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
[ Top ]
[ Back ]
[ Home Page ]