[NJARC] $5 FM Radio Station

[Al Klase]

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 
<https://www.ebay.com/itm/DSP-PLL-87-108MHz-Digital-Wireless-Microphone-Stereo-FM-Transmitter-Module-Board/272315699393?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649>

There is some almost understandable tech info HERE 
<https://beststore-online.com/item?id=44889424658&vendorId=789815333>

*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/

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