[time-nuts] Symmetricom SGC-1500

2016-09-21 Thread Julien Goodwin
Can anyone from Symmetricom/Microsemi help me with a firmware image for an SGC-1500 for personal use? I picked this thing up on eBay over a year ago, but only just got around to getting the needed serial adapter bits to talk to it (should anyone else need it, it's rolled from the standard Cisco co

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread David C. Partridge
Looks like all I've managed to do is measure the baseline noise of the analyser. Ho-hum looks like I need something a *lot* quieter to do these measurements. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 18 September

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread David C. Partridge
Yes, I fear a timepod is a bit out of my budget (I can dream tho'). Over here in the UK PN measurement kit is a bit thin on the ground too. So I looked at but that seemed a little thin on details. Or were you referring to something els

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread Dan Rae
On 9/21/2016 8:01 AM, David C. Partridge wrote: Looks like all I've managed to do is measure the baseline noise of the analyser. Ho-hum looks like I need something a *lot* quieter to do these measurements. Indeed Dave, yes. I made the same mistake a few years ago when I tried to compare the

Re: [time-nuts] FS: Spectracom 8140 frequency distribution amps

2016-09-21 Thread IEEE
Hello Joe! How about 100 for them? Thanks, David Jensen W8PDP > On Sep 20, 2016, at 8:55 PM, Joseph Gray wrote: > > More downsizing. > > One unit works 100% (I have been using it for years). It includes the > 5 MHz option board, which I have disabled, for 10 MHz use. I have also > disabled th

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread Dan Rae
On 9/21/2016 9:01 AM, David C. Partridge wrote: Yes, I fear a timepod is a bit out of my budget (I can dream tho'). Over here in the UK PN measurement kit is a bit thin on the ground too. So I looked at but that seemed a little thin o

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread Attila Kinali
On Wed, 21 Sep 2016 09:16:18 -0700 Dan Rae wrote: > On 9/21/2016 9:01 AM, David C. Partridge wrote: > > Yes, I fear a timepod is a bit out of my budget (I can dream tho'). Over > > here in the UK PN measurement kit is a bit thin on the ground too. > > > > So I looked at

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread Chris Caudle
On Wed, September 21, 2016 1:59 pm, Attila Kinali wrote: > On Wed, 21 Sep 2016 09:16:18 -0700 > Dan Rae wrote: >> Pretty much all there, but the FET is hard to find now. > > If you want to build such an amplifier, then the first stage (aka the > jFET input and the first opamp) is the critical

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread Bruce Griffiths
On Wednesday, September 21, 2016 08:59:18 PM Attila Kinali wrote: > On Wed, 21 Sep 2016 09:16:18 -0700 > > Dan Rae wrote: > > On 9/21/2016 9:01 AM, David C. Partridge wrote: > > > Yes, I fear a timepod is a bit out of my budget (I can dream tho'). > > > Over here in the UK PN measurement kit is

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread Gerhard Hoffmann
Am 22.09.2016 um 00:24 schrieb Bruce Griffiths: For the later, Bruce commented that an jFET input stage would probably be more quiet. Gerhard Hoffman has designed a similar I must insist in my second "n" Hoffmann :-) system[3] that uses a couple of paralel low noise opamps instead of a j

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

2016-09-21 Thread Gerhard Hoffmann
Am 22.09.2016 um 00:24 schrieb Bruce Griffiths: Another issue is the requirement to trim the current sink for low output offset. And _that_ FET is made from Unobtainium. If one takes advantage of the fact that the PLL imposes a low frequency cutoff to the PN measurements, the amplifier input

Re: [time-nuts] Lucent RFTFm-II-XO

2016-09-21 Thread Chris Waldrup
Hi, The USB to RS422 adapter arrived. According to the online manual for the adapter, the RS422 signals I'm looking for are: Send A+ Send B- Receive A+ Receive B- Is there a pinout posted somewhere for the Lucent box RS422 D sub 9 connector? Thank you. Chris KD4PBJ > On Sep 14, 2016, at 06

Re: [time-nuts] Inside of FT1200-100

2016-09-21 Thread Ed Palmer
I had to tear apart an FTS1200 that had a broken Dewar. I had trouble getting it apart because that red rubber sheet was bonded to the glass of the Dewar and the oven. Since the Dewar was smashed anyway, I was able to dig the oscillator out by smashing the Dewar even more. You might be able

Re: [time-nuts] Lucent RFTFm-II-XO

2016-09-21 Thread Hal Murray
> Is there a pinout posted somewhere for the Lucent box RS422 D sub 9 > connector? It's in the mail archives. Google for something like >time-nuts RS422 pinout< If you are interested in timing, you want the PPS signal too. (It won't be great over USB, but it might be fun to play with. You c