On 18/12/2018 19:53:16, Roland Fechter <fly-fechter@...> wrote:
Thanks, Gerry !
Re the A154 patch - they simply mislead people - I did not know -
before buying and now querying to them
that one can use the A154 only with its own cable - 5m long - and
that it does not "tolerate" any extension cable !
Nor did I know that they simply prefer not to test it with the
current dongles Airspy, Funcube, RTL SDR V.3 etc.
It seems that the only "right" place to use the A154 is the roof
of your car far far away from any interferences !
Inbuilt protection against the most common forms of interferences
seems to lack altogether !
Probably much too expensive for this surely made in China crap !
I will return my A154s to them for a refund !
Am 18.12.2018 um 18:59 schrieb gerrykuk
Hi Roland To be fair to
the seller they imply it is weak and needs a dish outdoors I am
using my antenna on a double glaze window sill and get over 10
dbs on 1537.100 mhz and 3dbs more on 1545.115 mhs no need for
LNA just strait to dongle which has protection diodes removed
then short end of 150 micro H to antenna input the long end of
choke to any 3.3 v point usuallt on one side of chunky capacitor
I also have 10 cm square gap antenna active ebay are out of
stock it is about 1 db better than WorldSpace but only covers
inmarsat frequencies I have destroyed one trying to remove saw
filter so I will leave the good one alone till China send more
to ebay .What dongles do you have ? I have e4000 and the other
ones be esd static careful on e4000 after removing protection
diodes to fit choke I have burnt out two 73 Gerry
17:16:21, Roland Fechter <fly-fechter@...> wr
Thanks - so they sell TRASH !
What is the signal strength OUTDOOR at your end ?
with or without LNA ?
How LONG is your cable - antenna head to your RX ?
Do you really use any of the 2 dongles I am going to have
Am 18.12.2018 um 15:24 schrieb
gerrykuk via Groups.Io:
HI Roland I
have got some A154 put on a oven tray indoors and only
got 3dbs signal the blurb on web page does say for
outdoor use.4.5v is plenty as it is 3v min.best practice
for amplifies keep as close to antenna as you can maybe
5cm ant to stop +ve feedback they use very little
current and therefore little voltage lose on ant.
lead.Hope this helps.I am using a WorldSpace radio
antenna with 1472 mhz sawfilter removed and link wire
fitted 3-3v to2.8v gives rtcp and 2.2v to 2.5v gives
lhcp at 75 ma max it is from a HITACHI KH-WS1 RADIO 70
Brt POUNDS Second hand 7db better than A154 and yuo get
10db by removing saw filter best removed by cutting out
using electrisions cutters as a lot of heat required to
remove it 73 Gerry Roland Fechter
I am going to receive an Airspy mini dongle and a
RTL SDR v.3 with inbuilt Bias T.
I am definitely mostly interested in the L-band and
in everything related to aircraft positions.
So I think Baud 1500 messages are of prime interest
Now what I will retain as equipment is the SDR-Kits
L-band patch antenna A154 for 1540 MHz band
plus the Nooelec Sawband LNA plus the two dongles
Length of my coax cable is abt. 15m 50% low loss and
I will no longer use my Funcube as I suspect
that its Bias T is defective.
I would like to profit from your experience -
addressing me to experts having identical equipment
and using it successfully for L-band AERO.
Both my new Dongles have the Bias T function - will
the 4.5V they provide be sufficient in my case to
power my A154 patch antenna through my 15m cable ?
And - is it useful to also run the Nooelec sawband
If so, where- at which place- to connect it ? Do I
place it right behind my dongle/s ? If I do so, can
I expect some "sapping" i.e. loss of voltage from
to my A154 patch antenna ? Will my patch antenna
still get enough voltage "despite" my sawband LNA ??
I am aware of the fact that I go on asking questions
which may make you "shake your head" but this is the
only reasonable way for a..beginner to know for sure
Again thank you for your patience and understanding
I look forward to your advice.
l-band antenna A154 for g mng