Well, I have an old EP-1140 EPROM programmer that may be able to but I do
not have the manual or the software for it.
Software was running under MS-DOS, maybe an early Windows version like 3.0
or 3.1 so it may well be old enough to support those chips.
I do have a modern TL866 II Plus but it does
Hi
A, but did you then whip up a batch of ammonium bifluoride to clean them
up after
playing with the grinding compound? :) They figured that part out part way
through WWII.
The lack proper post grind etch just about had all the radios out there out of
service.
Bob
> On Feb 27, 2020,
Been there; done that!
Rick N6RK
On 2/27/2020 12:15 PM, David Van Horn via time-nuts wrote:
I remember opening up those military crystals and sanding them down with Ajax
cleaner to raise the frequency or rubbing a little solder on the plate to lower
it for CW transmitters.
High school days.
Please contact me direct off list
In a message dated 2/27/2020 4:46:32 PM Eastern Standard Time,
time-n...@welwarsky.de writes:
On Donnerstag, 27. Februar 2020 19:16:22 CET ew via time-nuts wrote:
> Matthias where are you located. I am in the US but I have some partners in
> crime that may be
On Donnerstag, 27. Februar 2020 19:16:22 CET ew via time-nuts wrote:
> Matthias where are you located. I am in the US but I have some partners in
> crime that may be able to help you with AV testingewkeh...@aol.com
>
> Bert Kehren
I'm in Germany.
BR,
Matthias
>
Hi
The crystal industry in the US went from a couple of outfits (mostly in PA)
making <
a hundred a month in the 1930’s, to a massive bunch of outfits during WWII.
Most
were turning out a couple hundred an hour.
Much of that collapsed when the war ended and the demand went away. A few
I remember opening up those military crystals and sanding them down with Ajax
cleaner to raise the frequency or rubbing a little solder on the plate to lower
it for CW transmitters.
High school days.
--
David VanHorn
Lead Hardware Engineer
Backcountry Access, Inc.
2820 Wilderness Pl, Unit H
I seem to recall that crystals for frequency control (on a commercial
basis) were sort of a post WW2 thing (partly because of developments in
piezo hydrophones for sonar)
Crystals for radios were well established pre-WWII. There was an
FCS paper ~30 years ago about the WWII quartz
On 2/27/20 8:45 AM, Richard (Rick) Karlquist wrote:
OTOH, you could build a simple Colpitts
oscillator and see where it oscillates.
That's what they did back in the dark
ages.
Any time nut should be up for that.
Rick N6RK
But does a deForest Audion (ref Colpitts patent 1624537 1918) have
Matthias where are you located. I am in the US but I have some partners in
crime that may be able to help you with AV testing ewkeh...@aol.com
Bert Kehren
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Am 27.02.20 um 17:45 schrieb Richard (Rick) Karlquist:
OTOH, you could build a simple Colpitts
oscillator and see where it oscillates.
That's what they did back in the dark
ages.
Any time nut should be up for that.
5.000 MHz. That was easy. It used to be in something Colpitts-like
for 30
On Donnerstag, 27. Februar 2020 16:17:56 CET Tobias Pluess wrote:
> I will see how well it works. At least I got my PCBs this week, and my
> Mouser order for some components is on the way. I will start with the
> software for the STM32 soon, maybe I will then bother the mailing list
> again a bit
On 2/27/20 10:45, Richard (Rick) Karlquist wrote:
> OTOH, you could build a simple Colpitts
> oscillator and see where it oscillates.
> That's what they did back in the dark
> ages.
>
> Any time nut should be up for that.
I was going to suggest pumping it with white noise and then doing a long
FFT
OTOH, you could build a simple Colpitts
oscillator and see where it oscillates.
That's what they did back in the dark
ages.
Any time nut should be up for that.
Rick N6RK
On 2/27/2020 5:35 AM, Bob kb8tq wrote:
Hi
Ok, so just to run the math:
5 MHz / 2.9 = 1.724 MHz
If the Q at the
If you start off viewing the crystal in series (S21) I believe that you'll
be able to see
some response far enough away from the resonance to make it easier to find.
Dana
On Thu, Feb 27, 2020 at 9:39 AM Magnus Danielson wrote:
> Hi,
>
> Even if my VNA steps in 1 Hz if I ask it kindly, it can
Hi,
Even if my VNA steps in 1 Hz if I ask it kindly, it can be a bit
teadious work to find it.
Cheers,
Magnus
On 2020-02-27 14:35, Bob kb8tq wrote:
> Hi
>
> Ok, so just to run the math:
>
> 5 MHz / 2.9 = 1.724 MHz
>
> If the Q at the fundamental is 500K (a wild guess) then 1.724 MHz / 500,000 =
Hi Matthias,
jup, I agree but this "problem" will be easily fixed using the internal
pullup resistors of the STM32.
Best
Tobias
HB9FSX
On Thu, Feb 27, 2020 at 2:43 PM Matthias Welwarsky
wrote:
> On Mittwoch, 19. Februar 2020 14:50:57 CET wrote:
> > Hoi Tobias,
> >
> > Sorry for the late
On Mittwoch, 19. Februar 2020 14:50:57 CET wrote:
> Hoi Tobias,
>
> Sorry for the late answer. Took me some time to look at your
> schematics.
>
And I just had a quick look, too: I think you're missing a pull-up resistor
for the TDC7200 INTB signal. Not a huge problem, the built-in pull-up of
Hi
Ok, so just to run the math:
5 MHz / 2.9 = 1.724 MHz
If the Q at the fundamental is 500K (a wild guess) then 1.724 MHz / 500,000 =
3.4 Hz
In a world where a synthesized sweeper *might* be stepping in 10Hz steps,
that’s an
easy one to miss.
Bob
> On Feb 26, 2020, at 11:40 PM, Bernd
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