[Premium-Rx] Receive Multicoupler

Wed Mar 25 08:17:27 EDT 2009

Paul

> This might be a major issue with weak signals on quiet bands.

Noise figure of 10dB min Typical  9 dB

Thermal noise in 1Hz is -174dBm
Add 10xlog(BW) = 10xlog(1000) = 30dB
Add Noise figure = 10dB

So -174+30+10 =   -134dBm  1KHz Bandwidth (BW)

The Multicouplers are designed to work on large rhombic antenna farms
with The antenna providing some gain


On 25 Mar 2009, at 08:38, Clemens Paul wrote:

>> Input IP3  min  +42dBm typical  > +43 dBm
>> Input IP2  min  +90dBm  typical > +100dBm
>
> These are real excellent numbers,particularly the IP2
> which is often underestimated in its importance.
> For use in central europe this is a must.
>
>> Noise figure of 10dB  min
>
> As the gain is 0dB this would mean a loss in system (rx + coupler)  
> sensitivity of 10dB
> as 10dB noise are added to the received signal.
> This might be a major issue with weak signals on quiet bands.
> Is it really 10dB?
>
> 73
> Clemens
> DL4RAJ
>
>
> ----- Original Message -----
> From: "Nick Vafiadis" <nick.v at commsaudit.com>
> To: <premium-rx at mailman.qth.net>
> Sent: Tuesday, March 24, 2009 11:29 PM
> Subject: Re: [Premium-Rx] Receive Multicoupler
>
>
> For  Receive Multicoupler  CA3035B 1 Input 8 Outputs
>
> Noise figure of 10dB  min
> Input IP3  min  +42dBm typical  > +43 dBm
> Input IP2  min  +90dBm  typical > +100dBm
> Gain 0dB ± 1.5dB
>
> We some times have second hand  that we put on the market
>
> Nick Vafiadis
> www.commsaudit.com
>
> On 24 Mar 2009, at 19:44, Warren Ziegler wrote:
>
>>
>>
>>
>> Hi Steve,
>>
>>      Thanks for the info, I did check out the Stridsberg units but
>> the IP2 and IP3 are at least 10dBm less than the RF Tech coupler.
>> I'm afraid I live in such a heavily rf polluted environment that the
>> Stridsberg's won't hold up.
>>
>> 73 Warren K2ORS
>>
>>
>>
>> ----- Original Message ----
>>> From: Stephen Cannon <sugar_bears_home at yahoo.com>
>>> To: premium-rx at mailman.qth.net
>>> Cc: Warren Ziegler <ny2h at yahoo.com>
>>> Sent: Monday, March 23, 2009 9:08:01 PM
>>> Subject: RE: [Premium-Rx] Receive Multicoupler
>>>
>>> Warren,
>>> I use a Stridsberg Engineering Receiver Multicoupler.  They do make/
>>> sell
>>> Passive Multicouplers in the 100 kHz to 500 MHz range (models MC102
>>> and
>>> MC104). http://www.stridsberg.com/prod01.htm
>>>
>>> Common Specifications - PASSIVE
>>> Nominal Impedance:  50 Ohms
>>> Port-To-Port Isolation:  22 dB (min)
>>>                        25 dB (typical)
>>> Phase (input/output):  Zero degree
>>> Coupler Gain/Loss:  -3.5dB (MC102/202)
>>>                :  -7dB   (MC104/204)
>>> Case:  Die-cast aluminum, black powder coat
>>> Mechanical:  4-3/8 x 2-3/8 x 1-1/4 Inches (L W H)
>>>
>>> Options: TNC connectors -
>>>
>>> The MCA104M HF Receiver Multicoupler I use is a 4 port Active
>>> Multicoupler
>>> that covers - 500 kHz to 50 MHz.  Take a look at the data sheet at
>>> http://www.stridsberg.com/mca104a.htm.  Stridsberg also makes a 2
>>> port and
>>> an 8 port version of this same Multicoupler, another series for the
>>> VHF/UHF
>>> range, and another one for 800 MHz Service band Monitoring.  The
>>> product I
>>> received was (in my opinion) a first class piece of equipment (much
>>> better
>>> than the pictures).
>>>
>>> Additional questions on Stridsberg Engineering products can be
>>> answered by
>>> email to stridsberg at bellsouth.net or phone (313)861-0660
>>> (Shreveport, LA).
>>> I am not associated with them other than as a satisfied user of  
>>> their
>>> products.
>>>
>>>
>>> Stephen AD7TD
>>>
>>> -----Original Message-----
>>> From: premium-rx-bounces at mailman.qth.net
>>> [mailto:premium-rx-bounces at mailman.qth.net] On Behalf Of Warren
>>> Ziegler
>>> Sent: Monday, March 23, 2009 12:21 PM
>>> To: premium-rx at mailman.qth.net
>>> Subject: [Premium-Rx] Receive Multicoupler
>>>
>>>
>>> Hello the list...
>>>  Anyone know of a good rf receive multicoupler for 100kHz to at
>>> least
>>> 30MHz?
>>> High IP2 and IP3 is important since I live near several 50kW MW BC
>>> stations.
>>>
>>> Thanks & 73
>>> Warren K2ORS (formerly NY2H)
>>>
>>>
>>>
>>> ______________________________________________________________
>>> Premium-Rx mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
>>> Help Page: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Premium-Rx at mailman.qth.net
>>> Help Contact eMail:  paul at 8zo.com
>>> Home Page:  http://www.premium-rx.org/
>>
>>
>>
>>
>> ______________________________________________________________
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>> Help Contact eMail:  paul at 8zo.com
>> Home Page:  http://www.premium-rx.org/
>
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