Re: [time-nuts] Old xtal filter

Look up the Collins CV-157. This 1950s unit converted the IF output of an R-390 receiver into upper and lower sidebands, which could be further demodulated by existing land line multiplexing techniques, such as 4 RTTY on each sideband. It heterodyned the R-390 IF to 100 KC and filtered that with a

Re: [time-nuts] A Very Interesting "Plock"

Locally, I am regularly enthralled by the Glen Echo Wurlizer 165 Band Organ (a different unit but a good video showing how it is driven by multiple parallel paper tapes: https://www.youtube.com/watch?v=tMj6duvFJ4o ) But the digit writing of this clock is captivating, and brings to mind some

Re: [time-nuts] Need info on a Vectron Model : 233-8346 OCXO

Hi >From a quick look at Mr Google: >From the base part number (233) they are low cost un-compensated sine wave >XO’s. They run of something like 12 to 15V and put out about +7 dbm. Phase >noise (by todays standards) is “nothing special”. The harmonics are what any >recient thread on the

Re: [time-nuts] Old xtal filter

Hi > On Mar 6, 2016, at 8:15 PM, Magnus Danielson > wrote: > > Hi, > > On 03/07/2016 12:42 AM, Poul-Henning Kamp wrote: >> >> In message >> >> , Joseph Gray writes: >> >>> Assuming I

[time-nuts] Need info on a Vectron Model : 233-8346 OCXO

Gents I have just gotten 2 Vectron model 233-8346 OCXO's , a 10Mhz & a 100Mhz. They have 2 pins & the case (moght be a 3'rd) , and a BNC for F-Out. I have absolutely no info of these ,and have spent a lot of time searching on the "net". Can anyone help me with some info (datasheet) on this

Re: [time-nuts] Old xtal filter

Hi, On 03/07/2016 12:42 AM, Poul-Henning Kamp wrote: In message , Joseph Gray writes: Assuming I made the pictures small enough, attached are two images of an very old crystal filter that a friend found. The strange

Re: [time-nuts] Old xtal filter

Hi The bandwidth *was* 10 Hz (or 10 cps) when it was made. Who knows what it is after 5 decades of aging. Same goes for the center frequency. It’s not uncommon to see solder sealed crystals in low frequency filters. If they age 5 ppm per year, that’s doing pretty well. At 100 KHz, 5 ppm is

Re: [time-nuts] Old xtal filter

Actually, the bandwidth is 10 Hz not 100 Hz. Joseph Gray wrote: > Assuming I made the pictures small enough, attached are two images of > an very old crystal filter that a friend found. The strange thing > about it is the bandwidth - 100 Hz. What could this have been used

Re: [time-nuts] Old xtal filter

In message , Joseph Gray writes: >Assuming I made the pictures small enough, attached are two images of >an very old crystal filter that a friend found. The strange thing >about it is the bandwidth - 100 Hz. What could

Re: [time-nuts] Old xtal filter

Hi Also consider that the filter is *very* old. The logo is probably from >50 years ago. That makes the gizmo a “tube era” sort of part. CTS bought Knights in 1964 and the logo changed after that. The part in the picture is serial number two. There may not have been very many gizmos that used

Re: [time-nuts] Old xtal filter

Old James Knight product (west of me in Sandwich, IL) Actually, the Frequency is 100 kHz (common for calibrators in analog receivers), with a Bandwidth of 10 Hz. Since they used Cycles, instead of Hertz, that will help to date the item (as well as JK logo). Sent from iPad Air

Re: [time-nuts] Old xtal filter

Joe, if I read correct, the BW of this filter is only 10 Hz (cps), not 100 Hz, @ carrier frequency of 100 kHz. Such a low bandwidth is useful to work with very faint signals. The low BW reduces noise, but the received signal must be very slow to pass the filter and the transmitter/ receiver

Re: [time-nuts] Old xtal filter

- Original Message - From: "Joseph Gray" To: "Discussion of precise time and frequency measurement" Sent: Sunday, March 06, 2016 2:31 PM Subject: [time-nuts] Old xtal filter Assuming I made the pictures small enough, attached are two images

Re: [time-nuts] Old xtal filter

Joe, if I read correct, the BW of this filter is only 10 Hz (cps), not 100 Hz, @ carrier frequency of 100 kHz. Such a low bandwidth is useful to work with very faint signals. The low BW reduces noise, but the received signal must be very slow to pass the filter and the transmitter/ receiver

Re: [time-nuts] Positioning Accuracy - Lady Heather vs. T-Bolt Monitor

Hi The data is as accurate as the TBolt it’s self. The device can use the extra digits. The utility of a more accurate position has been verified in the past. Simple math: Each meter you are off is 3 ns. In a worst case situation you could get 6 ns of “ripple” as the constellation moved

Re: [time-nuts] Old xtal filter

Label sez B/W is actually 10cps or 10Hz, not 100. Could have been used in a carrier recovery scheme in a DSB/ISB receiver. These typically had three IF filters, one for carrier recovery and one each for USB and LSB. DaveB, NZ - Original Message - From: "Joseph Gray"

Re: [time-nuts] Old xtal filter

On Sun, 6 Mar 2016 12:31:47 -0700, you wrote: >What could this have been used >for, with such a narrow bandwidth? Removing spurs from a 100Kc standard, perhaps? -- Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic Zone 5/4 in upstate New York, 1420' elevation. NY

Re: [time-nuts] Old xtal filter

Hi again Joe, As I read it, it's a 100 kHz 10 Hz BW filter. Very narrow. Cheers, Magnus On 03/06/2016 08:31 PM, Joseph Gray wrote: Assuming I made the pictures small enough, attached are two images of an very old crystal filter that a friend found. The strange thing about it is the bandwidth

Re: [time-nuts] Old xtal filter

Hi > On Mar 6, 2016, at 2:31 PM, Joseph Gray wrote: > > Assuming I made the pictures small enough, attached are two images of > an very old crystal filter that a friend found. The strange thing > about it is the bandwidth - 100 Hz. What could this have been used > for, with

Re: [time-nuts] Old xtal filter

Hi, Is that 100Hz por 10cps? Seems like a CW filter for a 100Khz IF - Ex 500Khz Marine RX? Cheers, Will On 07/03/16 08:31, Joseph Gray wrote: Assuming I made the pictures small enough, attached are two images of an very old crystal filter that a friend found. The strange thing about it is

Re: [time-nuts] Old xtal filter

Hi Joe, Oh, that one is for CW, to cut away as much noise as possible. 150 and 300 Hz has also been seen. Cheers, Magnus On 03/06/2016 08:31 PM, Joseph Gray wrote: Assuming I made the pictures small enough, attached are two images of an very old crystal filter that a friend found. The

[time-nuts] Positioning Accuracy - Lady Heather vs. T-Bolt Monitor

Hello Time Nuts -My question is --- both LH and T-Bolt Mon will readout position during andat the conclusion of a self survey.The readout from LH provides 2 additional digits of resolution compared to T-bolt Monitor.That is LH provides 7 digits of Lat or Lon to the right of the decimal point;

Re: [time-nuts] Oscope Tutorial

Perrier -- Ok, I've uploaded your Word/PDF document to Didier's site (ko4bb.com). You can see the pending file under http://www.ko4bb.com/cgi-bin/viewlog.pl At some point KO4BB will approve and move it to the searchable manual download area. I don't know if this takes days or weeks. In the

[time-nuts] A Very Interesting "Plock"

Hi all, I saw this article about a hand-made clock, and thought some of you might enjoy it. Called the Plock (plot clock), it is a 407-piece wooden clock that writes the time. You really just have to see it in action to appreciate it.

Re: [time-nuts] MTI 260-0624-D OCXO

Mike, Ouch! Not opening before they say OK seems like a good strategy. I just wanted to share that little story even if it doesn't help you. It was worse when I got a BVA with *crushed* thermo-flask. I was actually given a replacement thermo-flask within a few days from OSA. Cheers, Magnus