[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

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

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

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

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

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 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

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

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

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

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