Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

No FM on aftermarket stereo

Recommended Posts

I just replaced my original stereo with a pioneer 4100nex. I installed with a most box but when I plugged in the antenna with the pigtail that came with the installation kit I get next to zero stations. Is there a wire needed to power the antenna booster that is in the car?

Link to comment
Share on other sites

Sometimes the radio comes from the box set in a different frequency code than what is used in your area. It is almost as if it searches "in between" the known and available frequencies. If you look in the manual, or online, you will find the correct sequence to change that to the other frequency setting...sometimes by pressing the FM button with another one for 5 seconds or so. Have a look, it might do the trick. Neels

Sent from my iPad using Tapatalk

Link to comment
Share on other sites

I don't think that a booster will help a zero station problem. You probably have a faulty antenna connection somewhere. You can test this easily with an FM modulator connected to an MP3 player or any other source. Here are some steps: 

1. Obtain an FM modulator- any cheap model from the "phone accessory rack" will work. Since you are receiving very few stations, you can tune it to any frequency.

2. Launch some content on the player and verify that you are transmitting by testing on a "good" radio install

3. Take the setup to the problem car and move the transmitter close to your windshield antenna, then close to the head unit.

4.  You should hear a substantial volume gain when you move the test setup up to the windshield, like when you move it close to the head unit.

If you hear no difference, then you have a bad connection somewhere. You can use the test setup as a signal tracer to help locate the problem.


Modern day head units are far less sensitive than old school radios were so they will never perform like an old Pioneer SuperTuner or other hi-perf old radio. . Current radios use PLL (phase lock loop) RF chips that can be tuned from low frequencies all the way up to microwave. The SmartPhone explosion provided this inexpensive PLL technology. However, these chips don't compare in performance to an RF section that uses discrete components combined with a design that is tailored to a specific band such as FM's 88-108 mhz spectrum.

A quick note on Boosters: they range dramatically in terms of cost and functionality. Some have a single transistor that will amplify noise and multipath along with the valid signal. Others are multi-stage and incorporate filters.

I would double-check everything first prior to trying a booster.

Hope this helps.Jerry Prado


Edited by Jerry Prado
Link to comment
Share on other sites

Thanks for the input. I had great signal with the factory stereo but now nothing. I tried 2 separate powered boosters. Both did better when holding in my hand than when it was plugged into the black antenna cord. I just had my front cowl? Not sure if that is the name of it, but It is the piece under the wiper arms. I think that is where the antenna connects to the windshield maybe they knocked it off. I was thinking about just running a "hidden" antenna under that same piece to have an antenna but there are mixed reviews on the product

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.