On 27 Nov 2014 13:56, Jim Lux jim...@earthlink.net wrote:
Time to stock up on those transformers, mixers, amplifiersgrin
Throughout the month of December, all online orders of any quantity of
any Mini-Circuits catalog model from our web store on minicircuits.com will
receive a 10% *discount!
Am 05.12.2014 um 10:29 schrieb Dr. David Kirkby (Kirkby Microwave Ltd):
change rate of close to 1 USD = 1 GBP. I seem to be between a rock and
a hard place - either pay a ridiculous exchange rate, or pay a
ridiculous shipping handling cost.
Dave, G8WRB.
Try Digi-Key. Free shipping for
Hi
On Dec 5, 2014, at 4:29 AM, Dr. David Kirkby (Kirkby Microwave Ltd)
drkir...@kirkbymicrowave.co.uk wrote:
On 27 Nov 2014 13:56, Jim Lux jim...@earthlink.net wrote:
Time to stock up on those transformers, mixers, amplifiersgrin
Throughout the month of December, all online orders of
On 5 Dec 2014 12:23, Bob Camp kb...@n1k.org wrote:
Shipping across the atlantic has become silly expensive over the last
decade. There are a *lot* of organizations that are behind the curve on
figuring out how to do it cheaply.
Bob
I ship VNA calibration kits across the Atlantic almost every
On 12/5/14, 4:50 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 5 Dec 2014 12:23, Bob Camp kb...@n1k.org wrote:
Shipping across the atlantic has become silly expensive over the last
decade. There are a *lot* of organizations that are behind the curve on
figuring out how to do it
Bob Camp wrote:
Hi
On Nov 28, 2014, at 8:48 PM, Dave M dgmin...@mediacombb.net wrote:
Gerhard Hoffmann wrote:
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits technical
support folks in hopes of getting this, or similar, info about a
couple of
Hi
On Nov 29, 2014, at 5:26 AM, Dave M dgmin...@mediacombb.net wrote:
Bob Camp wrote:
Hi
On Nov 28, 2014, at 8:48 PM, Dave M dgmin...@mediacombb.net wrote:
Gerhard Hoffmann wrote:
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits
you can try the following vendor (RF Elettronica):
http://www.rf-microwave.com/en/shop.html
They ship abroad and prices are rather good.
_ Elio.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Rick,
Thanks for the brief review of MiniCircuits stuff (I'm not connected with
them in any way except as a customer).
Since you've characterized some of their parts, perhaps you could help
answer a question that someone else posted, and one that I would like to
have answered as well.
Have you
On 11/28/2014 10:08 AM, Dave M wrote:
Rick,
Thanks for the brief review of MiniCircuits stuff (I'm not connected
with them in any way except as a customer).
Since you've characterized some of their parts, perhaps you could help
answer a question that someone else posted, and one that I would
Hi
On Nov 28, 2014, at 2:27 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
On 11/28/2014 10:08 AM, Dave M wrote:
Rick,
Thanks for the brief review of MiniCircuits stuff (I'm not connected
with them in any way except as a customer).
Since you've characterized some of their
On 11/28/2014 1:04 PM, Bob Camp wrote:
If you do need to run substantial current through a choke core, the larger
binocular cores with a half turn through them are a better choice.
Still useless for 20A (or even 2A) though …
Bob
The binocular cores come in several hole sizes.
All other
The very tiny cores on MiniCircuits transformers will start to
saturate at hundreds of mA. The effect is that the magnetizing inductance
drops, which matters more at low frequencies than high frequencies. I try
to avoid feeding DC to an amplifier through a transformer winding.
Instead I use a
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits technical
support folks in hopes of getting this, or similar, info about a
couple of their transformer models (specifically, T1-1 and T4-1-KK81),
but so far, I'm still waiting. Guess I should give
Gerhard Hoffmann wrote:
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits technical
support folks in hopes of getting this, or similar, info about a
couple of their transformer models (specifically, T1-1 and
T4-1-KK81), but so far, I'm still
Hi
On Nov 28, 2014, at 8:48 PM, Dave M dgmin...@mediacombb.net wrote:
Gerhard Hoffmann wrote:
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits technical
support folks in hopes of getting this, or similar, info about a
couple of their
Hi
What time (note the tie in to be on topic for the list :) will their retail
location open on Thanksgiving?
Spending quality time on the auction sites can yield some pretty substantial
discounts on RF transformers. The search process is not simple due to the crazy
range of part numbers.
For a hobbyist doing things a few at a time, what advantage is there to
buying RF transformers made by Mini-circuits etc., vs winding them using
commonly available ferrite cores/binocular cores?
If I needed to do a production run of 1000+ boards with tiny SMT
transformers, sure, no problem buying
Hi
I believe I made that point earlier. The main complaint is the difficulty of
getting the correct cores. I seem to have a few dozen bags of cores. I still go
shopping for more as projects come up
Bob
Sent from my iPhone
On Nov 27, 2014, at 9:07 AM, Tim Shoppa tsho...@gmail.com wrote:
On 11/27/14, 7:07 AM, Tim Shoppa wrote:
For a hobbyist doing things a few at a time, what advantage is there to
buying RF transformers made by Mini-circuits etc., vs winding them using
commonly available ferrite cores/binocular cores?
Probably depends on the frequency ranges and such. The
On Thu, Nov 27, 2014 at 10:28 AM, Bob Camp kb...@n1k.org wrote:
The main complaint is the difficulty of getting the correct cores. I seem
to have a few dozen bags of cores.
The mainline distributors (Allied, Newark, Mouser, etc.) have excellent
selection of Fair-Rite and other cores.
Hi
At least last time I looked, the “easy to find” distributors had great
selections of parts used for switching power supplies and EMI suppression. When
you started to dig for the specialized parts for RF transformers and tuned
filters, the stock was pretty thin to nonexistent. If you move
Again I refer you to Clifton Labs website and cross-references there to the
Fair-Rite part numbers/mixes. Although the marketing largely emphasizes EMI
suppression, all the mainline distributors now offer several mixes and core
styles that are perfect for RF transformers.
Powdered iron, yeah,
On 11/27/2014 7:07 AM, Tim Shoppa wrote:
For a hobbyist doing things a few at a time, what advantage is there to
buying RF transformers made by Mini-circuits etc., vs winding them using
commonly available ferrite cores/binocular cores?
If I needed to do a production run of 1000+ boards with
On 11/27/2014 9:09 AM, Tim Shoppa wrote:
On Thu, Nov 27, 2014 at 10:28 AM, Bob Camp kb...@n1k.org wrote:
The main complaint is the difficulty of getting the correct cores. I seem
to have a few dozen bags of cores.
The mainline distributors (Allied, Newark, Mouser, etc.) have excellent
Another reason is reproducibility. If you or someone else wants to reproduce
your design, using a well defined and available commercial part makes it much
easier to achieve the same performance, particularly for RF components.
Didier KO4BB
On November 27, 2014 12:41:34 PM CST, Richard (Rick)
YES!
That's exactly why I go to Mini-Circuits.
Jim
On 11/27/2014 2:03 PM, Didier Juges wrote:
Another reason is reproducibility. If you or someone else wants to reproduce
your design, using a well defined and available commercial part makes it much
easier to achieve the same performance,
On 11/27/2014 11:03 AM, Didier Juges wrote:
Another reason is reproducibility. If you or someone else wants
to reproduce your design, using a well defined and available
commercial part makes it much easier to achieve the same
performance, particularly for RF components.
Didier KO4BB
Mouser carries a selection from Fair-Rite. They don't make it easy to
find a specific part number, however.
http://www.mouser.com/Fair-Rite/Passive-Components/EMI-RFI-Components/EMI-RFI-Suppressors-Ferrites/Ferrite-Toroids-Ferrite-Rings/_/N-bw7t9?P=1z13m3cZ1yxh9di
Joe Gray
W5JG
On Thu, Nov 27,
Hi
Finding the RF transformer parts is still a bit of a challenge.
Bob
On Nov 27, 2014, at 4:21 PM, Joseph Gray jg...@zianet.com wrote:
Mouser carries a selection from Fair-Rite. They don't make it easy to
find a specific part number, however.
Am 27.11.2014 um 23:30 schrieb Bob Camp:
Hi
Finding the RF transformer parts is still a bit of a challenge.
No. These work quite good for me:
CX2074 4:1 CT
CX2147 1:1 CT
http://www.digikey.de/product-search/de/rf-if-and-rfid/balun/3539019?k=cx2074
The 1:1 is optimum for the NIST
Hi
On Nov 27, 2014, at 5:10 PM, Gerhard Hoffmann dk...@arcor.de wrote:
Am 27.11.2014 um 23:30 schrieb Bob Camp:
Hi
Finding the RF transformer parts is still a bit of a challenge.
No. These work quite good for me:
CX2074 4:1 CT
CX2147 1:1 CT
To get back to the original post:
On 11/27/14, 3:10 PM, Gerhard Hoffmann wrote:
Am 27.11.2014 um 23:30 schrieb Bob Camp:
Hi
Finding the RF transformer parts is still a bit of a challenge.
No. These work quite good for me:
CX2074 4:1 CT
CX2147 1:1 CT
43 binocular core: 2843002402, 14 cents qty 1 at Mouser.
77 binocular core: 2873000202, 59 cents qty 1 at Newark.
43 material toroid: 5943000201, 12 cents qty 1 at Mouser.
Clifton Labs has good examples and measurements on transformers wound on
these and other cores.
On Thu, Nov 27, 2014 at
Hi
On Nov 27, 2014, at 5:59 PM, Jim Lux jim...@earthlink.net wrote:
On 11/27/14, 3:10 PM, Gerhard Hoffmann wrote:
Am 27.11.2014 um 23:30 schrieb Bob Camp:
Hi
Finding the RF transformer parts is still a bit of a challenge.
No. These work quite good for me:
CX2074 4:1 CT
CX2147
Here are a couple of links to some Fair-Rite documentation that can help you
determine which cores will work for broadband transformers
Use of Ferrites in Broadband Transformers
http://www.fair-rite.com/newfair/pdf/Broadband.pdf
And the current Fair-Rite product catalog
Hi
Those are the sort of parts I was looking for. There are about 10 of them
listed at Mouser, all with rational prices. That’s a reasonable selection for
starters. It’s still (unfortunately) a small selection compared to the full
range of product.
Bob
On Nov 27, 2014, at 6:17 PM, Tim
Hi
I’ve been using their products (and their competitors) to make transformers for
at least 40 years. It’s amazingly easy to do. The problem has always been
finding the raw cores without buying a ton of them at a time.
Bob
On Nov 27, 2014, at 6:34 PM, Dave M dgmin...@mediacombb.net wrote:
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