[Milsurplus] RBA RBB RBC receiver multicoupler

[Al Klase]

On 12/17/2018 2:05 AM, Jim Whartenby wrote:
> .... Perhaps Al Klase can comment on this?  He has done a lot of work 
> on MF and HF antenna systems using home made splitters.  See: 
> http://www.skywaves.ar88.net/ANTENNA/antsys.htm
Thanks Jim,

I've been meaning to weigh in on this thread.

I think the video distribution amp is a bad bet, especially if you have 
strong local signals.

The switch is the simplest solution beyond just feeding all three RX's 
from the same wire.   No loss, No imtermods.

I like splitters.  TV/Cable splitters generally aren't much good below 
about 5 MHz.  You can buy proper splitters from Mini Circuits but 
they're expensive.
Splitters are easy to make, and the same binocular cores and wires can 
be used to make other useful MAGNETIC COMPONENTS 
<http://www.skywaves.ar88.net/ANTENNA/N3FRQ_Baluns.pdf>.
So, order up a dozen BN-73-202's and some #26 low-temp magnet wire from 
Amidon. <http://www.amidoncorp.com/bn-73-202/>

For Jeff's application, I'd make two two-way splitters, and feed the HF 
set from the first unit (-3db), and the LF and MF radios from the second 
cascaded splitter (-6dB).  Those losses are going to be barely 
noticeable given the background noise at these frequencies.

My dissertation on antenna distribution systems is HERE 
<http://www.skywaves.ar88.net/ANTENNA/antsys.htm#Splitter>.

Have fun,
Al
>
>
> ------------------------------------------------------------------------
> *From:* Bob kb8tq <kb8tq at n1k.org>
> *To:* JEFF CICCONE <kg2bz at comcast.net>
> *Cc:* Military Surplus Mail List <milsurplus at mailman.qth.net>
> *Sent:* Sunday, December 16, 2018 3:25 PM
> *Subject:* Re: [Milsurplus] RBA RBB RBC receiver multicoupler
>
> Hi
>
> A 30 db noise figure is considered “pretty quiet” in terms of a video 
> distribution
> amplifier. That’s not to say that they all have that sort of noise, 
> but that the one
> you get could easily be that noisy. In terms of getting to the sort of 
> 6 db or so
> NF you probably would want in an antenna distribution setup …. look 
> elsewhere.
>
> A 4 way power splitter should be pretty easy to find with 6db loss per 
> port. That
> would likely do better for a coupler than one of the video gizmos and 
> would be
> at least as cheap.
>
> Bob
>
>> On Dec 16, 2018, at 3:51 PM, JEFF CICCONE <kg2bz at comcast.net 
>> <mailto:kg2bz at comcast.net>> wrote:
>>
> Folks
> I have been fortunate to have this nice receiver lineup however I am 
> using an 3 position antenna switch to make the connection from my rf 
> bnc antenna patch panel
>
> I saw an article written by a british ham about using an Extron DA2 
> RGBHV wideband video distribution amp in lieu of rf multicouplers for 
> my 3 navy receivers
>
> http://gm1sxx.blogspot.com/2018/01/the-poor-mans-receiver-multicoupler.html
>
>  Has anyone tried this ?   Those units are always on ebay and are 
> inexpensive. I wonder how well they handle weak signals, nearby 
> transmitters, IMD etc? I oredered one and will let everyone know how 
> it performs
>
> What about using Extron Ultra-Wideband Matrix Switchers for RGB and 
> Stereo Audio as a crossbar switch to route and select multiple 
> receivers to multiple antennas?  I realize they cannot be used for 
> transmitting.
>
> By the way I echo the comments about the magnificent beast RBC.  Its 
> smooth tuning , its squelch/silencer and noise limiter circuits really 
> work. The audio filter in the sharp mode is great for crowded CW signals.
>
> Jeff KG2BZ
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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