The 8515 has a lot less stability for locking on to weaker frequencies. It can
drift as much as 500 kHz either side of the channel you want to receive. That
is why it is unacceptable to NOAA for use.
They require a 20 kHZ drift or less. With an underpowered signal that NOAAport
has, it can make all the difference.
Gilbert
> On Sep 29, 2022, at 8:10 PM, Robert Firth <robertfirth@xxxxxxxx> wrote:
>
>
> How does the Norsat 8515 compare to the Norsat 3120 or 3420?
>
> Seems like they provide better LO stability, but not better noise
> temperature. But the 3120 and 3420 seem to be significantly more expensive.
>
> I'm using an 8515 paired with a 7.5 ft dish.
>
> Robert Firth
>
>
> From: noaaport <noaaport-bounces@xxxxxxxxxxxxxxxx> on behalf of Gilbert
> Sebenste <gilbert@xxxxxxxxxxxxxxxx>
> Sent: Tuesday, September 27, 2022 6:55 PM
> To: Patrick L. Francis <wxprofessor@xxxxxxxxx>
> Cc: LDM <ldm-users@xxxxxxxxxxxxxxxx>; NOAAPORT <noaaport@xxxxxxxxxxxxxxxx>
> Subject: Re: [noaaport] [ldm-users] lnb
>
> The Norsat 3120 is the best for general purpose use. We have one at
> AllisonHouse, and I like it. But the absolute cream of the crop is the Norsat
> 3420. It offers 2 dB higher gain and a somewhat lower noise figure than the
> 3120. That said, it's more expensive than the 3120.
>
> SSEC used to have an old analog LNA/LNB for their massive dish to receive
> NOAAport. The day they swapped it out for a Norsat 3420, they got a
> jaw-dropping 17 dB gain. Their reception before the switch was awful. Now,
> it's fantastic. As long as you aren't in a very difficult or hostile
> reception environment, the 3120 will serve you very well for many years.
>
> Gilbert Sebenste
> Consulting Meteorologist
> AllisonHouse, LLC
>
>>> On Sep 27, 2022, at 4:43 PM, Patrick L. Francis <wxprofessor@xxxxxxxxx>
>>> wrote:
>>>
>>
>>
>> What is currently considered to be the best LNB for a noaaport setup? I
>> thought I would ask the group before googling around :)
>>
>> cheers,
>>
>> --patrick
>>
>>
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