Hi, gang,
What's the best way folks have found to remove the Ebay special 5680's
from the hunk of PC board they're rivited to on arrival?
On a related note: Any speculation on whether an SMA connector could be
added to accommodate the 10MHz output? I seem to recall the 5680's
In a message dated 14/12/2011 21:41:13 GMT Standard Time,
kyr...@bluefeathertech.com writes:
What's the best way folks have found to remove the Ebay special 5680's
from the hunk of PC board they're rivited to on arrival?
Alan/Hex key, what look like rivets are screws :-)
These are small self-tapping hollow Allen screws. Find the right size
Allen L-shaped wrench and have at it...
Don
Bruce Lane
Hi, gang,
What's the best way folks have found to remove the Ebay special 5680's
from the hunk of PC board they're rivited to on arrival?
On a related
I just checked: it's a 1/16 in. hex wrench ( not metric.) They've been
driven in hard, don't give up...
Don
gandal...@aol.com
In a message dated 14/12/2011 21:41:13 GMT Standard Time,
kyr...@bluefeathertech.com writes:
What's the best way folks have found to remove the Ebay special 5680's
I didn't feel like digging for an allen key so I just drilled from the back
side of the board. I didn't go all the way through. It was just enough to
remove the nut or anchor that was attached to the PCB. It took about 1
minute.
-Bob
On Wed, Dec 14, 2011 at 2:48 PM, Don Latham
Lux, Jim (337C) wrote:
microwave frequency down to where it can be compared with the reference. You
can do a straight divider, but then, the number of divide ratios is limited,
because fast dividers tend to be powers of two, or, at best, small integers.
Generally true, but Centellax has a
Hi Hal,
I guess you are right. A DDS where I place a sine table spanning
2^20=1048576 locations will allow me to generate fout=fin*(step/2^20) but if
I choose to use only 100 locations I can generate 1 kHz from 10 MHz
exactly. Therefore this system would not need feedback. I have not looked
On 8/16/09 2:52 AM, Javier Serrano javier.serrano.par...@gmail.com
wrote:
Hi Hal,
I guess you are right. A DDS where I place a sine table spanning
2^20=1048576 locations will allow me to generate fout=fin*(step/2^20) but if
I choose to use only 100 locations I can generate 1 kHz from
On 8/16/09 10:19 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote:
Rich's proposal is very sound and similar to what I would consider. I
just haven't toyed with DROs but should get my wet feet some day... also
true for chip oscillators in that range.
There's a company up near Lake
Lux, Jim (337C) wrote:
The usual DDS chips (e.g. From Analog Devices) have a built in table of
fixed length. If you want to use something other than the power of 2 it
comes with, you'll need to implement the NCO in an FPGA, with an external
DAC.
Analog Devices is working on a variable
That would be very nifty. They have a DDS (or at least a patent on one)
that uses CORDIC to generate the samples, rather than a table of sin/cos, so
that might be a good start. I suppose it's a matter of trading silicon for
the lookup table for silicon for the complex multiplier. And, I would
But I'm missing a couple of key ideas.
How does one build a PLL at 3 GHz or 9 GHz?
I designed a board awhile back to try out some of the off-the-shelf PLL
chips from the same manufacturer: http://www.ke5fx.com/hpll.htm . It's not
in the league that's being discussed here (although the JPL
On 8/16/09 1:26 PM, John Miles jmi...@pop.net wrote:
But I'm missing a couple of key ideas.
How does one build a PLL at 3 GHz or 9 GHz?
I designed a board awhile back to try out some of the off-the-shelf PLL
chips from the same manufacturer: http://www.ke5fx.com/hpll.htm . It's
and that brings him to about 55 MHz. To generate that 55 MHz he has
several options: - Cascading two DDS chips to get many bits of
frequency resolution and leave the thing in open loop. I don't like
the absence of feedback in this option,
Why do you want feedback for a DDS?
It's not a PLL
Dear nuts,
A colleague from a Free Electron Laser lab has the following problem:
he needs to make a frequency to use as an X-band LO that is
*exactly*8994.03 MHz (3*2998.01 MHz) and it
*must* be locked to his S-band LO which is exactly 2998.01*732/757 MHz
(2899.00042272.MHz). He intends to
so there is one frequency that is X*(732/757), and he want to get X*3
from this? Seems like an integer-N PLL could do this pretty
straightforwardly, although I'd have to spend some time to figure out
the exact multiples. National Semiconductor has an app note on
frequency planning for synthsizers
David Bengtson wrote:
so there is one frequency that is X*(732/757), and he want to get X*3
from this? Seems like an integer-N PLL could do this pretty
straightforwardly, although I'd have to spend some time to figure out
the exact multiples. National Semiconductor has an app note on
Corrected version:
Yes. The ideal architecture would be to use a dielectric resonator
oscillator at 8994 MHz as the output source. Then divide its output by
two. Take that ~4.5 GHz signal and divide it by 757 using the divide by N
section of an Analog Devices ADF4106. Divide the 2899 MHz by
These days, you might want to consider using the GaAs VCOs from Hittite,
rather than the DRO. DROs are SUCH a pain to build and tune, being a
mechanical resonator in a cavity. Everything you do seems to adversely
affect the DRO. The MMIC VCO is just a die (or a die in a package) and it's
pretty
Lux, Jim (337C) wrote:
These days, you might want to consider using the GaAs VCOs from Hittite,
rather than the DRO. DROs are SUCH a pain to build and tune, being a
mechanical resonator in a cavity. Everything you do seems to adversely
affect the DRO. The MMIC VCO is just a die (or a die in
On 8/14/09 7:17 PM, Rick Karlquist rich...@karlquist.com wrote:
Lux, Jim (337C) wrote:
These days, you might want to consider using the GaAs VCOs from Hittite,
rather than the DRO. DROs are SUCH a pain to build and tune, being a
mechanical resonator in a cavity. Everything you do seems to
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