I have to give credit when I see such beautiful work.
http://www.ebay.com/itm/AM-BROADCASTER- ... 1eb2f58009

Yes, nicely done, but my eyes go to the extra washers/spacers on the transformer.

LOL... Listing says 40 sold, by this time you'd think he'd have it right

Not that there is anything wrong with project boxes, they just ain't my style... After looking at the prototype 12AV6/12CS6 xmitter I built for a few weeks, I gave it away...


Tom

I was in reference to the circuit wiring.
This guy is an artist.

Like I said, you build 40 of the same thing, it should be neat...

That is an extra nut, green in color......to connect the unit to earth ground. Helps in establishing a good xmit signal. An old fellow in our church bought one for his radios - all tabletop Emersons with the Ingraham cabinet maker name. His kin made the cabinets.

He jokes he's the only living "silent key" - he gave up Ham Radio a dozen years ago.....for travel, all funded by the sale of his "shack."

Makes sense. A ground symbol would make it prettier.

So, how can he sell assembled transmitters? FCC rules have previously been discussed on ARF that prohibit selling a functional, assembled unit which has not been type approved by the FCC. That process costs tens of thousands of dollars. No mention is made of this unit meeting any such legal requirements so we can only assume it does not.

because the FCC has no clue about it ...and it's such small potatoes... who really cares?

Wasn't there a thread about someone else who got caught selling assembled units and had to pay an enormous fine, awhile back?
Regardless though, I believe we have previously discussed the situation wherein the FCC will normally only investigate a complaint -about non-legal transmission- made by a commercial radio station.

Ramsey Electronics of kit fame sold a completed AM Transmitter - in assembled and kit form. I bought the kit, along with their BA1404-based FM Stereo Transmitter back in 1995. I still have the FM transmitter - the AM one would drift after 20 minutes or so. All NP0 caps, and still drifted. Panaxis also sold assembled transmitters, both OTA (for export) and carrier-current.
I'm ignorant to the FCC rules - we used a Panaxis FM transmitter kit to broadcast our church service from the sanctuary to the ladies in the nursery 300 feet away, probably breaking a few FCC rules every Sunday.

As I recall, someone reported that guy to the FCC, and so they investigated. It could also have been a manufacturer of a certified product that reported him.

Seems there was some discussion a while back about whether a tube unit without the tubes plugged in was an "assembled unit." Now I'm curious, would this seller be in the clear if they didn't provide the tubes and left it up the buyer to get them elsewhere?

Ramsey Electronics has been raided by the feds:

Ramsey Electronics of Victor, New York was raided on November 10, 1999 by the United State Customs Service. They had a search warrant stating that they we manufacturing and distributing electronic and surreptutitous intercept devices which are illegal according to Title 18 USC, Section 2512.

http://www.mediageek.net/2006/01/micro- ... ed-by-fcc/



No law against selling kits, but assembling SStran kits for others has gotten one our members a $10,000 fine....

http://www.part15.us/forum/part15-forum ... -assembler

If RangeMaster filed a complaint, that eBay seller might get a rude surprise.

And not installing a tube isn't going to make fly as a kit.

Pete

The guy selling these transmitters is a total AS* HOLE I asked him a question about his transmitter one time and the guy came unglued called me names I won't repeat here maybe he was drunk or high on something? He accused me of wanting to steal his design, and I guess under sell him not sure what his concern was so no way would I give this guy any of my money. Buyer beware and good luck with support if you have problems with your purchase.

Really? If he was that concerned over someone stealing his design, then why did he put a picture of the underside of his transmitter in his listing? Given enough time I could easily trace it and draw out a schematic.

He he

I've seen enough that I'm fairly convinced it's using a 12CS6 mixer/osc modulated by a 12AU6.. Output of 12CS6 is amplified by the 50C5 power output... Oh yeah, it uses a rectifier dropper to lower voltage for the 75v series string... Probably has a resistor that's dropping the additional 12v...

We were building 12AV6/12CS6 Tx here on ARF six or seven years ago... Setup properly a extra power output isn't necessary...


Tom

At the time there was no picture on his Ebay account from what I can remember. Are you the seller?

Would you have a link to that thread, and did it contain a schematic?

Likewise. I first saw that transmitter at least a year ago, and I traced the circuit from the photo far enough to see that there was nothing special about it. He probably needs the extra power output because there's nothing in the circuit for tuning the antenna.