Hi

RCA Y type connectors can send signal only one way. RCA Y type
connectors do carry the frequancy that seismomters send to the amp
board. But you need to make sure that the signal is going to right path
trouth the Y connector.

It might be a better solution for you to use RCA cable with one main
connector with two out connectors. As that is just a simple caple split.

Regards.
J=F3n Fr=EDmann.

On f=F6s, 2009-08-21 at 19:38 -0400, AHrubetz@....... wrote:
> Thanks, Jon.  I am using the standard RCA type connectors and plugs,
> including the Y connector.  I have used the Y connector for many years
> in the past with a split signal to the amp/filter board and to a
> Omniscribe chart recorder with no problems.
> Regards,
> Al
> =20
> In a message dated 8/21/2009 6:18:32 P.M. Central Daylight Time,
> jonfr@......... writes:
>        =20
>         Hello.
>        =20
>         The Y connector most likley does not carry the frequancy that
>         your sensor is sending to the amp board.
>        =20
>         Regards.
>         J=F3n Fr=EDmann.
>        =20
>         On f=F6s, 2009-08-21 at 18:34 -0400, AHrubetz@....... wrote:=20
>        =20
>         > Some months ago I purchased a Geotech Instruments Helicorder
>         > RV-301B with the accompanying amplifier AR-320B.  It works
>         > just fine when I drive it using one channel from one of
>         > Larry's older amp/filter boards.  The input is from a
>         > Lehman-type horizontal detector utilizing a coil with 8k
>         > resistance. (hz1 detector).    =20
>         > I normally have the Lehman hz1 output going into a second,
>         > newer version of Larry's amp/filter A/D boards, and then on
>         > to WinSDR.  =20
>         > Here is my problem:  I want to split the output from hz1
>         > using a Y connector to both the WinSDR display and the
>         > helicorder so I can record analog and digital
>         > simultaneously.  When I do this, the helicorder stylus goes
>         > dead and the CRT display from the amp/filter/AD board
>         > displays rhythmic amplitude spiking.  There appeared to
>         > be an impedance mismatch, so  an EE designed a buffer
>         > amplifier for me with two outputs.  Unfortunately, when
>         > using the buffer amp, the helicorder stylus still is
>         > inoperative and the spiking again shows up on the CRT
>         > display from the amp/filter/AD board, just as before.=20
>         > I am at a loss at what to try next.  The Geotech Instrument
>         > people say they are too busy to give me any advice.  I am
>         > wondering if any of you using the RV301B helicorder has
>         > tried to use a split signal such as I described?  I would
>         > appreciate any suggestions from the PSN family.=20
>         > Thanks and regards,=20
>         > Al Hrubetz=20
>         > Dallas, Texas=20
>         >  =20
>         >=20
>         >=20
>         > ____________________________________________________________
>=20
>=20
> ______________________________________________________________________



  
  


Hi



RCA Y type connectors can send signal only one way. RCA Y type connectors do carry the frequancy that seismomters send to the amp board. But you need to make sure that the signal is going to right path trouth the Y connector.



It might be a better solution for you to use RCA cable with one main connector with two out connectors. As that is just a simple caple split.



Regards.

Jón Frímann.



On fös, 2009-08-21 at 19:38 -0400, AHrubetz@....... wrote:

    Thanks, Jon.  I am using the standard RCA type connectors and plugs, including the Y connector.  I have used the Y connector for many years in the past with a split signal to the amp/filter board and to a Omniscribe chart recorder with no problems.


    Regards,


    Al


     


    In a message dated 8/21/2009 6:18:32 P.M. Central Daylight Time, jonfr@......... writes:


    

        Hello.

        

        The Y connector most likley does not carry the frequancy that your sensor is sending to the amp board.

        

        Regards.

        Jón Frímann.

        

        On fös, 2009-08-21 at 18:34 -0400, AHrubetz@....... wrote: 

        

            Some months ago I purchased a Geotech Instruments Helicorder RV-301B with the accompanying amplifier AR-320B.  It works just fine when I drive it using one channel from one of Larry's older amp/filter boards.  The input is from a Lehman-type horizontal detector utilizing a coil with 8k resistance. (hz1 detector).     

            I normally have the Lehman hz1 output going into a second, newer version of Larry's amp/filter A/D boards, and then on to WinSDR.   

            Here is my problem:  I want to split the output from hz1 using a Y connector to both the WinSDR display and the helicorder so I can record analog and digital simultaneously.  When I do this, the helicorder stylus goes dead and the CRT display from the amp/filter/AD board displays rhythmic amplitude spiking.  There appeared to be an impedance mismatch, so  an EE designed a buffer amplifier for me with two outputs.  Unfortunately, when using the buffer amp, the helicorder stylus still is inoperative and the spiking again shows up on the CRT display from the amp/filter/AD board, just as before. 

            I am at a loss at what to try next.  The Geotech Instrument people say they are too busy to give me any advice.  I am wondering if any of you using the RV301B helicorder has tried to use a split signal such as I described?  I would appreciate any suggestions from the PSN family. 

            Thanks and regards, 

            Al Hrubetz 

            Dallas, Texas