[NJARC] NJARC Digest, Vol 163, Issue 18

Tue Nov 28 23:19:07 EST 2017

Question for yah, How is the quality of the audio?  
Tnxs, Warren  KD2NIX

On Nov 28, 2017, at 9:04 PM, njarc-request at mailman.qth.net wrote:

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> _______________________________________________
> Today's Topics:
> 
>   1. Re: $5 FM Radio Station (Sal Brisindi)
>   2. FM Station Progress (Al Klase)
> 
> From: Sal Brisindi <salb203 at aol.com>
> Subject: Re: [NJARC] $5 FM Radio Station
> Date: November 28, 2017 at 2:12:57 PM EST
> To: "ark at ar88 net" <ark at ar88.net>, "njarc at mailman qth. net" <njarc at mailman.qth.net>
> 
> 
> Al,
> Order me a case of 10... Only kidding, I already ordered one last night...
> 
> Sal
> 
> 
> 
> On November 28, 2017, at 12:50 PM, Al Klase <ark at ar88.net> wrote:
> 
> 
> Bill and The Gang,
> 
> I was mostly trying to stimulate discussion, not go into business.  I guess a group buy might be possible, but would have to be a couple of buck more to cover inevitable  left overs.   Might also get some micro-USB and 3.5mm to 3.5mm stereo cables if folks don't have them.  Feedback needed!
> 
> The unit I have is: HERE
> 
> There is some almost understandable tech info HERE
> 
> Problems so far:
> 
> No convenient way to mount the sucker.  I think I'll hot-melt glue it to something.
> Hard to get sufficient drive to achieve full modulation from some mobile devices.
> Need to monitor off the air to set up input level.
> 
> Bill;
> 
> Frequency response (pre-emphasis) seem to be OK.  There is a switchable option supporting two frequency ranges, and I suspect they switch pre-emphasis accordingly.
> 
> In Chinglish: Closed campus radio87.0MHz-108.0MHz, open campus radio76.0MHz-108.0MHz
> 
> The 76 MHZ is the Japanese standard.  That should be 50uS preemp.
> 
> What else?
> 
> Al
> 
> 
> On 11/28/2017 10:00 AM, William S Zukowski wrote:
>> Just remember
>> Reply = Poster
>> Reply All = Everyone
>> 
>> _________________________________________________________
>> 
>> 
>> All of the lower priced FM transmitters I've seen are set for 50 us pre-emphasis, not 75 as used in this country resulting is a loss of highs.  Depending on your requirements, this may not be an issue.
>> 
>> I purchased two low power FM transmitters for re-broadcasting XM and the music channel from my cable TV around the house.  Turning up the treble on the receive end helps, but I'd still like to be able to reset the pre-emphasis.  With my two transmitters, this is not easily accomplished.
>> 
>> A "Pause" button on a FM transmitter??
>> 
>> All that being said, if you're putting together a bulk order, I'll go for one too.  Can never have too much stuff!  Thaks AL.
>> 
>> Bill
>> 
>> 
>> 
>> On 11/27/2017 7:33 PM, Al Klase wrote:
>>> Just remember
>>> Reply = Poster
>>> Reply All = Everyone
>>> 
>>> _________________________________________________________
>>> 
>>> 
>>> Gang,
>>> 
>>> I've been frustrated by the comparatively poor performance of tube-based FM radios for a long time.  This is especially true in fringe areas, like the Museum.   The Atlantic Highlands lie between us and the Empire State building, about a 50 mile path.  Our Fisher Model 90 on a 4-element Yagi is just starting to hear WBGO acceptably, now that the leaves are coming off the trees.  So I want to provide a local signal with appropriate programming.
>>> 
>>> Found these on E-bay:
>>> 
>>> ----------PAUSE??
>>> 
>>> 2 inches wide.
>>> 
>>> About 30 mW out., stereo,  pretty much broadcast quality, covers the house will with a 25-inch whip, runs off a PC or mobile device with on a single USB connection for audio and power.
>>> 
>>> There are some tricks.
>>> 
>>> Let me know if you're interested, and I'll write some of this stuff up.
>>> 
>>> Otherwise, I understand.
>>> 
>>> Regards,
>>> Al
>>> -- 
>>> Al Klase – N3FRQ
>>> Jersey City, NJ
>>> http://www.skywaves.ar88.net/
>>> 
>>> 
>>> 
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>> 
>> 
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> 
> -- 
> Al Klase – N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
> 
> 
> 
> 
> From: Al Klase <ark at ar88.net>
> Subject: [NJARC] FM Station Progress
> Date: November 28, 2017 at 9:04:16 PM EST
> To: NJARC at MAILMAN.QTH.NET
> 
> 
> FM Followers,
> 
> I hot-glued the transmitter to a piece of perf board:
> 
> <glued lo-res.jpg>
> 
> Mounted it in a Pomona box that surely cost 3 or 4 times as much as the TX:
> 
> <In Box lo-res.jpg>
> 
> Power and audio via USB from my office PC.
> 
> Hooked it to my homebrew disk-cone antenna in the attic.  (aprox. 100 feet of coax.)  Quick survey showed it covers the neighborhood for about 100 yards before co-channel interference from WRHU, in Hempstead, 25 miles, 500 watts, takes over.
> 
> I'm declaring this a success.
> 
> Al
> -- 
> Al Klase – N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
> 
> 
> 
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