Splitting a single UHF aerial feed at two different points
 

I need to split a single UHF aerial feed at two different points.
Normally when splitting, I'd install an amplifier with dual-outputs,
but if there are two splits, this would involve two dual-output
amplifiers being daisy-chained.
I've experimented with a couple of old Labgear amps, and found that
using them in a daisy-chain configuration causes major signal
degredation.

Is there any special kit available for this task?

Thanks in advance.

Splitting a single UHF aerial feed at two different points
 

In message
, Zudo
writes

I need to split a single UHF aerial feed at two different points.
Normally when splitting, I'd install an amplifier with dual-outputs,
but if there are two splits, this would involve two dual-output
amplifiers being daisy-chained.
I've experimented with a couple of old Labgear amps, and found that
using them in a daisy-chain configuration causes major signal
degredation.

Is there any special kit available for this task?

Thanks in advance.

You only need an amplifier if you haven't got enough signal level to
split it.

A 'proper' 2-way splitter will drop the signal level by about 4dB at
each output, so if you follow one splitter with another, you will have
about 8dB less signal at the output of the second split. [Plus cable
losses, of course.] That's a lot to lose, but if you're getting a
whacking great signal off the aerial, it will still work.

On the other hand, if you feel that you need some amplification (if only
to make up for the splitting losses), you could use your favourite
dual-output amplifier for the first split, and passive splitter for the
second. I can't see you needing a second amplifier. And unless you're
also trying to make up for lots of cable loss, you probably won't need
much amplification - just sufficient to overcome the splitting losses.
--
Ian

Splitting a single UHF aerial feed at two different points
 

"Ian Jackson" wrote in message
...
In message
, Zudo
writes

I need to split a single UHF aerial feed at two different points.
Normally when splitting, I'd install an amplifier with dual-outputs,
but if there are two splits, this would involve two dual-output
amplifiers being daisy-chained.
I've experimented with a couple of old Labgear amps, and found that
using them in a daisy-chain configuration causes major signal
degredation.

Is there any special kit available for this task?

Thanks in advance.

You only need an amplifier if you haven't got enough signal level to split
it.

A 'proper' 2-way splitter will drop the signal level by about 4dB at each
output, so if you follow one splitter with another, you will have about
8dB less signal at the output of the second split. [Plus cable losses, of
course.] That's a lot to lose, but if you're getting a whacking great
signal off the aerial, it will still work.

On the other hand, if you feel that you need some amplification (if only
to make up for the splitting losses), you could use your favourite
dual-output amplifier for the first split, and passive splitter for the
second. I can't see you needing a second amplifier. And unless you're also
trying to make up for lots of cable loss, you probably won't need much
amplification - just sufficient to overcome the splitting losses.
--
Ian

All agreed, plus
If the daisychaining of two relatively low gain amps causes 'major signal
degredation' then something's wrong. If the input signal levels are correct
and reasonably level there shouldn't be a noise/crossmod problem.

Bill

Splitting a single UHF aerial feed at two different points
 

On Jul 2, 4:28 pm, "Bill Wright" wrote:
"Ian Jackson" wrote in message

...



In message
, Zudo
writes

I need to split a single UHF aerial feed at two different points.
Normally when splitting, I'd install an amplifier with dual-outputs,
but if there are two splits, this would involve two dual-output
amplifiers being daisy-chained.
I've experimented with a couple of old Labgear amps, and found that
using them in a daisy-chain configuration causes major signal
degredation.

Is there any special kit available for this task?

Thanks in advance.

You only need an amplifier if you haven't got enough signal level to split
it.

A 'proper' 2-way splitter will drop the signal level by about 4dB at each
output, so if you follow one splitter with another, you will have about
8dB less signal at the output of the second split. [Plus cable losses, of
course.] That's a lot to lose, but if you're getting a whacking great
signal off the aerial, it will still work.

On the other hand, if you feel that you need some amplification (if only
to make up for the splitting losses), you could use your favourite
dual-output amplifier for the first split, and passive splitter for the
second. I can't see you needing a second amplifier. And unless you're also
trying to make up for lots of cable loss, you probably won't need much
amplification - just sufficient to overcome the splitting losses.
--
Ian

All agreed, plus
If the daisychaining of two relatively low gain amps causes 'major signal
degredation' then something's wrong. If the input signal levels are correct
and reasonably level there shouldn't be a noise/crossmod problem.

Bill

Well the amps I tested were old ones - they possibly aren't working as
they should.
The property is a listed building with three storeys and a loft-
mounted aerial. The coax passes through two bedrooms on the first and
second floors, then feeds a single TV in the ground floor lounge. The
owner (my aunt) wants additional TVs in each of the bedrooms.
Signal strength is modest - enough to give a perfect analogue picture
on a single TV, but any splitting results in fuzzyness.
I wondered if there was a special amp I could install on the 2nd
floor, which had two outputs - one at 'normal' strength, and another
at '2x normal' strength which would be suitable for splitting on the
floor below?

Splitting a single UHF aerial feed at two different points
 

"Zudo" wrote in message
...

I need to split a single UHF aerial feed at two different
points.
Normally when splitting, I'd install an amplifier with
dual-outputs,
but if there are two splits, this would involve two dual-output
amplifiers being daisy-chained.
I've experimented with a couple of old Labgear amps, and found
that
using them in a daisy-chain configuration causes major signal
degredation.

Is there any special kit available for this task?

Thanks in advance.




Get an amp that has a couple of 'normal' outputs and one
high-level output, then use a passive splitter (£8.72 from
Screwfix) on the high level output. Alternatively get a single
output high-gain amp and the use a 4-way passive splitter.


--
Woody

harrogate three at ntlworld dot com

Splitting a single UHF aerial feed at two different points
 

Why not just split it three ways in the first place?
Brian

--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email:
__________________________________________________ __________________________________________________ __________


"Zudo" wrote in message
...

I need to split a single UHF aerial feed at two different points.
Normally when splitting, I'd install an amplifier with dual-outputs,
but if there are two splits, this would involve two dual-output
amplifiers being daisy-chained.
I've experimented with a couple of old Labgear amps, and found that
using them in a daisy-chain configuration causes major signal
degredation.

Is there any special kit available for this task?

Thanks in advance.