cpetraglia
Member
Has anyone found a quality preamp for the 700/800 PS band. There are plenty for each separate band, but I have been unable to find one that covers both.
Dedicated 700/800 pre-amp
- Thread starter cpetraglia
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rbm
Member
I use several Mini-Circuits ZQL-1900MLN pre-amps for that range.
This list price ( new ) is $265.
BUT ...... you can find them on ebay for less than $100.
I see one on there now for around $89 new.
Even though the specs are for 1850-1910 MHz, they perform very well down to around 450 MHz.
Around 700-800 MHz the noise figure is close to 1.0 dB and gain is around 28 dB.
Here's a test of one of mine.
This is what the amp looks like:
You can find the specs (in PDF format) can be found here:
www.directdatasheet.com/part_detail.php?part=ZQL-1900MLN&mfg=MINI-CIRCUITS
Rich
Some additional spare pre-amps.
This list price ( new ) is $265.
BUT ...... you can find them on ebay for less than $100.
I see one on there now for around $89 new.
Even though the specs are for 1850-1910 MHz, they perform very well down to around 450 MHz.
Around 700-800 MHz the noise figure is close to 1.0 dB and gain is around 28 dB.
Here's a test of one of mine.
This is what the amp looks like:
You can find the specs (in PDF format) can be found here:
www.directdatasheet.com/part_detail.php?part=ZQL-1900MLN&mfg=MINI-CIRCUITS
Rich
Some additional spare pre-amps.
Last edited:
cpetraglia
Member
Unfortunately, that's way too much gain for my needs. I would never buy a used pre-amp form Ebay. Who knows what its been through. I am looking for something in the 760 to 870 range. I need to keep it tight.
Thanks
Thanks
I've used the Mini-Circuits ZX60-0916LN-S with excellent results. Specs state 824-960 MHz, but I've found them to work well below (and above) their specified range. And, they are inexpensive.
https://www.minicircuits.com/WebStore/dashboard.html?model=ZX60-0916LN-S+
https://www.minicircuits.com/WebStore/dashboard.html?model=ZX60-0916LN-S+
cpetraglia
Member
I have tried my Stridsberg 806-896 and it completely cuts off 775Mhz. I suppose I can use a broadband 5-1000 and see what happens. I just don't see the point of amplifying VHF and UHF when I don't need it. All it will do is de-sensitize the radios.
Thanks
Thanks
Since the 700/800 band(s) are used on the same systems, there should be plenty or commercial grade equipment for these systems. It may take a little bit to flow down into the used market.
I have heard that this company makes some good products but have never dealt with them:
Low noise preamplifiers and microwave Gunnplexers
chris
I have heard that this company makes some good products but have never dealt with them:
Low noise preamplifiers and microwave Gunnplexers
chris
cpetraglia
Member
I am working with them right now on a custom pre-amp. They don't currently have anything in that range.
I have many pre-amps from them and they are great.
I have many pre-amps from them and they are great.
If you can post your results, that would be great. The CT Statewide system will be a 700/800 mix in the near future and I will be replacing several splitters/amps
cpetraglia
Member
Will be happy to.
Chuck
Chuck
I've used this
Ultra Linear Low Noise Amplifier PGA-103 10MHz - 2GHz LNA Gain 20dB; NF 0.5 dB
But with a scanner, it seems to overload the front end and makes it worse (at least in my high RF environment). However, I tried it with a commercial receiver with a yagi and it made a big difference on an 800 system in the next state.
Ultra Linear Low Noise Amplifier PGA-103 10MHz - 2GHz LNA Gain 20dB; NF 0.5 dB
But with a scanner, it seems to overload the front end and makes it worse (at least in my high RF environment). However, I tried it with a commercial receiver with a yagi and it made a big difference on an 800 system in the next state.
cpetraglia
Member
I tend to be a little weary of a noise factor of .5 db on a cheap amp. If you get a professional grade amp with a NF that low, your looking at $125.00. I just don't want a 2 Ghz wide open bandwidth.
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