Hi Didier, Yes, the 440Hz is primarily a reference for tuning musical instruments or calibrating tuners (i.e. PC sound cad based). In doing a little "market research" as to the free frequency service, this freq. was preferred to the normal 500Hz or 600Hz and still just within analog telephone bandwidth.
Kind Regards, -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: 18 July 2008 14:15 To: [email protected] Subject: time-nuts Digest, Vol 48, Issue 47 Send time-nuts mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to [EMAIL PROTECTED] You can reach the person managing the list at [EMAIL PROTECTED] When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics: 1. Re: Power splitter on the Thunderbolt units (Tom Van Baak) 2. Re: Power splitter on the Thunderbolt units (David Ackrill) 3. AUSTRON LORAN-C TRF RECEIVER MODEL 2082 (Stanley Reynolds) 4. Re: Lucent RFTG-m-RB (Scott Mace) 5. Re: Thunderbolt monitor ([EMAIL PROTECTED]) 6. Re: Thunderbolt monitor ([EMAIL PROTECTED]) 7. Re: Thunderbolt monitor (Neville Michie) 8. change in email address ([EMAIL PROTECTED]) 9. TimeNuts Assistance Request (Baragwanath, Chris (TSG)) 10. Re: TimeNuts Assistance Request (Didier Juges) ---------------------------------------------------------------------- Message: 1 Date: Thu, 17 Jul 2008 09:31:51 -0700 From: "Tom Van Baak" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Power splitter on the Thunderbolt units To: "Discussion of precise time and frequency measurement" <[email protected]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=original > What is the power splitter glued on some of the Thunderbolt units meant for ? > Apparently it is good up to 500 MHz, so it can't be used for the signal coming from the antenna. > Maybe it was just part of complete product which the Thunderbolt was part of. > Just curious.... > > 73 Alberto I2PHD It was used with the 10 MHz output; either to split the output or to combine with a phased locked 10 MHz backup source (we've seen this on other telecom frequency references). Some of the Thunderbolts in the group buy had the splitter removed (those with screws from the outside). Others came with splitters screwed from the inside and it was too much bother to remove the splitter from each unit before shipment. You can remove the thing yourself by opening up the case. /tvb ------------------------------ Message: 2 Date: Thu, 17 Jul 2008 18:10:37 +0100 From: David Ackrill <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Power splitter on the Thunderbolt units To: Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Tom Van Baak wrote: > > It was used with the 10 MHz output; either to split the output or to > combine with a phased locked 10 MHz backup source (we've seen this on > other telecom frequency references). Sounds like a nice little 'freebe' for some. :-) I can understand that it would be better to remove it to keep P&P costs under control though. Dave (G0DJA) ------------------------------ Message: 3 Date: Thu, 17 Jul 2008 12:05:47 -0700 (PDT) From: Stanley Reynolds <[EMAIL PROTECTED]> Subject: [time-nuts] AUSTRON LORAN-C TRF RECEIVER MODEL 2082 To: [email protected] Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=iso-8859-1 Any info available ? ? Name is a little misleading as this unit is?RF filters and preamp. ? Contains?4 adjustable?filters first is switch selectable for peek or null, other 3 are null, and one band pass filter 29Khz to 100Khz. May be similar to 2084 Multifilter one output shared between front and rear panels and no Sferics warning lamp . ------------------------------ Message: 4 Date: Thu, 17 Jul 2008 16:43:20 -0500 From: Scott Mace <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Lucent RFTG-m-RB To: Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed When you have a RFTG-m-XO and Rb pair, do you connect both J5 and J6 on each unit or just J5? Scott Scott Mace wrote: > Has anyone tried to discipline the RFTG-m-RB without the -XO unit from > a house PPS feed? > > I think pins 4 and 8 on J6 are the PPS input. > > Scott > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ------------------------------ Message: 5 Date: Thu, 17 Jul 2008 22:35:06 +0000 From: [EMAIL PROTECTED] Subject: Re: [time-nuts] Thunderbolt monitor To: Discussion of precise time and frequency measurement <[email protected]>, Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[EMAIL PROTECTED] omcast.net> Content-Type: text/plain I too have never seen one go dim. In fact, I have a VCR (Beta!) that's been pluged in continously since I got it new in the early '80s. It still looks the same as when I got it except that the display has had a left to right wave going through it since about 1995. So, wavy- but not dim at all. -Dave -------------- Original message -------------- From: Jeffrey Pawlan <[EMAIL PROTECTED]> > Regarding the VFD display, although they may be very different one > manufacturer to another, I can definitely dispute a prior statement > made that VFDs in general have a short lifetime and become dim. They > are universally used in VCRs, DVD players, microwave ovens, and some > clocks. I have never had one become dim or burn out. The displays in > my appliances are on even when the rest of the appliance is off. I > have never seen one become dim even after 15 years of on-time. > > I look forward to your project. > > > 73, > > Jeffrey Pawlan, WA6KBL > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 6 Date: Thu, 17 Jul 2008 22:35:06 +0000 From: [EMAIL PROTECTED] Subject: Re: [time-nuts] Thunderbolt monitor To: Discussion of precise time and frequency measurement <[email protected]>, Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[EMAIL PROTECTED] omcast.net> Content-Type: text/plain I too have never seen one go dim. In fact, I have a VCR (Beta!) that's been pluged in continously since I got it new in the early '80s. It still looks the same as when I got it except that the display has had a left to right wave going through it since about 1995. So, wavy- but not dim at all. -Dave -------------- Original message -------------- From: Jeffrey Pawlan <[EMAIL PROTECTED]> > Regarding the VFD display, although they may be very different one > manufacturer to another, I can definitely dispute a prior statement > made that VFDs in general have a short lifetime and become dim. They > are universally used in VCRs, DVD players, microwave ovens, and some > clocks. I have never had one become dim or burn out. The displays in > my appliances are on even when the rest of the appliance is off. I > have never seen one become dim even after 15 years of on-time. > > I look forward to your project. > > > 73, > > Jeffrey Pawlan, WA6KBL > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 7 Date: Fri, 18 Jul 2008 08:50:34 +1000 From: Neville Michie <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Thunderbolt monitor To: Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed From my thermionic valve days, the emmissivity of a filament was greatly extended by under-running them. If the display is pemanently run at a lower current in dim mode, how long could the life be extended by dropping the filament voltage by a small margin? cheers, Neville Michie On 18/07/2008, at 8:35 AM, [EMAIL PROTECTED] wrote: > I too have never seen one go dim. In fact, I have a VCR (Beta!) > that's been pluged in continously since I got it new in the early > '80s. It still looks the same as when I got it except that the > display has had a left to right wave going through it since about > 1995. So, wavy- but not dim at all. > > -Dave > > > -------------- Original message -------------- > From: Jeffrey Pawlan <[EMAIL PROTECTED]> > >> Regarding the VFD display, although they may be very different one >> manufacturer to another, I can definitely dispute a prior statement >> made that VFDs in general have a short lifetime and become dim. They >> are universally used in VCRs, DVD players, microwave ovens, and some >> clocks. I have never had one become dim or burn out. The displays in >> my appliances are on even when the rest of the appliance is off. I >> have never seen one become dim even after 15 years of on-time. >> >> I look forward to your project. >> >> >> 73, >> >> Jeffrey Pawlan, WA6KBL >> >> >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/ >> listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/ > time-nuts > and follow the instructions there. ------------------------------ Message: 8 Date: Thu, 17 Jul 2008 21:17:40 -0400 From: [EMAIL PROTECTED] Subject: [time-nuts] change in email address To: [email protected] Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="us-ascii" change in email address: ??? was: ????????????????????????????????????? is: ?? [EMAIL PROTECTED] [EMAIL PROTECTED] Thanks, Bill Hanna ------------------------------ Message: 9 Date: Fri, 18 Jul 2008 11:42:45 +0200 From: "Baragwanath, Chris (TSG)" <[EMAIL PROTECTED]> Subject: [time-nuts] TimeNuts Assistance Request To: <[email protected]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="US-ASCII" Hi all Time Nuts, I am a 'side line' member of the mailing list, ex Broadcast engineer whose principle fascination is accurate pendulum clocks and as one who has been lucky enough to have been in the presence of the ultimate "Clock" here in South Africa, the SAST (South African Standard Time) cluster. We do not have a "free to air" telephonic Time and Freq service in SA as the NIST does and our principle RF source (ZUO_ has long been discontinued for economic reasons (Other than the distant low power coastal stations the transmit a few mins a day for shipping purposes). The former Govt Labs and Standards Authorities are now privatised to lessen the burden on the fiscus and supposed to be self supporting, so charge and arm and a leg for access to their facilities, that our tax money paid for in the first place) At present, radio propagation conditions are so poor that and of the NIST and other stations are unusable as a tone reference or 1 pulse per second reference, and so have to call the NIST land line number, which is an expensive call from South Africa. As a voluntary / community service, we are trying to establish a freely accessible tone and pulse service and are looking for a donation of any unwanted equipment that will help us get a more stable 440hz and 1 PPS reference running. (The current oscillator is a good old uncompensated crystal British Ferrograph Test Set from broadcast days interrupted by another uncompensated xtal osc which interrupts the tone to prove the PPS output). Any donation of unwanted equipment, especially of more stable equipment or the ultimate, a GPS Rx board with 1 PPS output would be greatly appreciated. If anyone is prepared to help, I would be most grateful and would cover the shipping costs to SA. The mains in SA is 220v 50hz, but do have access to a 120v 60hz sinewave inverter unit to safely power US spec equipment. Many thanks in advance, Kind regards, Chris D Bagwanath "Its About Time" [EMAIL PROTECTED] Tel +27 83 700 5057 Fax: +27 11 792 166 ------------------------------ Message: 10 Date: Fri, 18 Jul 2008 07:14:18 -0500 From: "Didier Juges" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] TimeNuts Assistance Request To: "'Discussion of precise time and frequency measurement'" <[email protected]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="US-ASCII" Chris, What is the 440Hz used for, other than tune instruments? Didier > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Baragwanath, Chris > (TSG) > Sent: Friday, July 18, 2008 4:43 AM > To: [email protected] > Subject: [time-nuts] TimeNuts Assistance Request > > Hi all Time Nuts, > > I am a 'side line' member of the mailing list, ex Broadcast engineer > whose principle fascination is accurate pendulum clocks and as one who > has been lucky enough to have been in the presence of the ultimate > "Clock" here in South Africa, the SAST (South African Standard Time) > cluster. > > We do not have a "free to air" telephonic Time and Freq service in SA > as the NIST does and our principle RF source (ZUO_ has long been > discontinued for economic reasons (Other than the distant low power > coastal stations the transmit a few mins a day for shipping purposes). > The former Govt Labs and Standards Authorities are now privatised to > lessen the burden on the fiscus and supposed to be self supporting, so > charge and arm and a leg for access to their facilities, that our tax > money paid for in the first place) > > At present, radio propagation conditions are so poor that and of the > NIST and other stations are unusable as a tone reference or 1 pulse > per second reference, and so have to call the NIST land line number, > which is an expensive call from South Africa. > > As a voluntary / community service, we are trying to establish a > freely accessible tone and pulse service and are looking for a > donation of any unwanted equipment that will help us get a more stable > 440hz and 1 PPS reference running. > (The current oscillator is a good old uncompensated crystal British > Ferrograph Test Set from broadcast days interrupted by another > uncompensated xtal osc which interrupts the tone to prove the PPS > output). > > Any donation of unwanted equipment, especially of more stable > equipment or the ultimate, a GPS Rx board with 1 PPS output would be > greatly appreciated. > > If anyone is prepared to help, I would be most grateful and would > cover the shipping costs to SA. > > The mains in SA is 220v 50hz, but do have access to a 120v 60hz > sinewave inverter unit to safely power US spec equipment. > > Many thanks in advance, > > > Kind regards, > > > Chris D Bagwanath > "Its About Time" > > [EMAIL PROTECTED] > Tel +27 83 700 5057 > Fax: +27 11 792 166 > > > > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 48, Issue 47 ***************************************** _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
