PSN-L Email List Message

Subject: Re: SPLIT SIGNAL PROBLEM
From: AHrubetz@.......
Date: Fri, 21 Aug 2009 20:03:14 EDT


Hi Jon,
    Yes, I am using an RCA cable  with one main connector with two out=20
connectors - a simple cable split - as you  mentioned.
    Thanks and  regards,
    Al
=20
=20
In a message dated 8/21/2009 6:45:08 P.M. Central Daylight Time, =20
jonfr@......... writes:

Hi

RCA Y type connectors can send signal only one way. RCA Y  type connectors=
=20
do carry the frequancy that seismomters send to the amp board.  But you ne=
ed=20
to make sure that the signal is going to right path trouth the Y  connecto=
r.

It might be a better solution for you to use RCA cable with  one main=20
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: =20
Thanks,  Jon.  I am using the standard RCA type connectors and plugs,=20
including  the Y connector.  I have used the Y connector for many years in=
 the =20
past with a split signal to the amp/filter board and to a Omniscribe chart=
 =20
recorder with no problems.=20

Regards,=20

Al=20



In a message dated  8/21/2009 6:18:32 P.M. Central Daylight Time,=20
jonfr@.........  writes:=20


Hello.

The Y connector most likley does not carry the frequancy  that your sensor=
=20
is sending to the amp board.

Regards.
J=F3n Fr=EDmann.

On f=F6s, 2009-08-21 at 18:34 -0400, AHrubetz@....... wrote: =20

Some months  ago I purchased a Geotech Instruments Helicorder RV-301B with=
=20
the  accompanying amplifier AR-320B.  It works just fine when I drive it=
 =20
using one channel from one of Larry's older amp/filter boards.  The  input=
 is=20
from a Lehman-type horizontal detector utilizing a  coil with 8k resistanc=
e.=20
(hz1 detector).   =20
I normally have  the Lehman hz1 output going into a second, newer version=
 =20
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=20
connector  to both the WinSDR display and the helicorder so I can record=
 analog and=20
 digital simultaneously.  When I do this, the helicorder stylus goes  dead=
=20
and the CRT display from the amp/filter/AD board displays rhythmic =20
amplitude spiking.  There appeared to be an impedance  mismatch, so  an EE=
 designed=20
a buffer amplifier for me with  two outputs.  Unfortunately, when using th=
e=20
buffer amp, the  helicorder stylus still is inoperative and the spiking=20
again shows up on  the CRT display from the amp/filter/AD board, just as=
 =20
before. =20
I am at a  loss at what to try next.  The Geotech Instrument people say =
=20
they are too busy to give me any advice.  I am wondering if any of  you us=
ing=20
the RV301B helicorder has tried to use a split signal such as  I described=
? =20
I would appreciate any suggestions from the PSN  family. =20
Thanks and  regards, =20
Al  Hrubetz =20
Dallas,  Texas =20


=20
____________________________________





=20
____________________________________








Hi Jon,
    Yes, I am using an RCA= cable=20 with one main connector with two out connectors - a simple cable split -= as you=20 mentioned.
    Thanks and=20 regards,
    Al
 
In a message dated 8/21/2009 6:45:08 P.M. Central Daylight Time,=20 jonfr@......... writes:
Hi

RCA Y type connectors can send signal only one wa= y. RCA Y=20 type connectors do carry the frequancy that seismomters send to the amp= board.=20 But you need to make sure that the signal is going to right path trouth= the Y=20 connector.

It might be a better solution for you to use RCA cable= with=20 one main connector with two out connectors. As that is just a simple cap= le=20 split.

Regards.
J=F3n Fr=EDmann.

On f=F6s, 2009-08-21= at 19:38=20 -0400, AHrubetz@....... wrote:=20
Thanks= ,=20 Jon.  I am using the standard RCA type connectors and plugs, incl= uding=20 the Y connector.  I have used the Y connector for many years in= the=20 past with a split signal to the amp/filter board and to a Omniscribe= chart=20 recorder with no problems.
Regards,
Al
In a mess= age dated=20 8/21/2009 6:18:32 P.M. Central Daylight Time, jonfr@............ writes:
Hello.

The Y connector most likley does not carry the frequ= ancy=20 that your sensor is sending to the amp board.

<= FONT=20 size=3D2>Regards.
J=F3n Fr=EDmann.

On f=F6s, 2009-08-21 at 18:34 -0400, AHrubetz@....... m wrote:=20
So= me months=20 ago I purchased a Geotech Instruments Helicorder RV-301B with= the=20 accompanying amplifier AR-320B.  It works just fine when I dr= ive it=20 using one channel from one of Larry's older amp/filter boards.&nbs= p; The=20 input is from a Lehman-type horizontal detector utilizin= g a=20 coil with 8k resistance. (hz1 detector). =20   =20
I normal= ly have=20 the Lehman hz1 output going into a second, newer ve= rsion=20 of Larry's amp/filter A/D boards, and then on=20 to WinSDR.  
Here is my=20 problem:  I want to split the output from hz1 using a Y conne= ctor=20 to both the WinSDR display and the helicorder so I can record anal= og and=20 digital simultaneously.  When I do this, the helicorder stylu= s goes=20 dead and the CRT display from the amp/filter/AD board displays rhy= thmic=20 amplitude spiking.  There appeared to be an impedan= ce=20 mismatch, so  an EE designed a buffer amplifier for me= with=20 two outputs.  Unfortunately, when using the buffer amp, the= =20 helicorder stylus still is inoperative and the spiking again shows= up on=20 the CRT display from the amp/filter/AD board, just as=20 before.=20
I am at= a=20 loss at what to try next.  The Geotech Instrument people= say=20 they are too busy to give me any advice.  I am wondering if= any of=20 you using the RV301B helicorder has tried to use a split signal su= ch as=20 I described?  I would appreciate any suggestions from the PSN= =20 family.=20
Thanks= and=20 regards,=20
Al=20 Hrubetz=20
Dallas,= =20 Texas=20
 = =20






=

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