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Need help: Radio in Car .. couple of problems
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. |
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"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,
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?? |
Dr.,
thanks ... alternator whine ... makes sense ... I split of the + from an accessory outlet in the boot (yes .. the cables are rated with enough AMPs), which comes from the fuse box ... picked up a noise filter today .. will put it in tomorrow ... sure it will work grounding .. just double checked everything .. seems to be ok .. I think the only way to achieve a better grounding would be to put a cable directly to the engine block, rather through the frame ;-) regards the 'breaking' .. it only happens with certain TXs, not all do the 'breaking-thingy' (hope that is the correct technical term) professional assistance .. nah .. don't think so .. this is a hobby .. so I shall learn and learn and learn until I know and can do it myself spell-checking .. if you can get me the partnumber I order a spell-checker with ICom .. called them today to order one.. they asked me to spell spellchecker .. but I didn't have a spell-checker-speller .. so .. need your assistance here .. thx Thanks, D. "Dr. Anton T. Squeegee" wrote in message ... In article , says... Hi, I am beginner .. sorry if some of this seems like stupid question(s): The only "stupid" question is the one you never ask. Frequencies used are in the 460Mhz-490Mhz range. Since the 2010/2020 series are FCC Part 90 type accepted, this is a good match. 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 ?) Alternator whine. Very common. You need to check that all your radio and antenna ground connections are clean and solid, that the body of the car is well-bonded (electrically speaking) to the engine block, and hence to the negative battery termimal, AND you should purchase and install an alternator whine filter. - If the car is stationary I can Rx ok, once the car is moving (maybe 50 kmh) the Rx is braking up That's "breaking," BTW. Possible antenna problems. You should check the forward and reflected power with a good-quality thruline RF wattmeter, such as a Bird 43 series or a Telewave. Also, the antenna's outer shell conductor may not be well grounded to the frame of the vehicle. If any or all of the above sounds unfamiliar or overly complex, I would strongly recommend that you seek professional assistance from whatever amateur radio club or two-way radio shop is local to your area. You cannot properly troubleshoot things like antenna problems without the proper test equipment. 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. Antenna cables should be cut to length unless the manufacturer of the antenna explicitly states otherwise in their printed instructions (which should have been included with the antenna). Could the transmition be causing the whisling noises ? No. That's "transmission," BTW. Is the antenna I am using a piece of s(*^&(^ and should I use a different one ? No idea. Antennas are pretty simple devices. If the one you have is built for the frequency range you're using, I don't see why it would not work if it was properly installed. -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute. (Known to some as Bruce Lane, ARS KC7GR, kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" |
On Mon, 29 Mar 2004 21:46:23 +1000, Jimmy wrote:
"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 Super Cheap Auto, Strathfields, pretty much any car audio shop. A local radio shop might well have them too. |
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