|
Post by part15engineer on Jul 8, 2017 20:15:42 GMT
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 8, 2017 22:13:27 GMT
Where Art Thou Rolls?
There's a kind of website that never reveals where the hell it is in the world.
Rolls seems to be one of those websites.
The equipment looks like it has professional features, but I guess technically the FCC rules would not allow its sale in the U.S. given the lack of certification.
But if one of us had the transmitter our responsibility would be to make sure we obeyed 15.239.
Thank you for posting this.
|
|
|
Post by Boomer on Jul 8, 2017 22:49:05 GMT
Looks nice, more classic like real radio equipment and pro than some of the newer desktop transmitters. Odd frequency response, up to 12.5 khz. Down to 20 hz is good though, for bass. That might mean it has a dual loop PLL.
Then again, transmitters seem to put any spec on a transmitter just to look like some numbers are there because you expect them to be, not that it means anything.
Boomer
|
|
|
Post by mark on Jul 8, 2017 23:34:26 GMT
Don't think it would be approved at least here in Canada as it doesn't have a fixed known antenna and power is user adjustable on front. Looks good though and seems to have adjustable compresson and release time.
Mark
|
|
|
Post by mark on Jul 8, 2017 23:44:22 GMT
|
|
|
Post by Boomer on Jul 9, 2017 3:54:54 GMT
When I hear Rolls, I think of a car. I'd call my transmitter model the Bentley, Cadillac or Ferrari are too obvious.
|
|
|
Post by thelegacy on Jul 10, 2017 3:28:06 GMT
Very nice transmitter it does have a 75 ohm output even though it h a BNC connector. One of those BNC to F connector adapters would work quite nicely in this case. This would open up an opportunity to connect it to one of those RadioShack beam antennas Which is less than $40. An antenna like that and beam it in the direction of your audience I would dare say you might make it a mile a mile and a half with an antenna such as that. It does put out 40 ml in his variable so if you want to keep it within part 15 rules you could always turn it down.
Another big plus is the 87.5 megahertz coverage which if we do get the white space coverage it would automatically mean that you could use it down there.
The compressor and limiter makes it for a very nice transmitter that would not over deviate. Kind of like a mini version of the Veronica transmitter. I'm curious as to how much this thing cost?
|
|
|
Post by End80 on Jul 10, 2017 17:00:28 GMT
|
|
|
Post by mark on Jul 10, 2017 23:34:35 GMT
It really looks good and like the on board adjustable compression and release time. Made in USA. I ask too why wouldn't they make it legal? Maybe in the USA keeping the power to legal levels going by the 200 feet distance but in Canada....no go! To bad.
Mark
|
|
|
Post by Druid Hills Radio on Jul 11, 2017 13:33:37 GMT
It really looks good and like the on board adjustable compression and release time. Made in USA. I ask too why wouldn't they make it legal? Maybe in the USA keeping the power to legal levels going by the 200 feet distance but in Canada....no go! To bad. Mark Good question. A search of the FCC database does not reveal a grantee code for Rolls Corporation. To be legit it first could not go to 87. anything. And then there is the issue with 40 mW and a detachable antenna. Limiting the frequency range, padding the output and eliminating the BNC connector would be a good start.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 11, 2017 13:54:30 GMT
Different Class of TransmitterDetails are sketchy because I don't have any but there is another class of transmitter operating under a different section of the rules other than part 15. An example is this Comtek which also has a BNC connector and power level of 50 mW. Comtek BST-25No FCC reference on their website that I can find, except this paragraph from the manual: If you are using this transmitter in a area which does not have a TV station operating on channel 5, you can use one of the channels in the TV 5 range. Conversely, if the area does not have a station on TV 6, you can operate on one of the TV 6 channels. Note: It is unlawful to operate this transmitter in a band that is already occupied by a TV station.
|
|
|
Post by Druid Hills Radio on Jul 11, 2017 14:38:54 GMT
Different Class of TransmitterDetails are sketchy because I don't have any but there is another class of transmitter operating under a different section of the rules other than part 15. An example is this Comtek which also has a BNC connector and power level of 50 mW. Comtek BST-25No FCC reference on their website that I can find, except this paragraph from the manual: If you are using this transmitter in a area which does not have a TV station operating on channel 5, you can use one of the channels in the TV 5 range. Conversely, if the area does not have a station on TV 6, you can operate on one of the TV 6 channels. Note: It is unlawful to operate this transmitter in a band that is already occupied by a TV station. The FCC label is on the rear of the unit. Any transmitter requires certification unless it's homemade.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 11, 2017 15:03:07 GMT
More Info
Druid Hills Radio spotted: "The FCC label is on the rear of the unit."
Sure enough, there it is with FCC ID #.
And I just spotted words on the Tech Sheet: RF Output: 50 mW FCC Part 74.
By the way, we're talking about the Comtek... the Rolls does not appear to have any FCC labeling, but it is technically similar to the Comtek.
|
|
|
Post by Druid Hills Radio on Jul 11, 2017 15:10:43 GMT
More InfoDruid Hills Radio spotted: " The FCC label is on the rear of the unit." Sure enough, there it is with FCC ID #. And I just spotted words on the Tech Sheet: RF Output: 50 mW FCC Part 74. By the way, we're talking about the Comtek... the Rolls does not appear to have any FCC labeling, but it is technically similar to the Comtek. Since the Rolls operation in a matter of speaking is in the FM radio band it would need to be certified under Part 73 & 2 of the Commission's rules.
|
|
|
Post by thelegacy on Jul 12, 2017 3:57:55 GMT
So what is allowed under part 74 of the rules?
|
|