I need help, I am using a Mastr II and a URI. I want to use the vol/sql hi for my discriminator audio. I was going to use a resistor divider to pad down the audio. Has anyone ever done this? Could you explain it in more detail to me. I've read you take the two resistors and put them in series. I would tap my URI in the middle where those two resistors meet. I assume one end goes to vol/sql hi, but where does the far end go? Thanks for your help Apparare Scientior Paratus Communicare -N1XBM
Robert, The other end goes to ground. It would form a divider from the hi end of the pot to ground. You would take the audio from the center of the resistors. I do not have this radio so I have no idea what the resistor values would be or if you even need them but I can say you don't want to load that point down so you wouldn't want the total resistance to be too low. The upper resistor (closest to the pot) should be the larger value and the one to ground the lower. 73 Doug WA3DSP http://www.crompton.com/hamradio Date: Wed, 30 Oct 2013 12:45:01 -0400 From: N1XBM@amsat.org To: app_rpt-users@ohnosec.org Subject: [App_rpt-users] Resistor divider I need help, I am using a Mastr II and a URI. I want to use the vol/sql hi for my discriminator audio. I was going to use a resistor divider to pad down the audio. Has anyone ever done this? Could you explain it in more detail to me. I've read you take the two resistors and put them in series. I would tap my URI in the middle where those two resistors meet. I assume one end goes to vol/sql hi, but where does the far end go? Thanks for your help Apparare Scientior Paratus Communicare -N1XBM _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
I dont know why you would want a resistor divider on the VOL/SQ hi line. It should be ~ 1 V p-p with a signal with 1k tone modulated @ 3k dev. This is the perfect level to drive the URI. If it seems its overdriving the URI then disable the RX boost (RXboost=0) in the USBradio.conf file. Then retune. Jon VA3RQ On 10/30/2013 1:31 PM, Doug Crompton wrote:
Robert,
The other end goes to ground. It would form a divider from the hi end of the pot to ground. You would take the audio from the center of the resistors. I do not have this radio so I have no idea what the resistor values would be or if you even need them but I can say you don't want to load that point down so you wouldn't want the total resistance to be too low. The upper resistor (closest to the pot) should be the larger value and the one to ground the lower.
*73 Doug WA3DSP http://www.crompton.com/hamradio*
------------------------------------------------------------------------ Date: Wed, 30 Oct 2013 12:45:01 -0400 From: N1XBM@amsat.org To: app_rpt-users@ohnosec.org Subject: [App_rpt-users] Resistor divider
I need help, I am using a Mastr II and a URI. I want to use the vol/sql hi for my discriminator audio. I was going to use a resistor divider to pad down the audio. Has anyone ever done this? Could you explain it in more detail to me. I've read you take the two resistors and put them in series. I would tap my URI in the middle where those two resistors meet. I assume one end goes to vol/sql hi, but where does the far end go? Thanks for your help Apparare Scientior Paratus Communicare -N1XBM
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or +2.2 dBm (referenced against 600 ohms). For what it's worth, radio station consoles work normally (at least in all the plants I built or worked in...) at +4 dBm. there is MORE than enough level and adjustability without having to pad, attenuate, or go through gyrations to get this to work. I've interfaced everything from aforesaid consoles to cheap chinese HTs to commercial iron thru URIs with nothing other than wire and connectors to mate the equipment. -- Bryan Sent from my iPhone 5...small keyboard, big fingers...please forgive misspellings... On Oct 30, 2013, at 14:47, Jon Rorke <jrorke@cogeco.ca> wrote:
I dont know why you would want a resistor divider on the VOL/SQ hi line. It should be ~ 1 V p-p with a signal with 1k tone modulated @ 3k dev. This is the perfect level to drive the URI. If it seems its overdriving the URI then disable the RX boost (RXboost=0) in the USBradio.conf file. Then retune.
Jon VA3RQ On 10/30/2013 1:31 PM, Doug Crompton wrote:
Robert,
The other end goes to ground. It would form a divider from the hi end of the pot to ground. You would take the audio from the center of the resistors. I do not have this radio so I have no idea what the resistor values would be or if you even need them but I can say you don't want to load that point down so you wouldn't want the total resistance to be too low. The upper resistor (closest to the pot) should be the larger value and the one to ground the lower.
73 Doug WA3DSP http://www.crompton.com/hamradio
Date: Wed, 30 Oct 2013 12:45:01 -0400 From: N1XBM@amsat.org To: app_rpt-users@ohnosec.org Subject: [App_rpt-users] Resistor divider
I need help, I am using a Mastr II and a URI. I want to use the vol/sql hi for my discriminator audio. I was going to use a resistor divider to pad down the audio. Has anyone ever done this? Could you explain it in more detail to me. I've read you take the two resistors and put them in series. I would tap my URI in the middle where those two resistors meet. I assume one end goes to vol/sql hi, but where does the far end go? Thanks for your help Apparare Scientior Paratus Communicare -N1XBM
_______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
_______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
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Robert; You need to remove the sub audible tone when using vol hi, but if your not concerned with hearing your ctcss tones, use a 10uf cap off the vol hi through a series 10k to a 3.3k to ground. Tap the audio where the 10k meets the 3.3k resistor. Use a variable 5k pot in place of the 3.3k if you want to change the levels or just change the 3.3k value.... JK From: Robert Newberry <N1XBM@amsat.org> To: "app_rpt-users@ohnosec.org" <app_rpt-users@ohnosec.org> Sent: Wednesday, October 30, 2013 12:45 PM Subject: [App_rpt-users] Resistor divider I need help, I am using a Mastr II and a URI. I want to use the vol/sql hi for my discriminator audio. I was going to use a resistor divider to pad down the audio. Has anyone ever done this? Could you explain it in more detail to me. I've read you take the two resistors and put them in series. I would tap my URI in the middle where those two resistors meet. I assume one end goes to vol/sql hi, but where does the far end go? Thanks for your help Apparare Scientior Paratus Communicare -N1XBM _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
On my Mastr I I (station) I connected directly to VOL/SQL HI on the system shelf backplane. No pads, nor external shaping networks. Using the DSP for everything. Works great. Even have had compliments on the received audio. And Bryan, yep, our station also uses +4 as reference. As you say, pretty much standard practice. -- Sent from my Android phone with K-9 Mail. Please excuse my brevity and typing errors.
participants (6)
-
Bryan D. Boyle -
Doug Crompton -
Johnny Keeker -
Jon Rorke -
Robert A. Poff -
Robert Newberry