Looks likes pre-amps have pros and cons. Would another option be to combine the Wilson yagi with another Wilson yagi.
800 Meg preamp
- Thread starter firemantom26
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rbm
Member
That may not be a good thing.
Without a lot of testing to get the phasing harness correct, the signals from the two antennas would be just as likely to cancel each other as they would be to have any additive effect.
Rich
I just may spend the money and buy the
9260A amp. Its low noise amp. What are your thoughts on it...
Pricing and puchasing inforation for low noise 0.4 dB NF HDTV preamplifiers
rbm
Member
I can't help you with that. I have no experience with that brand of amplifier.
The 9260a specifies '470MHz - 806 MHz.'
Does that cover the frequency range you're interested in?
If you already have a Mini Circuits ZQL-1900MLN on the way for the price you mentioned, I don't think you can do much better than that.
Rich
rbm
Member
I looked at the Jefferson County and Ohio database and I see the Ohio MARCS system.
If that's what you're interested in, even though that 'nominally' is referred to as the '800 MHz range'.
.... The actual frequencies used are around 850-855 MHz.
So, if that's what you want to receive, any amplifier you get should cover those frequencies.
Note that this is NOT a recommendation but ... the 9260E is a better match. (per the specifications)
Rich
rbm
Member
If you go that way: (this seems more complicated than it really is)
To get power to the preamp:
I use RG6 cable that has a 'messenger' wire attached.
That's just an insulated copper wire that runs along the coax. I use the messenger wire to carry the +DC.
But any single wire will do.
You can use a ‘Wall Wart’ 12V power supply that will provide at least 500 ma.
At the antenna, use crimp connectors to attach the +DC line (The coax shield carries the –DC)
Then seal the connections with silicone sealer.
For the housing:
I make a weather resistant housing each amp using 2" PVC pipe, an end cap and a pressure testing cap with a hole drilled for the coax and power wires.
For the RF:
You’ll need two of these to connect to your RG6 cable to the SMA connectors on the amplifier.
SMA Male Plug to F Female RF Coax Adapter
(You can find them cheaper from non-US sellers)
You do NOT want any connector that is ‘Reverse Polarity’ or ‘RP’.
SMA Male Plug to F Female RF Coax Connector Adapter | eBay
The ZQL-1900MLN with adapters
The PVC housing I use for my antenna mounted preamps.
(The coax shield carries the negative side of the voltage source.)
Rich
If you go that way: (this seems more complicated than it really is)
To get power to the preamp:
I use RG6 cable that has a 'messenger' wire attached.
That's just an insulated copper wire that runs along the coax. I use the messenger wire to carry the +DC.
But any single wire will do.
You can use a ‘Wall Wart’ 12V power supply that will provide at least 500 ma.
At the antenna, use crimp connectors to attach the +DC line (The coax shield carries the –DC)
Then seal the connections with silicone sealer.
For the housing:
I make a weather resistant housing each amp using 2" PVC pipe, an end cap and a pressure testing cap with a hole drilled for the coax and power wires.
For the RF:
You’ll need two of these to connect to your RG6 cable to the SMA connectors on the amplifier.
SMA Male Plug to F Female RF Coax Adapter
(You can find them cheaper from non-US sellers)
You do NOT want any connector that is ‘Reverse Polarity’ or ‘RP’.
SMA Male Plug to F Female RF Coax Connector Adapter | eBay
The ZQL-1900MLN with adapters
The PVC housing I use for my antenna mounted preamps.
(The coax shield carries the negative side of the voltage source.)
Rich
Thanks Rick for all the information!!!!!!!
I have decided and ordered 100 ft of LMA-400 with N connectors vs going with preamp to help improve the
800 megahertz.......
Chart below DB loss..
Coax Attenuation Chart
800 megahertz.......
Chart below DB loss..
Coax Attenuation Chart
A buddy and I did the install and it made a world of difference......................
Hope it works for me. I just ordered 50' of LMR400, and two N to F adapters, for my 1090 Mhz aircraft monitoring antenna. Been using 50' of RG6 with limited results. Figured I would try your idea before spending big bucks on a preamp. If the results arent that much improved, I can use the coax for my ST2 scanner antenna instead.
Different types of Coaxial cable have different attenuation per foot of run so it depends on which type of cable you use. The longer run the better coax you need. RG6 is 75 ohm and LMR400 is 50 ohm.
LMR400 is about two DB better gain on a 100 ft run monitoring 800mhz
LMR400 is about two DB better gain on a 100 ft run monitoring 800mhz
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