altinex switches
I haven't looked any further but the daughter boards
in the unit have 75 ohm resistors which I'm guessing
determines the input/output impedance of the unit.
If that's the case it should be easy to switch it to 50
ohms although it may not make any real difference.
-Arthur
Arthur the video equipment is 75 ohms. This is time-nuttery after all so
they do make a difference. Small.
But I will never change my 75 ohm resistors out not worth the time and
effort by the way I also use 75 ohm cable for Freq distro.
But if someone really has nothing better to do then sure change those pesky
1% resistors out. :-)
Regards
Paul
WB8TSL
On Thu, Feb 21, 2013 at 3:57 PM, Arthur Dent golgarfrincham@yahoo.comwrote:
I haven't looked any further but the daughter boards
in the unit have 75 ohm resistors which I'm guessing
determines the input/output impedance of the unit.
If that's the case it should be easy to switch it to 50
ohms although it may not make any real difference.
-Arthur
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi
Be careful with the BNC connectors on those switches. 75 ohm BNC's aren't
the same as 50 ohm connectors. The inner contact is different enough that
they don't always play well together.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Arthur Dent
Sent: Thursday, February 21, 2013 3:57 PM
To: time-nuts@febo.com
Subject: [time-nuts] altinex switches
I haven't looked any further but the daughter boards
in the unit have 75 ohm resistors which I'm guessing
determines the input/output impedance of the unit.
If that's the case it should be easy to switch it to 50
ohms although it may not make any real difference.
-Arthur
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Good point Bob the 75 ohms are smaller in diameter. I use 75 ohm connectors.
The 50 into a 75 hole spreads the jack.
Regards
Paul
WB8TSL
On Thu, Feb 21, 2013 at 4:16 PM, Bob Camp lists@rtty.us wrote:
Hi
Be careful with the BNC connectors on those switches. 75 ohm BNC's aren't
the same as 50 ohm connectors. The inner contact is different enough that
they don't always play well together.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Arthur Dent
Sent: Thursday, February 21, 2013 3:57 PM
To: time-nuts@febo.com
Subject: [time-nuts] altinex switches
I haven't looked any further but the daughter boards
in the unit have 75 ohm resistors which I'm guessing
determines the input/output impedance of the unit.
If that's the case it should be easy to switch it to 50
ohms although it may not make any real difference.
-Arthur
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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and follow the instructions there.
I've been known to just stack a 150 Ohm 1% chip resistor on top of a 75 Ohm chip
resistor to bring the result down to 50 Ohms. Beats having to 1) remove the old
part, 2) clean up the pads, then 3) get the new one soldered down.
Bob L.
From: Arthur Dent golgarfrincham@yahoo.com
To: "time-nuts@febo.com" time-nuts@febo.com
Sent: Thu, February 21, 2013 4:13:48 PM
Subject: [time-nuts] altinex switches
... it should be easy to switch it to 50 ohms although it may not make any real
difference.
I don't have the manual source offhand, but it will be in my msg
archived. The RS232 does respond, and can also be used to control the
unit I have. I got a nice note from the seller; apparently the time-nuts
snatched these units up in less than a day...and it was the seller who
put me on to the manual, a typical Google got me nothing. I'll be home
next week, and can supply the manual URL then if you can't find it.
Don
Robert LaJeunesse
I've been known to just stack a 150 Ohm 1% chip resistor on top of a 75
Ohm chip
resistor to bring the result down to 50 Ohms. Beats having to 1) remove
the old
part, 2) clean up the pads, then 3) get the new one soldered down.
Bob L.
From: Arthur Dent golgarfrincham@yahoo.com
To: "time-nuts@febo.com" time-nuts@febo.com
Sent: Thu, February 21, 2013 4:13:48 PM
Subject: [time-nuts] altinex switches
... it should be easy to switch it to 50 ohms although it may not make
any real
difference.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
Update: The manual is at:
http://pdf.textfiles.com/manuals/STARINMANUALS/Altinex/Manual/Archive/Home%20Run%20(HR)%20Series.pdf
Just verified, and it's still there.
Don
Don Latham
I don't have the manual source offhand, but it will be in my msg
archived. The RS232 does respond, and can also be used to control the
unit I have. I got a nice note from the seller; apparently the time-nuts
snatched these units up in less than a day...and it was the seller who
put me on to the manual, a typical Google got me nothing. I'll be home
next week, and can supply the manual URL then if you can't find it.
Don
Robert LaJeunesse
I've been known to just stack a 150 Ohm 1% chip resistor on top of a
75
Ohm chip
resistor to bring the result down to 50 Ohms. Beats having to 1)
remove
the old
part, 2) clean up the pads, then 3) get the new one soldered down.
Bob L.
From: Arthur Dent golgarfrincham@yahoo.com
To: "time-nuts@febo.com" time-nuts@febo.com
Sent: Thu, February 21, 2013 4:13:48 PM
Subject: [time-nuts] altinex switches
... it should be easy to switch it to 50 ohms although it may not make
any real
difference.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
Don;
I got one of those switchs;very nice product, great price. Wish I'd
bought two!
Do you have a reference for the mating connector for the RS232 by any
chance?
JimT
Sent from my galaxy (Nexus).
On Feb 21, 2013 4:13 PM, "Don Latham" djl@montana.com wrote:
I don't have the manual source offhand, but it will be in my msg
archived. The RS232 does respond, and can also be used to control the
unit I have. I got a nice note from the seller; apparently the time-nuts
snatched these units up in less than a day...and it was the seller who
put me on to the manual, a typical Google got me nothing. I'll be home
next week, and can supply the manual URL then if you can't find it.
Don
Robert LaJeunesse
I've been known to just stack a 150 Ohm 1% chip resistor on top of a 75
Ohm chip
resistor to bring the result down to 50 Ohms. Beats having to 1) remove
the old
part, 2) clean up the pads, then 3) get the new one soldered down.
Bob L.
From: Arthur Dent golgarfrincham@yahoo.com
To: "time-nuts@febo.com" time-nuts@febo.com
Sent: Thu, February 21, 2013 4:13:48 PM
Subject: [time-nuts] altinex switches
... it should be easy to switch it to 50 ohms although it may not make
any real
difference.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi Jim: I had to make up a little 3-pin to 9-pin adapter using loose
pins. It just kinda hangs there...
Don
James Tucker
Don;
I got one of those switchs;very nice product, great price. Wish I'd
bought two!
Do you have a reference for the mating connector for the RS232 by any
chance?
JimT
Sent from my galaxy (Nexus).
On Feb 21, 2013 4:13 PM, "Don Latham" djl@montana.com wrote:
I don't have the manual source offhand, but it will be in my msg
archived. The RS232 does respond, and can also be used to control the
unit I have. I got a nice note from the seller; apparently the
time-nuts
snatched these units up in less than a day...and it was the seller who
put me on to the manual, a typical Google got me nothing. I'll be home
next week, and can supply the manual URL then if you can't find it.
Don
Robert LaJeunesse
I've been known to just stack a 150 Ohm 1% chip resistor on top of a
75
Ohm chip
resistor to bring the result down to 50 Ohms. Beats having to 1)
remove
the old
part, 2) clean up the pads, then 3) get the new one soldered down.
Bob L.
From: Arthur Dent golgarfrincham@yahoo.com
To: "time-nuts@febo.com" time-nuts@febo.com
Sent: Thu, February 21, 2013 4:13:48 PM
Subject: [time-nuts] altinex switches
... it should be easy to switch it to 50 ohms although it may not
make
any real
difference.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
In general, no, they are not. The connector pins for modern 75ohm
BNC's are exactly the same part as for modern 50 ohm BNC's. The BNC
gets the higher impedance inside of the connection area by removing
most of the inner dielectric.
The real problem child, in general, is the female 75 ohm N connector,
vs the male 50 ohm N connector. In this case, the connector has no
dielectric in the mating area, so in order to keep the impedance
constant, it has to have a smaller diameter center conductor on the
75 ohm variant. If you attempt to mate a 50 ohm male N connector
with a 75 ohm female N connector, you will split out the female
center socket pin.
Legend has it that there were some variations of the 75 ohm BNC that
don't work with 50 ohm variety.... I can't speak to whether or not
that is true, only that in my 40 years in the business, I have never
seen one where there was a problem.
-Chuck Harris
paul swed wrote:
Good point Bob the 75 ohms are smaller in diameter. I use 75 ohm connectors.
The 50 into a 75 hole spreads the jack.
Regards
Paul
WB8TSL
On Thu, Feb 21, 2013 at 4:16 PM, Bob Camp lists@rtty.us wrote:
Hi
Be careful with the BNC connectors on those switches. 75 ohm BNC's aren't
the same as 50 ohm connectors. The inner contact is different enough that
they don't always play well together.
Bob