[time-nuts] Microsemi XLi SAASM

[Björn]

Hi,

With keys loaded, PPS GPS receivers can access the 10.23MHz encrypted P(Y) spreading code signals on both L1 and L2.

Without keys only the 1.023MHz unencrypted C/A spreading code signal on L1 is available.

The two main benefits for a keyed receiver are

1) resistance to spoofing, since the spoofer can not generate a correct “encrypted” signal and 

2) increased resistance to interference/jamming due to having access to 20 times the bandwidth of C/A divided on two different frequencies.

Further benefit is the somewhat increased accuracy due to dual frequency ionospheric compensation.

/Björn

Sent from my iPhone

>>> On 28 Mar 2020, at 23:01, kb8tq at n1k.org wrote:
>> Hi
>> 
>> Just a guess, but I'd bet the answer is no. 
>> 
>> The only reason the SAASM receivers play with L2 is to demodulate the encrypted 
>> military signal with the proper key. There is no need to do the "fake out" reception
>> that the old style survey receivers did on L2. With no need to do it (and likely no survey
>> data interface to report the results) .... no function in the device. 
>> 
>> That's just a guess based on no direct knowledge of what's what with the device.
>> 
>> Bob
>> 
>> 
>> 
>> -----Original Message-----
>> From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of Tom Knox
>> Sent: Saturday, March 28, 2020 1:29 PM
>> To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
>> Subject: Re: [time-nuts] Microsemi XLi SAASM
>> 
>> Hi Mike;
>> Quick question, do the SAASM receives work as simple L1-L2 standard recovers without the Key?
>> Sadly there is no company more protective of their product information then Microsemi.
>> Sadly Microsemi is clearly in the camp of stockholder driven rather then customer driven.
>> I have spent decades looking for a service manuals for the 1050A and 5071A with no luck.
>> I feel sorry for many of the employees that have worked there for decades and are limited by the short sighted policies limiting the sharing of information in recent decades by so many test and measurement companies.
>> Thanks;
>> 
>> Tom Knox
>> 
>> 303-554-0307
>> 
>> actast at hotmail.com
>> 
>> "Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein
>> 
>> ________________________________
>> From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of MIKE ELDRIGE <mike.eldrige at msn.com>
>> Sent: Saturday, March 28, 2020 12:00 AM
>> To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
>> Subject: Re: [time-nuts] Microsemi XLi SAASM
>> 
>> Steve,
>> There is no jumpers for the antenna voltage.
>> I have 2 saasm units and have many Xli units for parts which I would sell
>> Thanks, Mike
>> Some time give me a call and I can help what I can.
>> Very Best, Mike
>> 
>> -----Original Message-----
>> From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of Steve - Home
>> Sent: Friday, March 27, 2020 6:11 PM
>> To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
>> Subject: Re: [time-nuts] Microsemi XLi SAASM
>> 
>> Absolutely, but I’m hoping the XLi, like some of the later receivers, has a method to select the antenna voltage.
>> 
>> Steve
>> 
>> 
>> 
>> 
>>> On Mar 27, 2020, at 8:06 PM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
>> You could easily do what you want without modifying the receiver,
>> using a
>> 7805 or similar
>> regulator and a pair of bias tees, inserted in the transmission line
>> from the antenna.
>> Dana
>>>>> On Fri, Mar 27, 2020 at 7:33 PM Steve - Home <steve-krull at cox.net> wrote:
>>> I wondered if anyone has a user and/or service manual for the XLi SAASM?
>>> Or any of the option modules? The one I received appears to have had
>>> the L2 receiver removed. I’d also like to see if there’s a jumper or
>>> software setting to change the antenna supply voltage from 12v to 5v.
>>> Thanks for any assistance!
>>> Steve
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