[time-nuts] GPSDO energy consumption question(s)

Bob Camp kb8tq at n1k.org
Fri Aug 28 20:29:15 EDT 2015


The GPSTM (and similar) have at least one other “fatal flaw” compared to the TBolt - 
You can not tune the filter (control loop) parameters. That locks you in to the “big hump” 
Trimble ADEV that their default settings create. 

If I was stuck on a solar battery stack, I think I’d prefer the GPSTM’s wide range switcher
over the linear regulators that are needed to make a TBolt run nicely :)

There is always the possibility that another “wave” of TBolts might show up. I doubt they
will drop back to the $120 range again. It looks like something around 2X to 3X that is now the
going rate. Who knows …..


> On Aug 28, 2015, at 7:04 PM, skipp Isaham via time-nuts <time-nuts at febo.com> wrote:
> Greetings Time Nuts Group Members  
> A few quick questions regarding the Trimble Thunderbolt and similar GPSDO 
> unit power consumption. 
> I've obtained and currently use the Thunderbolt GPSDO having the case top 
> power connector requiring a triple output supply. Being very happy with the 
> operation and performance of the mentioned, I'd like to find one or two more. 
> However, the online auction prices for the Thunderbolt GPSDO model I like have 
> risen quite a bit. 
> As what I thought might be a possible price and availability alternative, started 
> evaluating the Nortel NTBW50AA GPSTM GPS Timing Module. 
> The Nortel NTBW50AA GPSTM GPS Timing Module compared to the Thunderbolt 
> seems to be a bit of an "energy hog". I don't yet have enough information 
> to do a total comparison of other available GPSDO options. 
> Would any of you be able to provide a quick relative comparison about relatively 
> common (surplus) GPSDO and similar type/function units?  their real world 
> energy consumption? 
> The Nortel NTBW50AA GPSTM is nice but I'm not sure we'd want to park one 
> at a solar only location that didn't need what appears to be a mini space 
> heater. 
> Thank you in advance for your replies...  
> regards, 
> skipp025 at yahoo.com 
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