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In article ,
Howard wrote: Sounds a lot like 'alternator whine'. Is your radio hooked directly to the battery, if not then proceed to make it so (and fuse both positive and negative leads). If that does nothing, or not enough, to fix the problem you may wish to consider a DC noise filter. RatShack carries a couple of them, the 10 amp model is about $16 (pn 270-051). Even if the radio only draws 10 amps on transmit, I'de get the 20 amp filter. You'll have less voltage loss that way. -- Larry Weil Lake Wobegone, NH |
In article ,
Howard wrote: Sounds a lot like 'alternator whine'. Is your radio hooked directly to the battery, if not then proceed to make it so (and fuse both positive and negative leads). If that does nothing, or not enough, to fix the problem you may wish to consider a DC noise filter. RatShack carries a couple of them, the 10 amp model is about $16 (pn 270-051). Even if the radio only draws 10 amps on transmit, I'de get the 20 amp filter. You'll have less voltage loss that way. -- Larry Weil Lake Wobegone, NH |
"D." wrote in message om... Hi, I am beginner .. sorry if some of this seems like stupid question(s): I have installed a ICom F2010(2020) into my Jeep. The radio unit itself is installed in the back where the CD changer was, the antenna cable is a bit too long, so it is stored in a loop. Control unit is seperated with 8 meter cable from main unit and is mounted underneath the ashtray (so basically it is sitting above the gear box). The antenna is mounted on the roof the car: A GME 409L (ground independend), mounted on a spring S004 Frequencies used are in the 460Mhz-490Mhz range. The problems I am experiencing now: - Whenever the unit is Rx ... I can hear a whisling sound, which is only audible if I accelerate (there seems to be a relationship to the RPMs ?) - If the car is stationary I can Rx ok, once the car is moving (maybe 50 kmh) the Rx is braking up Is above normal, if not .. any ideas how to fix it ? I am aware that I should shorten the antenna cable, rather than looping it. Could the transmition be causing the whisling noises ? Is the antenna I am using a piece of s(*^&(^ and should I use a different one ? Thanks, D. I had the same problem but with a PRM8010, On Transmit you could hear an alternator noise, so all i need is a noise filter? Where abouts can i get one and how much?? |
"D." wrote in message om... Hi, I am beginner .. sorry if some of this seems like stupid question(s): I have installed a ICom F2010(2020) into my Jeep. The radio unit itself is installed in the back where the CD changer was, the antenna cable is a bit too long, so it is stored in a loop. Control unit is seperated with 8 meter cable from main unit and is mounted underneath the ashtray (so basically it is sitting above the gear box). The antenna is mounted on the roof the car: A GME 409L (ground independend), mounted on a spring S004 Frequencies used are in the 460Mhz-490Mhz range. The problems I am experiencing now: - Whenever the unit is Rx ... I can hear a whisling sound, which is only audible if I accelerate (there seems to be a relationship to the RPMs ?) - If the car is stationary I can Rx ok, once the car is moving (maybe 50 kmh) the Rx is braking up Is above normal, if not .. any ideas how to fix it ? I am aware that I should shorten the antenna cable, rather than looping it. Could the transmition be causing the whisling noises ? Is the antenna I am using a piece of s(*^&(^ and should I use a different one ? Thanks, D. I had the same problem but with a PRM8010, On Transmit you could hear an alternator noise, so all i need is a noise filter? Where abouts can i get one and how much?? |
"Jimmy" wrote in message ... "D." wrote in message om... Hi, I am beginner .. sorry if some of this seems like stupid question(s): I have installed a ICom F2010(2020) into my Jeep. The radio unit itself is installed in the back where the CD changer was, the antenna cable is a bit too long, so it is stored in a loop. Control unit is seperated with 8 meter cable from main unit and is mounted underneath the ashtray (so basically it is sitting above the gear box). The antenna is mounted on the roof the car: A GME 409L (ground independend), mounted on a spring S004 Frequencies used are in the 460Mhz-490Mhz range. The problems I am experiencing now: - Whenever the unit is Rx ... I can hear a whisling sound, which is only audible if I accelerate (there seems to be a relationship to the RPMs ?) - If the car is stationary I can Rx ok, once the car is moving (maybe 50 kmh) the Rx is braking up Is above normal, if not .. any ideas how to fix it ? I am aware that I should shorten the antenna cable, rather than looping it. Could the transmition be causing the whisling noises ? Is the antenna I am using a piece of s(*^&(^ and should I use a different one ? Thanks, D. I had the same problem but with a PRM8010, On Transmit you could hear an alternator noise, so all i need is a noise filter? Where abouts can i get one and how much?? In australia by the way |
"Jimmy" wrote in message ... "D." wrote in message om... Hi, I am beginner .. sorry if some of this seems like stupid question(s): I have installed a ICom F2010(2020) into my Jeep. The radio unit itself is installed in the back where the CD changer was, the antenna cable is a bit too long, so it is stored in a loop. Control unit is seperated with 8 meter cable from main unit and is mounted underneath the ashtray (so basically it is sitting above the gear box). The antenna is mounted on the roof the car: A GME 409L (ground independend), mounted on a spring S004 Frequencies used are in the 460Mhz-490Mhz range. The problems I am experiencing now: - Whenever the unit is Rx ... I can hear a whisling sound, which is only audible if I accelerate (there seems to be a relationship to the RPMs ?) - If the car is stationary I can Rx ok, once the car is moving (maybe 50 kmh) the Rx is braking up Is above normal, if not .. any ideas how to fix it ? I am aware that I should shorten the antenna cable, rather than looping it. Could the transmition be causing the whisling noises ? Is the antenna I am using a piece of s(*^&(^ and should I use a different one ? Thanks, D. I had the same problem but with a PRM8010, On Transmit you could hear an alternator noise, so all i need is a noise filter? Where abouts can i get one and how much?? In australia by the way |
Jimmy,
just picked one up from SuperCheapAuto (or something like that) ... there is one for AUD 10 and one for AUD 30. Will put it in tomorrow and see how it goes D. "Jimmy" wrote in message ... "D." wrote in message om... Hi, I am beginner .. sorry if some of this seems like stupid question(s): I have installed a ICom F2010(2020) into my Jeep. The radio unit itself is installed in the back where the CD changer was, the antenna cable is a bit too long, so it is stored in a loop. Control unit is seperated with 8 meter cable from main unit and is mounted underneath the ashtray (so basically it is sitting above the gear box). The antenna is mounted on the roof the car: A GME 409L (ground independend), mounted on a spring S004 Frequencies used are in the 460Mhz-490Mhz range. The problems I am experiencing now: - Whenever the unit is Rx ... I can hear a whisling sound, which is only audible if I accelerate (there seems to be a relationship to the RPMs ?) - If the car is stationary I can Rx ok, once the car is moving (maybe 50 kmh) the Rx is braking up Is above normal, if not .. any ideas how to fix it ? I am aware that I should shorten the antenna cable, rather than looping it. Could the transmition be causing the whisling noises ? Is the antenna I am using a piece of s(*^&(^ and should I use a different one ? Thanks, D. I had the same problem but with a PRM8010, On Transmit you could hear an alternator noise, so all i need is a noise filter? Where abouts can i get one and how much?? |
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