Greetings. I am new to the group and hope that I can glean a wealth of
wisdom
from the collective.

I have a dilemma.

I propose to operate 6 or 7 five watt FM transmitters on different
frequencies.
This is in another country where FM bandwidth is fairly open so it
will be possible
to space operating frequencies far apart. I do not need to transmit
very far (300 meters
maximum) and not for very long periods of time (5 minute events). The
surrounding
area is not heavily populated.

I will be transmitting from one location and I hope to minimize
interference between
antennas and broadcast equipment (I am using a multiple output
interface connected
to a laptop). The transmitters are a very small Chinese build PLL...
not the best
in the West (or East). And the antennas are tuneable 1/4 wave with
ground plane radials.

I would like to 1). be able to connect all transmitters to the same
regulated power supply
(13.5V DC) and 2). use the minimum lengths of cabling due to weight
considerations.

I am not concerned about much loss of efficiency as the distance
needed to throw is
well within the capability of the transmitter strength.

Does anybody have any recommendations for spacing, orientation, power
considerations?
And any idea approximately how many amps a 5watt transmitter might
pull from the power
supply?

Sorry for my naivete or ignorance and thank you anyone who cares to
shed light on this
dilemma.
yours,
robb kunz

at 5w from a 12v supply plan on 1a for each transmitter, maybe more if they
have lots of lights and are inefficient. at worst probably 2a each. at 5w
each they probably won't bother each other much, but its probably best to
keep the antennas a few feet from the computer anyway. as far as the
transmitters you can probably pile them up on top of each other unless they
need room for air circulation, though for short times and only 5w they can't
need much cooling unless they are really tiny.


"inphaseprod" wrote in message
oups.com...
Greetings. I am new to the group and hope that I can glean a wealth of
wisdom
from the collective.

I have a dilemma.

I propose to operate 6 or 7 five watt FM transmitters on different
frequencies.
This is in another country where FM bandwidth is fairly open so it
will be possible
to space operating frequencies far apart. I do not need to transmit
very far (300 meters
maximum) and not for very long periods of time (5 minute events). The
surrounding
area is not heavily populated.

I will be transmitting from one location and I hope to minimize
interference between
antennas and broadcast equipment (I am using a multiple output
interface connected
to a laptop). The transmitters are a very small Chinese build PLL...
not the best
in the West (or East). And the antennas are tuneable 1/4 wave with
ground plane radials.

I would like to 1). be able to connect all transmitters to the same
regulated power supply
(13.5V DC) and 2). use the minimum lengths of cabling due to weight
considerations.

I am not concerned about much loss of efficiency as the distance
needed to throw is
well within the capability of the transmitter strength.

Does anybody have any recommendations for spacing, orientation, power
considerations?
And any idea approximately how many amps a 5watt transmitter might
pull from the power
supply?

Sorry for my naivete or ignorance and thank you anyone who cares to
shed light on this
dilemma.
yours,
robb kunz

On Jul 8, 5:10?pm, inphaseprod wrote:
Greetings. I am new to the group and hope that I can glean a wealth of
wisdom
from the collective.

I have a dilemma.

I propose to operate 6 or 7 five watt FM transmitters on different
frequencies.
This is in another country where FM bandwidth is fairly open so it
will be possible
to space operating frequencies far apart. I do not need to transmit
very far (300 meters
maximum) and not for very long periods of time (5 minute events). The
surrounding
area is not heavily populated.

I will be transmitting from one location and I hope to minimize
interference between
antennas and broadcast equipment (I am using a multiple output
interface connected
to a laptop). The transmitters are a very small Chinese build PLL...
not the best
in the West (or East). And the antennas are tuneable 1/4 wave with
ground plane radials.

I would like to 1). be able to connect all transmitters to the same
regulated power supply
(13.5V DC) and 2). use the minimum lengths of cabling due to weight
considerations.

I am not concerned about much loss of efficiency as the distance
needed to throw is
well within the capability of the transmitter strength.

Does anybody have any recommendations for spacing, orientation, power
considerations?
And any idea approximately how many amps a 5watt transmitter might
pull from the power
supply?

Sorry for my naivete or ignorance and thank you anyone who cares to
shed light on this
dilemma.
yours,
robb kunz

Hi Robb, As for power supplies, to run 7-5 watt input transmitters,
you will need at a minimum a 13.5 volt 3 amp supply. This is a 40-50
watt supply. Check the name plate of the supply you intend to use to
see if it will work.

No recommendations on spacing or orentation of antennas, just try and
see what works.
73 Gary N4AST

"inphaseprod" wrote in message
oups.com...
Greetings. I am new to the group and hope that I can glean a wealth of
wisdom
from the collective.

I have a dilemma.

I propose to operate 6 or 7 five watt FM transmitters on different
frequencies.
This is in another country where FM bandwidth is fairly open so it
will be possible
to space operating frequencies far apart. I do not need to transmit
very far (300 meters
maximum) and not for very long periods of time (5 minute events). The
surrounding
area is not heavily populated.

I will be transmitting from one location and I hope to minimize
interference between
antennas and broadcast equipment (I am using a multiple output
interface connected
to a laptop). The transmitters are a very small Chinese build PLL...
not the best
in the West (or East). And the antennas are tuneable 1/4 wave with
ground plane radials.

I would like to 1). be able to connect all transmitters to the same
regulated power supply
(13.5V DC) and 2). use the minimum lengths of cabling due to weight
considerations.

I am not concerned about much loss of efficiency as the distance
needed to throw is
well within the capability of the transmitter strength.

Does anybody have any recommendations for spacing, orientation, power
considerations?
And any idea approximately how many amps a 5watt transmitter might
pull from the power
supply?

Sorry for my naivete or ignorance and thank you anyone who cares to
shed light on this
dilemma.
yours,
robb kunz

5 W will give you a range of about 30 KM. If I understand you correctly, you
want to transmit 300 meters. 0.1 W seems to be about right, and that may be
too much.

Tam/WB2TT