Adjustable-External FM 100MHz
|BoxMatrix >> Accessories >> Adjustable-External FM 100MHz
|Adjustable-External FM 100MHz - Nick: aefm
|Adjustable-External-Antenna - Vendor: AVM
|Introduced: 2008 - Market: no - Price: no
Adjustable "snap-in" mounted visible antennas, wired via a fixed IPEX pigtail.
In fact this is just the third and middle Adjustable-External WLAN 2.4/5GHz antenna.
This antenna was dedicated to an idea which never was used in the wild!
To understand this some historical info:
The 7270v1 and 7270v2 used a WLAN chip which supports 3xRX, 3xTX, 2 Streams,
which means it supports 3 antennas but can only use 2 simultaneous MIMO streams.
The 7270v3 got a new WLAN chip which only supports 2 antennas for 2 MIMO streams.
So the middle antenna was not required any more for WLAN.
In the same time AVM developed the FRITZ!WLAN Repeater N/G with fancy audio features,
and a narrow reach (10m) FM transmitter, which enables a ghettoblaster for wireless audio output.
This transmitter is realized in a FPGA and it used a PCB-Mounted FM 100MHz antenna.
Since the repeater and the v3 use the same UR8 SoC and both have a FPGA AVM obsiously
thought they found a new use for the superflous middle antenna and they connected it to the FPGA.
Noone knows why it never was activated. Was it a marketing decision to not hurt repeater N/G sales,
or were there unexpected technical side effects which ended this plan? Noone knows.
No release firmware ever supported this feature, and even no Labor is known which did.
The Adjustable-External FM 100MHz antenna is used in these models: