ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: 1 [2]  All   Go Down

Author Topic: AKG WMS 4500 Wireless - drop outs  (Read 1400 times)

Johan Nys

  • Newbie
  • *
  • Offline Offline
  • Posts: 4
Re: AKG WMS 4500 Wireless - drop outs
« Reply #10 on: February 06, 2022, 06:05:33 PM »

Hello,

Thank you all very much for your answers!

The receivers operate in 500-530MHz range, one of the few free areas left here in Belgium. I tried different frequencies within these band, same result...

On 2 receivers, it is the A antenna that is malfunctioning. The 3rd receiver has the same problem with the B antenna.
For both antennas, the display indicates full RF signal strength and the units also switch between the two antennas as expected.
But, as explained, with the malfunctioning antenna, the receiver will automatically mute if TCSQ is enabled. Or it will deliver about 15dB less audio signal if a fixed squelch is set.

I have no fear of opening up the units myself and trying to repair them. Soldering to SMD components is not a problem, but even with knowledge of electronics this is not easy.
Not easy, but certainly interesting ;-)

Johan

Logged

Johan Nys

  • Newbie
  • *
  • Offline Offline
  • Posts: 4
Re: AKG WMS 4500 Wireless - drop outs
« Reply #11 on: September 20, 2022, 10:50:19 AM »

Hello,

Meanwhile, I have used the three good receivers several times without any problem and the defective ones have been left aside.

A few weeks ago I met someone who had experienced the same problem with these devices. He told me that it was not a defect, but that the RF circuits need to be recalibrated.

In the AKG service manual, I cannot find any information on how to do this.

Does anyone has information about the tuning procedure for the SR4500 or can someone guide me on how to do this in general?

As mentioned, I have a fair amount of electronics knowledge, but insufficient skills in RF.
If necessary, I have (at work) an oscilloscope and an analyzer which both have sufficient bandwidth for a 500MHz signal.

It would be nice if I could still get them working. But to send them in for repair they might be a little old....

Thanks in advance!
Johan
Logged

Ike Zimbel

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 845
  • I'm not a newbie, I just play one on the internet!
    • Zimbel Audio Productions
Re: AKG WMS 4500 Wireless - drop outs
« Reply #12 on: September 20, 2022, 08:22:54 PM »

Hello,

Meanwhile, I have used the three good receivers several times without any problem and the defective ones have been left aside.

A few weeks ago I met someone who had experienced the same problem with these devices. He told me that it was not a defect, but that the RF circuits need to be recalibrated.

In the AKG service manual, I cannot find any information on how to do this.

Does anyone has information about the tuning procedure for the SR4500 or can someone guide me on how to do this in general?

As mentioned, I have a fair amount of electronics knowledge, but insufficient skills in RF.
If necessary, I have (at work) an oscilloscope and an analyzer which both have sufficient bandwidth for a 500MHz signal.

It would be nice if I could still get them working. But to send them in for repair they might be a little old....

Thanks in advance!
Johan
Not at all familiar with this unit, but I was told by a Sennheiser tech, back around 2015, that all calibration for the 2000 series was in firmware, not hardware. So, if the akg is a similar device and if it's possible to obtain and reload the FW (if it has any...) that might do the trick.
Logged
~Ike Zimbel~
Wireless frequency coordination specialist and educator.
Manufacturer's Representative (Canada)
Radio Active Designs
Pro Audio equipment repair and upgrades.
~416-720-0887~
ca.linkedin.com/pub/ike-zimbel/48/aa1/266

ProSoundWeb Community

Re: AKG WMS 4500 Wireless - drop outs
« Reply #12 on: September 20, 2022, 08:22:54 PM »


Pages: 1 [2]  All   Go Up
 



Site Hosted By Ashdown Technologies, Inc.

Page created in 0.034 seconds with 25 queries.