peter Wieck Melrose Park, PA |
LPAM Part 15 Transmitter BCB
"KC0EH" wrote in message
... I am looking to buy a synthesized low power AM BCB transmitter for around the house . Homebrew ok. Please state brand , condition , price . Thanks , Charlie , W5COV In case you don't get any bites on anything more to your liking, Ramsey has a kit at http://www.ramseyelectronics.com/cgi...ction&key=AM25. I have one, and have used it for the past 3 years with no problems. The only thing I can suggest if you settle for this unit is to scrap the supplied wall wart and get a regulated, filtered 12-15V power supply. It solves a problem with hum and distortion that the supplied power supply causes. Ramsey has known about this problem for a long time... don't know if they still ship the kit with the bad PSU. Download the manual from their site to get an idea of the complexity of the kit. Cheers!!!! -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer it gets to the end, the faster it goes. |
WTB : LPAM Part 15 Transmitter BCB
Peter Wieck a écrit :
For the money, and if you can get to Kutztown, I will have a consignment of SSTRAN AMT3000 units. $80, including all taxes and with the SMT chip already installed. Peter, That transmitter is NOT FCC part 15 compliant for what I know. This would be misleading as the OP requests a part 15 transmitter BCB. Syls |
WTB : LPAM Part 15 Transmitter BCB
"Syl" wrote in message ... Peter Wieck a écrit : For the money, and if you can get to Kutztown, I will have a consignment of SSTRAN AMT3000 units. $80, including all taxes and with the SMT chip already installed. Peter, That transmitter is NOT FCC part 15 compliant for what I know. This would be misleading as the OP requests a part 15 transmitter BCB. Syls Syl I believe it meets the FCC regs regarding "homemade" Part 15 devices; and would be limited to the maximum number of units allowed per individual--five, if I recall correctly. Pete |
WTB : LPAM Part 15 Transmitter BCB
Tio Pedro a écrit :
Syl I believe it meets the FCC regs regarding "homemade" Part 15 devices; and would be limited to the maximum number of units allowed per individual--five, if I recall correctly. Pete Dear Senor Pedro, That "part" is unclear to me. I try to understand what makes a transmitter Part 15 compliant when homemade as opposed to a commercial unit. Does the 100mw input still holds (but owner/builder doesn't have to get "approved" by FCC) or is it a don't get caught transmitting on a commercial frequency -i.e. create interferences- and you'll do fine thing ? Syl |
WTB : LPAM Part 15 Transmitter BCB
On Aug 26, 6:10*pm, Syl wrote:
Peter Wieck a écrit : For the money, and if you can get to Kutztown, I will have a consignment of SSTRAN AMT3000 units. $80, including all taxes and with the SMT chip already installed. Peter, That transmitter is NOT FCC part 15 compliant for what I know. This would be misleading as the OP requests a part 15 transmitter BCB. Syls From the website: · Legal to use in the US, no FCC license required · Fully compliant with FCC Part 15 regulations · 100 mW input power · 100% Modulation · 20Hz to 20kHz ±1 dB Audio Response · Very Low Distortion · Adjustable Audio Compressor/Limiter · 10 kHz and 9 kHz channel spacing options · High Quality PC Board and Components · Comprehensive Instruction Manual This is a "HOME MADE" unit - which means that it must meet maximum power radiation requirements, antenna developed length requirements and various other regulations. EXACTLY the same as the Ramsey kit, the AES kit, the L'il 7 Kit and any of several others. What it is NOT is approved to be sold as a full-built unit. Makes it Part 15 - compliant. But, by removing the spaces, you can get chapter-and-verse from Phil Bolyn at info at sstran dot com. Peter Wieck Melrose Park, PA |
WTB : LPAM Part 15 Transmitter BCB
In article , Syl
wrote: Tio Pedro a écrit : Syl I believe it meets the FCC regs regarding "homemade" Part 15 devices; and would be limited to the maximum number of units allowed per individual--five, if I recall correctly. Pete Dear Senor Pedro, That "part" is unclear to me. I try to understand what makes a transmitter Part 15 compliant when homemade as opposed to a commercial unit. Does the 100mw input still holds (but owner/builder doesn't have to get "approved" by FCC) or is it a don't get caught transmitting on a commercial frequency -i.e. create interferences- and you'll do fine thing ? I would have to check the CFR to be sure, but IIRC building a homemade Part 15 compliant transmitter doesn't absolve you from the basic requirements for operation in the MW broadcast band like keeping the DC input power to the final below 100 mW and the length of the antenna/ground system to 3 meters or less, I think homemade status only eliminates the need to do the more complex certification tests necessary for commercial units. I also suspect that if you are using a Part 15 transmitter, either homemade or commercial, and it interferes with a commercial frequency, then it is your responsibility to resolve the interference problem, or shut the transmitter down, I don't think commercial units get any special privileges in this regard, although again I would have to check the CFR to be sure. -- Regards, John Byrns Surf my web pages at, http://fmamradios.com/ |
WTB : LPAM Part 15 Transmitter BCB
In article ,
Peter Wieck wrote: On Aug 26, 6:10*pm, Syl wrote: Peter Wieck a écrit : For the money, and if you can get to Kutztown, I will have a consignment of SSTRAN AMT3000 units. $80, including all taxes and with the SMT chip already installed. Peter, That transmitter is NOT FCC part 15 compliant for what I know. This would be misleading as the OP requests a part 15 transmitter BCB. From the website: · Legal to use in the US, no FCC license required · Fully compliant with FCC Part 15 regulations · 100 mW input power · 100% Modulation · 20Hz to 20kHz ±1 dB Audio Response · Very Low Distortion · Adjustable Audio Compressor/Limiter This is a misleading statement, the SSTRAN AMT3000 does not include a limiter, manufacturers claims not withstanding. A traditional limiter as used with AM transmitters controls the modulation peaks, either by a clipping operation, or with a high speed peak activated AGC amplifier, the SSTRAN AMT3000 includes neither of these circuits. The so called "Compressor/Limiter" used in the SSTRAN AMT3000 is an RMS controlled AGC amplifier with a knee in its compression curve. The RMS control means that it doesn't pay any attention to the peak levels that cause over modulation. SSTRAN calls it a "Limiter" because of the knee in the compression curve, but it fails to operate as expected of a limiter to prevent over modulation. -- Regards, John Byrns Surf my web pages at, http://fmamradios.com/ |
WTB : LPAM Part 15 Transmitter BCB
"Syl" wrote in message ... Tio Pedro a écrit : Dear Senor Pedro, That "part" is unclear to me. I try to understand what makes a transmitter Part 15 compliant when homemade as opposed to a commercial unit. Does the 100mw input still holds (but owner/builder doesn't have to get "approved" by FCC) or is it a don't get caught transmitting on a commercial frequency -i.e. create interferences- and you'll do fine thing ? Syl Mon Ami I tried googling the FCC website, but not much luck... There is (was) a section that mentioned that it was legal to build a part 15 transmitter, provided it meet the FCC requirements for regarding power, antenna limitations and spectral purity. There was a limit on the number of such devices that could be built and owned by individual as well. Pete |
WTB : LPAM Part 15 Transmitter BCB
Peter Wieck a écrit :
On Aug 26, 6:10 pm, Syl wrote: Peter Wieck a écrit : For the money, and if you can get to Kutztown, I will have a consignment of SSTRAN AMT3000 units. $80, including all taxes and with the SMT chip already installed. Peter, That transmitter is NOT FCC part 15 compliant for what I know. This would be misleading as the OP requests a part 15 transmitter BCB. Syls From the website: · Legal to use in the US, no FCC license required · Fully compliant with FCC Part 15 regulations · 100 mW input power · 100% Modulation · 20Hz to 20kHz ±1 dB Audio Response · Very Low Distortion · Adjustable Audio Compressor/Limiter · 10 kHz and 9 kHz channel spacing options · High Quality PC Board and Components · Comprehensive Instruction Manual This is a "HOME MADE" unit - which means that it must meet maximum power radiation requirements, antenna developed length requirements and various other regulations. EXACTLY the same as the Ramsey kit, the AES kit, the L'il 7 Kit and any of several others. What it is NOT is approved to be sold as a full-built unit. Makes it Part 15 - compliant. But, by removing the spaces, you can get chapter-and-verse from Phil Bolyn at info at sstran dot com. Peter Wieck Melrose Park, PA Hi Peter, Thanks. Several of those specs do bring questions though as they aren't properly defined (unless they are in the full FCC documentation ? i.e. a) Just what "very low distortion" means ? To me, very low distortion would be 0,001% as a minimum. But I understand that in the real world of transmitters, 0,1% is probably considered very low distortion figures ? This based on the presumption that attaining 0,001% distortion figures is easier to attain than using tube technology. Correct me if I am wrong. b) Adjustable compressor/limiter. To what levels ? c) High Quality PC Board and Components. Does this means the homebrewer can't use Chinese made parts [grin] Of course I do not mean to start a discussion on these points, merely thinking out loud...;o) But...I now better understand the requirements for part 15. As It shows, the only difference between a commercial unit and a homebrewer's is the latter does not have to pay labs testing and approval for his "concoction" whereas the former (the manufacturer) has to have the FCC seal of approval and the of course the onerous fee(s) along with the approval tag. I wonder how the FCC manages the homebrewer's "concoctions", other than reacting to complaint(s) ? I suspect this is what happened to the kit builder whom got fined sometime ago ? Syl |
WTB : LPAM Part 15 Transmitter BCB
I wonder how the FCC manages the homebrewer's "concoctions", other
than reacting to complaint(s) ? I suspect this is what happened to the kit builder whom got fined sometime ago ? They basically respond to complaints, as I recall. It's a common-sense sort of rule. You can transmit at a power level that covers your house, or your yard at best. You can't go above that level without possibly interfering with your neighbors' reception. Duh. I'm not interested in building a pirate radio station, so I can't imagine why I'd want a transmitter that could broadcast beyond our house. I dimly recall discussions about that kit builder, but it seems he was selling manufactured units as "kits," or possibly selling non-compliant manufactured units without going through the certification process. If you're simply piddling around in the basement and trying to build a house-level transmitter, there is no certification process. Just don't interfere with reception in your neighbors' houses, lest they complain. Common sense rules :-) Phil Nelson |
WTB : LPAM Part 15 Transmitter BCB
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WTB : LPAM Part 15 Transmitter BCB
Forgive the top posting - note the interpolations.
On Aug 26, 10:43*pm, Syl wrote: Thanks. Several of those specs do bring questions though as they aren't properly defined (unless they are in the full FCC documentation ? Well, not really - what the FCC requires is apart from many of the specifications shown. Example: US Federal requirements on automobiles write to certain requirements - leather seats is not one of them. Part 15 writes to certain requirements - Accepting stereo inputs, broadcasting 20hz - 20khz, and very low distortion are not amongst them. They are the leather seats. a) Just what "very low distortion" means ? To me, very low distortion would be 0,001% as a minimum. But I understand that in the real world of transmitters, 0,1% is probably considered very low distortion figures ? This based on the presumption that attaining 0,001% distortion figures is easier to attain than using tube technology. Correct me if I am wrong. In the specifications - which you have to dig further into the site to find. However from my discussions with Phil, that VLD is relative to most commercial broadcasters and also a function of the much broader bandwidth. b) Adjustable compressor/limiter. To what levels ? Also in the specifications. c) High Quality PC Board and Components. Does this means the homebrewer can't use Chinese made parts [grin] I am not so sure how to answer that question. I have seen homebrewers use the functional equivalent of Venusian water buffalo poop in their rigs - as long as it meets the radiation requirements of Part 15, I am not so sure the Feds will care. Phil sources his parts from all over the place - but many of the custom parts are made locally - not in China. Of course I do not mean to start a discussion on these points, merely thinking out loud...;o) You mean that you are not taking a page from Mr. Byrns' book and attempting to poison the waters around what should be a pretty simple discussion? ;-{ 0 But...I now better understand the requirements for part 15. As It shows, the only difference between a commercial unit and a homebrewer's is the latter does not have to pay labs testing and approval for his "concoction" whereas the former (the manufacturer) has to have the FCC seal of approval and the of course the onerous fee(s) along with the approval tag. Something like that. I wonder how the FCC manages the homebrewer's "concoctions", other than reacting to complaint(s) ? I suspect this is what happened to the kit builder whom got fined sometime ago ? Basically, the FCC (as it is presently constituted) is a dumping ground for political hacks owed a small favor and the sons of wealthy political hacks owed a larger favor. There is not a scintilla of competence throughout its political-appointee management and hasn't been for perhaps the last 6 - 20 years (maybe much longer), depending on whose ox was gored most recently. For the most part, its regulations are written so vaguely that the adage "Money talks, the rest walks" covers their behavior. The individual who was assembling SSTRANs for resale got fined by the FCC because a competitor selling a fully-assembled product WITH the FCC compliance certificate at over 10X the cost felt threatened and injured - and had the money and was paying the fees to get action. It is interesting to note that said kit-builder is back and has done the thing he should have done in the first place to be in full compliance with Part 15 (not sell assembled transmitters) yet still perform the service for his customers - so simple and so obvious that he missed it for years and was fined. He is now bullet-proof in that sense. Care to guess how he is doing it? Put it this way, every single solitary AM transmitter *KIT* sold in the United States today for single-house use from Vectronics to Ramsey to SSTRAN to the L'il 7 et.al. that calls itself "Part 15 compliant" is subject to the same regulations. It is my opinion based on my experience with most of them that the SSTRAN happens to be the most convenient unit to use and short of a parts-box home-brew represents the best value-for-money in addition to its convenience. That Phil is a distant neighbor and a decent guy does not change any of that. As the "other" Phil notes, the FCC reacts to complaints. If the complainer is of the party-in-power and also has money may affect the speed and effectiveness of their response - though not necessarily. Peter Wieck Melrose Park, PA |
WTB : LPAM Part 15 Transmitter BCB
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WTB : LPAM Part 15 Transmitter BCB
Peter Wieck a écrit :
Of course I do not mean to start a discussion on these points, merely thinking out loud...;o) You mean that you are not taking a page from Mr. Byrns' book and attempting to poison the waters around what should be a pretty simple discussion? ;-{ 0 I knew someone would catch this one... It is interesting to note that said kit-builder is back and has done the thing he should have done in the first place to be in full compliance with Part 15 (not sell assembled transmitters) yet still perform the service for his customers - so simple and so obvious that he missed it for years and was fined. He is now bullet-proof in that sense. Care to guess how he is doing it? Dunno how he does it but the way "I" would do it is build the kit for free and get the customers to pay for an irrelevant item (say a label) for the whole cost I would charge building the kit, or better yet, have the customer install a few parts by themselves and send the kit in for repair 'cause it doesn't work... Much like those selling pirated CDs from well known "free movies" archives and not charge for the actual CD content but for the labour and material cost... Syl |
WTB : LPAM Part 15 Transmitter BCB
Tio Pedro wrote: "Syl" wrote in message ... Tio Pedro a écrit : Dear Senor Pedro, That "part" is unclear to me. I try to understand what makes a transmitter Part 15 compliant when homemade as opposed to a commercial unit. Does the 100mw input still holds (but owner/builder doesn't have to get "approved" by FCC) or is it a don't get caught transmitting on a commercial frequency -i.e. create interferences- and you'll do fine thing ? Syl Mon Ami I tried googling the FCC website, but not much luck... There is (was) a section that mentioned that it was legal to build a part 15 transmitter, provided it meet the FCC requirements for regarding power, antenna limitations and spectral purity. There was a limit on the number of such devices that could be built and owned by individual as well. Pete You want to wade through CFR 47, part 15. That has the laws the FCC is supposed to enforce. -- http://improve-usenet.org/index.html aioe.org, Goggle Groups, and Web TV users must request to be white listed, or I will not see your messages. If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm There are two kinds of people on this earth: The crazy, and the insane. The first sign of insanity is denying that you're crazy. |
WTB : LPAM Part 15 Transmitter BCB
On Aug 27, 9:13*am, Syl wrote:
have the customer install a few parts by themselves and send the kit in for repair 'cause it doesn't work... Yep.You are on the right track - the kit is built all-but-plugging the chips into the sockets. That is left to the customer and apparently enough to satisfy the regulations. Ah, well. I built mine and I enjoy it nearly every day. I also keep an FM-stereo transmitter so I can feed AM signal to the vintage audio and FM signal to the vintage radios... Hey, does Little Vinny have any currency from the middle east? I could gather a few coins together if you wish? Peter Wieck Melrose Park, PA |
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