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Frequently
Asked Questions |
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| Answers to the questions we get asked
most often. Ask
us if you have any questions not answered below. |
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| Q: How many Bias-T (DC Inserters)
and PDU's do I need for a TMA?
A: For Single TMAs you will need one DC
Inserter. For Twin TMAs you will need two DC Inserters.
One CA484 PDU can supply 6 DC Inserters.
Therefore you can control 6 single TMAs , or 3 Twin
TMAs from one CA484 PDU.
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| Q: What is a MHA,
TTLNA, or LNA?
A: Tower Mounted Amplifiers (TMA) are also know
as:
 | Masthead Amplifiers (MHA) |
| Tower Top Amplifiers (TTA) |
| Tower Top Low Noise Amplifiers (TTLNA) |
| Low noise Amplifiers (LNA) |
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| Q: I have surge protectors, where do I place the Bias T?
A: The DC Inserter (BiasT) is used to provide DC
voltage to the TMA. Placement of the DC Inserter in the
system will depend on if the surge protector has DC Bypass.
| If surge protector has NO DC Bypass: - The DC
Inserter will need to be installed between the surge protector
and the antenna (In the Red circle). |
| If surge protector has DC bypass:- The DC Inserter
can be installed anywhere between the BTS and the antenna. |
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| Q: I want to buy a combiner. What other information should I
be looking at?
A: Questions that should be asked about
combiners are:
| What frequency range is needed? - I like them to give the exact band edge frequencies
(e.g
890.5 to 915.2MHz), because many operators tend to mix bands and
frequencies in non-standard configurations. |
| What insertion loss is required? |
| What power rating is required? |
| Do you need indoor or outdoor equipment? -
This will also depend on the shelter configurations, etc. |
| What connectors are they using? - 7/16"
connectors are standard |
| Are there any special rejection/response requirements? |
| How many units are required? |
| What delivery time? |
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| Q: I want to buy a
TMA. What other equipment will I need?
A: As a minimum you will need a Power
Distribution Unit (PDU) which supplies volts for the amplifier, and a
Bias T (DC Inserter) which is used to insert the voltage for the
amplifier into the coaxial cable. A Twin TMA needs two BiasT's.
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