Re: [App_rpt-users] Something is rotten in the state of Denmark
I suppose it could but that would make no sense because the receiver uses this high freq noise to operate its own squelch. You may want to play with the squelch setting a bit. GeorgeC A typical hardware squelch, using, for example, the MC3361, takes the output of the discriminator puts it though a small capacitor (which acts like a high pass filter) and runs it through a "noise amplifier" before applying it to the level detector. The discriminator output of this same detector circuit taps off before the noise amplifier and will likely have some low pass filtering - intended to scrape off the 455 kHz AC - but probably will reduce the level of signals in the 10-20 kHz range somewhat... Ken
Yep, lots of radios don't have enough high frequency noise at the discriminator output to work with USBradio (or and RTCM) but squelch themselves just fine. In that case you must use COR. And if you use COR you may as well use SimpleUSB. -- Tim :wq On Mar 30, 2013, at 6:33 PM, Ken <ke2n@cs.com> wrote:
I suppose it could but that would make no sense because the receiver uses this high freq noise to operate its own squelch. You may want to play with the squelch setting a bit.
GeorgeC
A typical hardware squelch, using, for example, the MC3361, takes the output of the discriminator puts it though a small capacitor (which acts like a high pass filter) and runs it through a "noise amplifier" before applying it to the level detector. The discriminator output of this same detector circuit taps off before the noise amplifier and will likely have some low pass filtering - intended to scrape off the 455 kHz AC - but probably will reduce the level of signals in the 10-20 kHz range somewhat...
Ken
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Ok , anyone had good result with maxtrac/gm300? With usbradio? I do have a spare vhf maxtrac 300 and a radium m100 , I was planning on using one of those as my exiter cause its failling on my msr2000. So if app_rpt works better with those type of radio, I will work with those and drop the msr, exept the PA. At 100 watt continuous, its way better then 25 intermitent ;-) Envoyé de mon iPad Le 30 Mar 2013 à 23:05, "Tim Sawyer" <tim.sawyer@me.com> a écrit :
Yep, lots of radios don't have enough high frequency noise at the discriminator output to work with USBradio (or and RTCM) but squelch themselves just fine. In that case you must use COR. And if you use COR you may as well use SimpleUSB. -- Tim :wq
On Mar 30, 2013, at 6:33 PM, Ken <ke2n@cs.com> wrote:
I suppose it could but that would make no sense because the receiver uses this high freq noise to operate its own squelch. You may want to play with the squelch setting a bit.
GeorgeC
A typical hardware squelch, using, for example, the MC3361, takes the output of the discriminator puts it though a small capacitor (which acts like a high pass filter) and runs it through a "noise amplifier" before applying it to the level detector. The discriminator output of this same detector circuit taps off before the noise amplifier and will likely have some low pass filtering - intended to scrape off the 455 kHz AC - but probably will reduce the level of signals in the 10-20 kHz range somewhat...
Ken
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I just found my notes on the MSR-2000 that I did for a friend a year or so ago. Looks like I needed to run the discriminator (rx pin 5) through the amplifier in the URI. Also picked up +12vdc for the amp from the receiver connector. Running fine with usbradio and using the DSP. Bob WB3AWJ Allstar 27784 -- Sent from my Android phone with K-9 Mail. Please excuse my brevity.
Does not the 12 volt is for the output amplication ? Envoyé de mon iPad Le 31 Mar 2013 à 08:56, "Robert a. Poff" <wb3awj@comcast.net> a écrit :
I just found my notes on the MSR-2000 that I did for a friend a year or so ago.
Looks like I needed to run the discriminator (rx pin 5) through the amplifier in the URI. Also picked up +12vdc for the amp from the receiver connector.
Running fine with usbradio and using the DSP.
Bob WB3AWJ Allstar 27784 -- Sent from my Android phone with K-9 Mail. Please excuse my brevity.
Oups amplification Envoyé de mon iPad Le 31 Mar 2013 à 10:18, "pete M" <petem001@hotmail.com> a écrit :
Does not the 12 volt is for the output amplication ?
Envoyé de mon iPad
Le 31 Mar 2013 à 08:56, "Robert a. Poff" <wb3awj@comcast.net> a écrit :
I just found my notes on the MSR-2000 that I did for a friend a year or so ago.
Looks like I needed to run the discriminator (rx pin 5) through the amplifier in the URI. Also picked up +12vdc for the amp from the receiver connector.
Running fine with usbradio and using the DSP.
Bob WB3AWJ Allstar 27784 -- Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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participants (4)
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Ken -
pete M -
Robert a. Poff -
Tim Sawyer