Viewing 4 posts - 1 through 4 (of 4 total)
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  • October 7, 2018 at 10:54 am #2546
    James, VE1JCS
    User

    Just a quick question, I have upgraded to the current software. What I am noticing is if I key up the ORP repeater, after it Identifies and it sits without input until it times out there is a loud hissing noise in the background.
    I have unplugged both audio inputs to the V1.1 svlinx board and same issue
    I have tried shorting out the inputs to Grnd momentarily to see if it goes away and no change.
    Is there a setting in the mixer to adjust this?
    Other than that all seems to work great.

    Thank You

    James VE1JCS

    October 7, 2018 at 3:27 pm #2548
    Aaron, N3MBH
    Forum Administrator

    Hello James,
    There isn’t really a setting in alsamixer for this. I would just make sure that your outputs and inputs are set first to a reasonably level in software (alsamixer) so you get better dynamic range, then adjust your pots on the SVXLink card.

    Outside of that, I would suspect 1 of 2 things. Either you are getting RF introduced back into the input audio via your sound card or cabling, or you just have cheap sound cards. I have some sound cards that introduce hissing. If you can try to test input and output on a computer and see if the hissing is present. For the first item, try running into a dummy load to see if you can attenuate your TX signal enough as to not effect the RX side.

    73,
    Aaron – N3MBH / WRFV871

    OpenRepeater is offered free of charge. Find out how you can support us.

    October 16, 2018 at 9:29 pm #2553
    James, VE1JCS
    User

    Just an update, I checked what you mentioned and could not correct the problem. What i did find that eliminated the problem was shorting out the 1k resistor on the Repeater input (R13) That seems to correct the problem?
    So i just soldered in a jumper pin on both inputs resistors thus allowing me to short out the resistor if required. It also gave me more audio, but was able to adj. that down by using the potentiometer

    James VE1JCS

    October 17, 2018 at 6:21 pm #2555
    Aaron, N3MBH
    Forum Administrator

    James,
    Glad to hear you found a solution. Yeah unfortunately when interfacing hardware together you can encounter some strange situations like that. I know when interfacing my ICS board to my Motorola repeater, I had some issues with it holding the PTT active after the initial key up with was baffling me. Ended up having to remove an LED that was functioning as voltage divider in my case can causing the pin to float.

    73,
    Aaron – N3MBH / WRFV871

    OpenRepeater is offered free of charge. Find out how you can support us.

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