[time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Bob kb8tq kb8tq at n1k.org
Fri May 18 14:53:28 EDT 2018


What you really want is an LNA plus some filtering. MiniCircuits will sell you all sorts of 
“adequate” amplifiers. They show up surplus for reasonable prices. The key point is that 
ultra low noise figure it not needed. A 3db NF is just as good as 0.3 db in this case. The
antenna sets the noise for the system. ( unless you *really* run out of gain).


> On May 18, 2018, at 2:48 PM, Gary E. Miller <gem at rellim.com> wrote:
> Ole!
> On Fri, 18 May 2018 20:31:22 +0200
> Ole Petter Rønningen <opronningen at gmail.com> wrote:
>> Just a heads up, in case you’re not concious of the fact; at least my
>> HP splitter (can’t recall model# off hand) is strictly L1 - many
>> others are wide band and will allow L2 and whatever else you might
>> later want.
> I have had good luck with cheap chinese wide-band splitters.  No problems
> with L1, L2, GLONASS and more.
> Like this one for $23:
> https://www.ebay.com/itm/RF-coaxial-Power-Splitter-Divider-Combiner-SMA-2-way-800-2500MHz-signal-booster/282970977753
> Also, mostly good luck with cheap Chinese DC injectors.  Some have had
> bad solder joints, easily fixed.
> These have been good, for $9:
> https://www.aliexpress.com/item/RF-Isolator-Bias-Feeder-Bias-Tee-10MHz-3GHz/32848444588.html
> What I have not had luck with yet is finding a cheap LNA so I can recover
> the gain lost in the splitters.  The ones I have tested so far have all
> seriously degraded my SNRs.
> Anyone know of a cheap and good L1/L2/etc. LNA?
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
> 	gem at rellim.com  Tel:+1 541 382 8588
> 	    Veritas liberabit vos. -- Quid est veritas?
>    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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