Hi
> On Dec 24, 2014, at 8:28 PM, Arthur Dent wrote:
>
> Those of you who know I had hacked the RFTG-u REF 1 GPS years
> ago and had one running for 4 years before other time nuts
> discovered these units probably won't be too surprised that
> I have tried another hack that may have limited int
Those of you who know I had hacked the RFTG-u REF 1 GPS years
ago and had one running for 4 years before other time nuts
discovered these units probably won't be too surprised that
I have tried another hack that may have limited interest but
works for me.
Having owned a large number of Thunderbolt
Hi
Very interesting !! Thanks for sharing.
As you can see from the Fluke schematics, the input amplifiers on counters can
get quite complex. I would definitely recommend playing a bit with the input
channels on your board. Here’s what I would do, there are many other approaches:
1) Set up a h
The CLK1 input circuit produces an output incompatiblr with the 3.3V CMOS deice
it drives.A pair of pnp transistors in an otherwise similar circuit is capable
of producing a 3.3V CMOS compatible output signal.
Using independent voltage dividers to bias the transistor bases is a bad idea
in that
Li
I had not been following the thread and for some reason followed your links.
Very nice to see your work.
Regards
Paul
WB8TSL
On Wed, Dec 24, 2014 at 11:19 AM, Li Ang wrote:
> http://www.qsl.net/bi7lnq/freqcnt_bi7lnq_v4.pdf this is my current board.
> I'm not a hardware guy, feel free to corr
I agree that in some ways it is not too swift, but it is
as I said, a direct DC path... not even a resistor, nor, as
far as I can tell, any diode clamp. The GPS RF path does
have a blocking capacitor, and all sorts of protection
diodes and bandpass filters. Because the antenna of the
40dB preamp
Nice work Chuck. So now you have a many port house reference that should
last for many years. My unit took a long time to start from cold, I think it
is operating in position mode and takes time to settle on the location.
Regards
- Original Message -
From: "Chuck Harris"
To: "Discus
http://www.qsl.net/bi7lnq/freqcnt_bi7lnq_v4.pdf this is my current board.
I'm not a hardware guy, feel free to correct my mistakes. :)
http://assets.fluke.com/manuals/6690smeng.pdf schematic of cnt90
aka pm6690
Happy holidays
Li Ang
___
tim
Hi
The ADC0808 is a (relatively) slow multi-input 8 bit ADC. It’s a good candidate
for built in test chores on a board that does not have a MCU with built in ADC
capability (or where you have used all the pins). They are cheap and easy to
use.
Current limiting the antenna supply is a pretty
An ADC0808 directly connected to the GPS antenna? Not even a DC
blocking capacitor? So it receives also the 5V antenna supply?
On Wed, Dec 24, 2014 at 7:42 AM, Chuck Harris wrote:
> It's Alive!!!
>
> The MGPS module was saying there was an A-to-D fault
> and a Feedline fault. Suspicious of the c
Adrian made me to try something which turned out to work.
It's just a bit tricky:
* 7 times arrow left gives 7 zeros (0.00)
* most left 0 changed to 1 (up arrow: 1.0)
* proceed to habe 1.053131
* change it to 0.05313 (down arrow at first 1 position
* press Enter
* Bingo!
GPS 10 M
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