Feel free to add information to the wiki or make edits as needed. Please respect the work of others by adding your own content rather than editing or removing someone else's content unless doing things like updating URL's etc.?
|
20 pf ceramic trimmer caps 40? each (qty 50) delivered from AliExpress
https://www.aliexpress.us/item/2251832645851677.html?ug_edm_item_id=2251832645851677&pdp_npi=4%40dis%21USD%21%2417.00%21%2417.00%21%21%21%21%21%402151e05a17444595335345189d181e%2165026062923%21edm%21%
By
Jim WB4ILP
·
#9310
·
|
|
Re: BPF for DC receiver video
Hi,
I have a number of Kits and Parts dual BPF boards which show extra suckout at the opposing band on the filter response, so it is possible that the toroids are coupling at a low level.? However I
By
zl1ujg
·
#9309
·
|
|
Re: Oak Hills Research
Chuck,
What parameters should I use for Oak Hills Research manuals, schematics, etc?
Thank you for doing this favor for us.
Dave K8WPE
By
David Wilcox K8WPE
·
#9308
·
|
|
Reprieve from tariff possible?
It appears that most of the chips, transistors, electronic parts are now exempt from the tariff.? Mostly I believe codes 8541 and 8542 affect
By
bruce williams
·
#9307
·
|
|
Re: Honbay trimmers; I took one for the team
Yes, probably newly manufactured. I did notice that Jameco says "more on
the way". I just wasn't sure if anyone is still making quality ceramic
variable caps of any size. So many things now are
By
Jim WB4ILP
·
#9306
·
|
|
Oak Hills Research
Gang,
Doug DeMaw, W1FB, started Oak Hills Research way back in time.
Dick Witzke, KE8KL-W7DKU-K7NL <sk>, bought the company and produced
???????????? a large number of kits that we all
By
chuck adams
·
#9305
·
|
|
Re: Oak Hills Research
I have the manual scanned in for the 20m version that I built
back in the day.? File size is 1.7MB.
--
chuck adams, aa7fo
QRP WAS 17m started Apr 2, 2025
WAS-17 QRP -->
By
chuck adams
·
#9304
·
|
|
Re: Honbay trimmers; I took one for the team
New or NOS? Cannot say. I'm inclined to the former because Jameco publishes their stock count and claims new shipments arriving periodically.
I have made purchases spanning a year or more and they're
By
k6whp
·
#9303
·
|
|
Oak Hills Research
Is there a specific groups.io site for Oak Hills Research transceivers?
A friend of mine has an OHR Spirit transceiver, and he is trying to find information about it, manual, and schematic.
Thank
By
David Wilcox K8WPE
·
#9302
·
|
|
Re: Honbay trimmers; I took one for the team
The Jameco trimmers are available on Amazon also. 98? and free shipping if
you have Amazon Prime.
BTW, are the Jameco trimmers newly manufactured or NOS?
Jim WB4ILP
[email protected]> wrote:
By
Jim WB4ILP
·
#9301
·
|
|
Re: Earliest example of Manhattan construction?
If you follow the foot notes
There is a series QST, April thru September 1974 with a voltmeter and cut pattern for "Learning to work with
By
Michael
·
#9300
·
|
|
Re: Honbay trimmers; I took one for the team
Oh look - a trimcap that actually looks like a trimcap - and not a bad price either! Like you (and probably most everyone else) I don't like those little brown things. I have a small stash of them
By
Dave AA7EE
·
#9299
·
|
|
Re: BPF for DC receiver video
Jim,
I know from something I read decades ago that turning two toroids 90deg
to each other greatly reduces any interaction.? Makes since from a E&M
standpoint.
I would think that you have to be
By
chuck adams
·
#9298
·
|
|
Re: BPF for DC receiver video
Hi Chuck,
In reading your response to my post, it dawned on me that a simple
experiment might shed some light on the self shielding or magnetic
field containment of toroids. Take a
By
Jim Kortge, K8IQY
·
#9297
·
|
|
Re: BPF for DC receiver video
Jim,
I do not consider it a dispute.? I was using an L/C meter to test for effects.
Since the L/C meter evaluates at a much lower frequency, there is room for
more experiments.? I would have to sit
By
chuck adams
·
#9296
·
|
|
Re: Honbay trimmers; I took one for the team
In keeping up with the mob, I had been buying my trimmers from JameCo. They are the ceramic ones and -- importantly -- a slot screwdriver fits and can turn the little buggers. (Done with the little
By
k6whp
·
#9295
·
|
|
Re: BPF for DC receiver video
All,
Not to get into a dispute with Chuck and others, but my experience
is that if you mount a toroid tight to the copper surface of PCB
material, it will indeed change the
By
Jim Kortge, K8IQY
·
#9294
·
|
|
Re: BPF for DC receiver video
That was instructive Chuck. I knew about the self-shielding properties of toroids, but didn't realize the fields around them are that tightly restricted. On the PCB's I've seen that have horizontally
By
Dave AA7EE
·
#9293
·
|
|
Re: When PCB's are too expensive, and you're out of copper boards.
Yes the tin sheets can be very dangerous! Even pulling the lid tab open can cut like a knife. I have used thick coppers tape as ground plane and to solder on strips. One side of the copper tape has a
By
Kees PE7ST
·
#9292
·
|
|
BPF for DC receiver video
For Dave, AA7EE, and anyone else interested. I added about 3 mins at the end of this
video showing that a toroid inductor in free space, vertically mounted on a PCB or
horizontally mounted on a PCB
By
chuck adams
·
#9291
·
|