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

2016-03-06 Thread johncroos via time-nuts
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; T-

Re: [time-nuts] Suggested Low Noise Transistors

2015-07-26 Thread johncroos via time-nuts
I offer the following for your consideration. Once upon a time - about 1968 Motorola introduced 4 low noise transistors for audio and low frequency applications. There were th 2N5086, 5087, 5088 and 5089. The 5086 and 5087 are PNP and the 5088 and 5089 are NPN. They are almost perfect complement

Re: [time-nuts] T.I. questions (Magnus Danielson)

2015-02-07 Thread johncroos via time-nuts
A further comment on design of pseudo random code generators. At some point the code may enter the dreaded all "zeros" state. This clocks a zero on the input stage through all stages and the whole thing just stops. So a AND gate looking at all stages in parallel is used to detect the all zero sta

[time-nuts] Hp Family GPS DOs vs. Tbolts Rev 3 SW and Trimble VCXO

2014-11-30 Thread johncroos via time-nuts
With all of the discussion of the recent availability of various HP family GPS DO devices, I was wondering if I should get a couple. Presently I have a couple of T-bolts that seem to serve me well. What wold be the advantages gained by going to the HPs. Need 10 MHz output though. Any thoughts? -7

[time-nuts] 5 to 10 MHz Quad Driven Mixer doubler article

2014-11-19 Thread johncroos via time-nuts
Apparently there is some interest in this technique. So far I have 35 requests and still counting. Please if you do want a copy send me an email OFF LIST to johncr...@aol.com. Requests posted on list are too hard to find and too hard to make into a master address list. In addition to the basic art

[time-nuts] 5 to 10 MHz Quadrature Driven Mixer Doubler

2014-11-19 Thread johncroos via time-nuts
I have received permission to distribute copies of my QEX article on this subject from ARRL. In addition to the article I will include full size schematics and color photos of the various assemblies. The design includes an adjustable 10 MHz output amplifier for driving 50 OHM loads. If interested