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This is what users of my filters have
to say:
Steve G4TRA writes
I have now had a chance of
testing the filter which works fine. For the first time I am
able to see the subtle changes that the transmit frequency does
to the received signal being transmitted back to me from the
repeater. Also I am able to adjust my camera for the best
response out of the repeater as well. All in all an excellent
ATV duplex filter. I cannot imagine anyone doing without one of
these if they want to see their transmitted picture coming out
of the repeater. Many thanks for the excellent service, you
could teach the "big" boys a thing or two about customer
communications and I have no trouble in recommending you to any
other interested parties.
All I need now is a decent 1316MHz receive high gain beam.
Cheers Steve
John Haddon
of Exemplar-Associates:
I
used the filter "in anger" on Sunday and it was just fine. Thanks
for your help!
Bill MW1WEJ writes
The
filter that Brian made and tested for me is located in the roof
space of my bungalow at the end of two metres of coaxial attached to
my homemade 23cm 15-element antenna. This is in turn about 10 metres
to the side and 3 metres behind my Tx antenna. Before I fitted the
filter a slipping ghost image was present on the Rx monitor when my
Tx was on. With the filter in place and followed by a 20 db preamp
the display produces P5 results from a MASPRO under favourable
signal conditions. 73s Bill MW1WEJ
Derek GW3FDZ
writes
To enable me to observe my
reradiated signal from GB3GW (which has a separation between send
and receive of only thirty megahertz) I purchased one of Brian’s
filters. A separate antenna, which is located approximately fifty
metres from my transmitting antenna, is used for receiving this
signal. The filter proved to be highly effective due to its
pass-band characteristics. A very slight tweaking of the tuning
stubs whilst looking at a test card ensured that the filter was
matched correctly to my particular antenna and receiver in
use whilst retaining the required bandwidth for a good colour
picture. No breakthrough has ever been observed during low signal
conditions even though I am transmitting maximum allowed power
output. A useful addition is the calibration chart, which is affixed
to the filter case. This filter is excellent value for money and
highly recommended. GW3FDZ.
Tim
G7YGS writes
It
is a good filter and I use it at home for watch through after
retuning it to 1316mhz. If anyone asks me about filters then I would
recommend them to you. Cheers for now. Tim (g7ugs).
Pat GW6IMS writes
I work through GB3GW
repeater. I have one of Brian’s filters tuned to 1310 MHz on my
receive system. This allows me to see my own signal from GB3GW when
I am transmitting. I run an output power of 18 watts at 1280 MHz to
a 35-element Tona antenna with 20dB gain. My receive antenna is a 19
element Sandpiper which is located 30 ft behind the tx antenna and
10ft to the side. The antennas are well separated, however without
the filter I would not be able to see my own picture from GB3GW.
With the filter in circuit I receive GB3GW at P5 at all times. I
would certainly recommend this filter to anyone who wishes to be
able to monitor their signal from a repeater. It also keeps the
front end of my rx clean from other out of band transmissions. Pat,
GW6IMS
Dewi
GW0ABL writes
I operate through GB3TM ATV
repeater on Anglesey, using a Maspro satrx, a pre-amplifier with
16dB gain. My tx is a Worthing Repeater group 1w transmitter with a
18w amplifier. Both my rx and tx antennas are also from the Worthing
group, and located very close to each other. Before I purchased the
band-pass filter from Brian, I could not receive my own signal back
from GB3TM whilst my transmitter was operational. Now with the
filter in circuit I am able to get a P5 signal from GB3TM, when my
transmitter is operational. I would happy recommend this filter to
anyone. Dewi GW0ABL.
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