Off topic, but I heard tonight that WWV is going off the air at the end of
this month.
On Sunday, October 14, 2018, 9:24:51 PM PDT, Tom Van Baak
wrote:
> This is just a free running PRS10 wired to a TAPR TICC, I thought that I
> would
> run some stand alone tests before I brought my
> This is just a free running PRS10 wired to a TAPR TICC, I thought that I would
> run some stand alone tests before I brought my GPSDO in line too.
Ok, good idea to do a stand alone test. The plateau, though, is interesting and
I wouldn't quite have expected that in a 1PPS vs 10 MHz self-test. L
Tom,
This is just a free running PRS10 wired to a TAPR TICC, I thought that
I would run some stand alone tests before I brought my GPSDO in line
too. The PRS10 is the source for the 10MHz as well as reading the 1PPS
output from it.
Chris
-From: "Tom
On Sun, October 14, 2018 9:07 pm, Chris Burford wrote:
> I've collected several data sets over the last few days from my RFS
> and I'm puzzled by what I'm seeing.
Frequency stability measurements must always compare one device against
another.
I do not recall that you mentioned what is providing t
Chris,
Thanks for sharing the plot.
What instrument are you using to make the measurements? And what frequency
reference is being used? Is this a free-running PRS10, or is it locked to GPSDO
with some time constant?
Is that same GPSDO being used as a reference for your measurements? The platea
Hello All,
I've collected several data sets over the last few days from my RFS
and I'm puzzled by what I'm seeing. A link to the plot is here:
https://drive.google.com/open?id=10Kk8Cqx7es0SXf2H5AldiQkBo8nIfNMT
I'm looking at the averaging periods from about 100 thru 400 tau and
noticed a "plateau"
Your setup looks good to me.
One thing to consider. Most of the white plastic plumbing parts are not UV
resistant. A layer of paint should protect it. Or you can just wait, see
what happens, and fix it if/when it breaks.
Another approach if you want to avoid holes in the roof is to attach
Thanks for the (important) suggestion. I will make another trip to the hardware
store for some rubber sheeting or similar.
Matthew
> On Oct 14, 2018, at 4:57 PM, jimlux wrote:
>
>> On 10/14/18 4:42 PM, Tom Miller wrote:
>> - Original Message - From: "jimlux"
>> To:
>> Sent: Sunday, O
On 10/14/18 4:42 PM, Tom Miller wrote:
- Original Message - From: "jimlux"
To:
Sent: Sunday, October 14, 2018 7:07 PM
Subject: Re: [time-nuts] Troubleshooting an HP 58503A
On 10/14/18 3:03 PM, Matthew D'Asaro wrote:
All -
Thanks again for all the suggestions and advice I have gott
- Original Message -
From: "jimlux"
To:
Sent: Sunday, October 14, 2018 7:07 PM
Subject: Re: [time-nuts] Troubleshooting an HP 58503A
On 10/14/18 3:03 PM, Matthew D'Asaro wrote:
All -
Thanks again for all the suggestions and advice I have gotten on this
project. It ran all night
On 10/14/18 3:03 PM, Matthew D'Asaro wrote:
All -
Thanks again for all the suggestions and advice I have gotten on
this project. It ran all night without loosing lock, so I am calling it
fixed. There is just one more order of business before I can use it, and
that is some way of "mounting
Am 14.10.2018 um 22:14 schrieb Richard (Rick) Karlquist:
On 10/14/2018 11:20 AM, Dr. Ulrich L. Rohde via time-nuts wrote:
Actually the BFT is out of production since quite a while there are
more stable and higher Ft devices on the market.
73 de N1UL
How is a higher Ft device more stable?
Well said
Sent from my iPhone
> On Oct 14, 2018, at 4:14 PM, Gerhard Hoffmann wrote:
>
>
>
>> Am 14.10.2018 um 18:47 schrieb Dana Whitlow:
>> Corby,
>>
>> Now that I learn that the BFT66 is a "wild one", I'd remark that stability
>> is
>> indeed the likely issue. I was puzzled by the prese
Well some of the 7 GHz and higher Ft transistors have internal matching
networks to prevent such oscillations, but yes it is an important issue.
73 de N1UL
Sent from my iPhone
> On Oct 14, 2018, at 4:14 PM, Richard (Rick) Karlquist
> wrote:
>
>
>
>> On 10/14/2018 11:20 AM, Dr. Ulrich L. R
Sometimes a 10 Ohm resistor from Base to RF ground will rescue you.
73 de N1UL
Sent from my iPhone
> On Oct 14, 2018, at 4:31 PM, Bob kb8tq wrote:
>
> Hi
>
> What you have there is known as a cascade buffer amplifier. The common base
> stage combined with the common emitter has some well kno
Hi
What you have there is known as a cascade buffer amplifier. The common base
stage combined with the common emitter has some well known issues at high
frequencies ( like UHF / microwave). That’s the tradeoff for having really good
isolation at HF and usually at VHF.
Put a sniffer loop near t
Am 14.10.2018 um 18:47 schrieb Dana Whitlow:
Corby,
Now that I learn that the BFT66 is a "wild one", I'd remark that stability
is
indeed the likely issue. I was puzzled by the presence of that capacitor in
the first place, as this circuit is clearly neither tuned nor of especially
high freque
On 10/14/2018 11:20 AM, Dr. Ulrich L. Rohde via time-nuts wrote:
Actually the BFT is out of production since quite a while there are more stable
and higher Ft devices on the market.
73 de N1UL
How is a higher Ft device more stable? Those attributes
would seem to be mutually exclusive.
F
Actually the BFT is out of production since quite a while there are more stable
and higher Ft devices on the market.
73 de N1UL
Sent from my iPhone
> On Oct 14, 2018, at 12:47 PM, Dana Whitlow wrote:
>
> Corby,
>
> Now that I learn that the BFT66 is a "wild one", I'd remark that stability
Corby,
Now that I learn that the BFT66 is a "wild one", I'd remark that stability
is
indeed the likely issue. I was puzzled by the presence of that capacitor in
the first place, as this circuit is clearly neither tuned nor of especially
high
frequency capability.
Could you tell us more: what ki
The BFT66 if that is the type ( a bit difficult to read ) is a really "wild
one" on VHF. I have used it and unless surrounded by proper decoupling networks
in a well designed circuit it can and will oscillate.
I would have used a spectrum analyzer to check for any unwantedoscillations
well abo
Corby -
>From the schematic it does not look like anything special but only a 50 ohm
in and out circuit with fairly high isolation due to the common base of the
second BFT66. You may be able to simply use a newer MMIC from one of the
many sources to replace the assembly if you know the gain. Ge
Corby,
What frequency(s) is this amplifier passing? And sinusoidal, squarewave,
or other?
Dana
On Sun, Oct 14, 2018 at 10:57 AM wrote:
> Hi,
>
> I removed this amp from the EFOS2 Maser as it was intermittent.
>
> Of course now I can't get it to fail on the bench!
>
> I have fabricated a new
Hi,
I removed this amp from the EFOS2 Maser as it was intermittent.
Of course now I can't get it to fail on the bench!
I have fabricated a new PC board to replace it and have the components on
hand.
Note the 12pfd cap on the collector .
Some notes I have indicate is select at test and that is
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