Re: "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B
Building phase shift networks or fabbing a board for some DDS chips in TQFP packages?
strikes me as the hard way to create a quadrature clock.
Could use a 7474 dual D-FlipFlop as done on the $21 Softrock Lite II:??
Requires a VFO (such as the $1 Si5351 plus a $1 microcontroller) operating at 4x the operating frequency,?
Or buy the RX-Ensemble kit for $64, general coverage and includes an si570 clock source.
Either one is emitting quadrature baseband audio, you could hook it up to your stereo amp
for Binaural audio, instead of using a computer soundcard and decoding stuff digitally.
.
Jerry, KE7ER
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On Thu, Nov 21, 2019 at 04:50 PM, Bob Clarke wrote:
One alternative to phasing networks in quadrature downconverters is to use two sources with a common reference, on the same frequency but 90 degrees out of phase.
You can do this with a dual DDS IC or two DDS ICs (or two fractional-N PLL/VCOs with the phase programming feature) with a bit of calibration. You can then, as Rick Campbell KK7B?
does in his QST article, drive a pair of audio phase shift networks to complete the image-reject downconverter.
?
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Re: Replacing SBL-1 with hand built mixer?
From looking around online, couldn't you use an NE602 in place of an SBL-1? They're definitely cheaper.
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Re: Replacing SBL-1 with hand built mixer?
Diz used to sell a DBM kit:??
I used a couple in project and they worked well.
Although he no longer sells this kit, his design might provide some food for thought.
cheers, Graham ve3gtc
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Re: Replacing SBL-1 with hand built mixer?
Thank you, gents! I appreciate the assistance and understanding. Given the low-buck nature of anything I do, I'm quite alright with a hand built mixer vs a pre-made mixer, even if it is smaller and higher performing :)? 73! --
Ryan Flowers W7RLF
https://miscdotgeek.com
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Switch-mode, consumer grade power "cubes" (AKA: Wall Warts) are a menace and, to a lesser degree, any consumer grade device containing a microprocessor.??
Most Internet modems, routers and other network peripherals are powered from 12 Volts D.C..? Here, I power my cable modem, wifi router and VOIP ATA from a 12 Volt backup 'box' made by Belkin.? 86'd the three wall warts that formerly powered the three.? Those 3 boxes are about 4-5 feet from my operating position and about 6 feet from the floor (to get the wifi router antennas as high as practical). Now, things are considerably less noisy, in fact, I hardly hear them if at all.? My direct ethernet cable connection from the router to the shack PC is CAT-5E cable and it's quiet without additional ferrites, so far.?
There is something else that clobbers me at this location but it's coming in from the outside world on the A.C. power line drop; likely from a neighbor.? I chased one noise source for nearly a day and found a defective charger for one of my DMR handhelds to be the culprit.? Sounded like a sawmill at full song.? It got the hammer.
I concur with filters on the network (and wall wart) cables but I'd first try ruling out the warts by powering the network equipment on batteries as a test.? ?
Best of luck finding your interference and
73.......Steve Smith WB6TNL
? ? ? ? ? ? ? ? "Snort Rosin"
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My thoughts are with the switching power supply. Test it with a test load, anything really.?
Hi Curt,
A 3 pound sledge hammer comes quickly to mind. But then you will be
without your WIFI :(
Lucky me - I don't hear my WIFI in my radios. The router is halfway to
the other end of the house. My radios are at either end of the house
(two locations). Others have tamed the router rfi the same way I have
tamed noises from some of my other computer gear. Try some ferrite
chokes on external leads from the router - especially the power supply.
Sometimes the beast is the power supply itself. Most are 5 volt DC power
supplies and they are switchers. Hams have replaced the switchers with
good linear regulated supplied. Those are much more civilized.
So try filtering at or near the WIFI unit. Try relocating the router
farther from your radios. And use coax with your antennas to at least
get outside the house (farther away from the router). I use end fed
wires that come right into the shack sometimes and they are much more
sensitive to such RFI sources.
Good luck with your evil router. Go tame that beast!
73,
Bill? KU8H
On 11/24/19 6:56 AM, Curt via Groups.Io wrote:
> Since this is a "tech" group, want to know if others have experienced
> and solved WIFI RFI.
>
> I own a Netgear 6300 "Smart" WIFI router that is located inside the
> shack on desk near the operating position.? I experience "motorboat"
> interference on HF, all bands.? I originally thought it was a problem in
> one of my older transceivers ( Triton IV ) with the audio amplifier and
> nearly dismantled the radio until heard it in another radio and traced
> it to the router.
>
> Thoughts?
>
--
bark less - wag more
-- Ryan Flowers W7RLF
https://miscdotgeek.com
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Re: "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B
Thanks Nick.? That¡¯s quite an ambitious project. Mike K5ESS ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Nick Kennedy
Sent: Sunday, November 24, 2019 8:13 AM
To: [email protected]
Subject: Re: [qrptech] "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B ? See AA0ZZ's article on the IQ Pro with the AD9854 in the May/June 2006 QST.?? ? On Sat, Nov 23, 2019 at 10:21 PM K5ESS via Groups.Io <k5ess.nothdurft=[email protected]> wrote: Has anyone used an AD9854 DDS to provide a quadrature LO? Mike K5ESS ?
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Hi Curt,
A 3 pound sledge hammer comes quickly to mind. But then you will be without your WIFI :(
Lucky me - I don't hear my WIFI in my radios. The router is halfway to the other end of the house. My radios are at either end of the house (two locations). Others have tamed the router rfi the same way I have tamed noises from some of my other computer gear. Try some ferrite chokes on external leads from the router - especially the power supply. Sometimes the beast is the power supply itself. Most are 5 volt DC power supplies and they are switchers. Hams have replaced the switchers with good linear regulated supplied. Those are much more civilized.
So try filtering at or near the WIFI unit. Try relocating the router farther from your radios. And use coax with your antennas to at least get outside the house (farther away from the router). I use end fed wires that come right into the shack sometimes and they are much more sensitive to such RFI sources.
Good luck with your evil router. Go tame that beast!
73,
Bill KU8H
toggle quoted message
Show quoted text
On 11/24/19 6:56 AM, Curt via Groups.Io wrote: Since this is a "tech" group, want to know if others have experienced and solved WIFI RFI.
I own a Netgear 6300 "Smart" WIFI router that is located inside the shack on desk near the operating position.? I experience "motorboat" interference on HF, all bands.? I originally thought it was a problem in one of my older transceivers ( Triton IV ) with the audio amplifier and nearly dismantled the radio until heard it in another radio and traced it to the router.
Thoughts?
--
bark less - wag more
|
Re: "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B
See AA0ZZ's article on the IQ Pro with the AD9854 in the May/June 2006 QST.??
?
73-
Nick, WA5BDU ?
On Sat, Nov 23, 2019 at 10:21 PM K5ESS via Groups.Io <k5ess.nothdurft= [email protected]> wrote: Has anyone used an AD9854 DDS to provide a quadrature LO? Mike K5ESS ?
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Re: Replacing SBL-1 with hand built mixer?
Ryan,
What you suggest is just what Farhan has done with his BITX and uBITX radios.
Ben, K0IKR
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Since this is a "tech" group, want to know if others have experienced and solved WIFI RFI.
I own a Netgear 6300 "Smart" WIFI router that is located inside the shack on desk near the operating position.? I experience "motorboat" interference on HF, all bands.? I originally thought it was a problem in one of my older transceivers ( Triton IV ) with the audio amplifier and nearly dismantled the radio until heard it in another radio and traced it to the router.
Thoughts?
|
Re: "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B
Has anyone used an AD9854 DDS to provide a quadrature LO? Mike K5ESS ?
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Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Bob Clarke
Sent: Thursday, November 21, 2019 6:44 PM
To: [email protected]
Subject: Re: [qrptech] "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B ? One alternative to phasing networks in quadrature downconverters is to use two sources with a common reference, on the same frequency but 90 degrees out of phase. You can do this with a dual DDS IC or two DDS ICs (or two fractional-N PLL/VCOs with the phase programming feature) with a bit of calibration. You can then, as Rick Campbell KK7B? does in his QST article, drive a pair of audio phase shift networks to complete the image-reject downconverter. ? Bob, N1RC ? ? On Thu, Nov 14, 2019 at 11:30 PM Ted KX4OM via Groups.Io <wirehead73=[email protected]> wrote: Jeff Damm, WA7MLH has a couple of diode ring boards shared on Osh Park. The ones here use Bat54S dual diodes. When you order a shared project, you get 3 boards for the listed price. I have ordered from them. Many of you know Jeff as a collaborator/contributor of stuff in EMRFD. He also has a version of the Hybrid Cascode IF Amplifier that he created, along with a general purpose "bench" HyCas design.
The other board, modular for a project, is on page 1
Ted, KX4OM
--
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Re: Replacing SBL-1 with hand built mixer?
What Kirk said.
I will add: size.? Unless you have teeny-tiny fingers :-P you won't be able to duplicate an SBL-1, HA!
However, for ham HF use and if assembled properly, a HB DBM will function just fine.? Proof:? Jim Kortge's
2N2/40 and 40+: <?
73.......Steve Smith WB6TNL
? ? ? ? ? ? ? ? "Snort Rosin"
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Re: Replacing SBL-1 with hand built mixer?
Hey, Ryan,
The schematic looks exactly like a double-balanced mixer because it is! :)?? Exactly.
And yes, you can build your own, but you may not experience the same level of performance with your home-brew DBMs. It's difficult to achieve identical windings when making these by hand, and the diodes MC uses are optimized for the purpose (ours' almost certainly aren't). Then there's the SBL-1's shielding, which is probably different from home-brew DBMs (many of which are completely unshielded).
In short, you can roll your own. I have done it several times, but I almost always use SBL-1s now (big cache on hand) or ADE-1s (lesser cache). My home-brew radios need all of the mixer performance they can muster, which leave a bit of headroom for me to mess things up elsewhere (typically impedance matching?).
Regards,
--Kirk, NT0Z ? Rochester, MN
My book, "Stealth Amateur Radio," is now available from
www.stealthamateur.com and on the Amazon Kindle (soon)
On Saturday, November 23, 2019, 5:38:48 PM CST, Ryan Flowers <geocrasher@...> wrote:
Hi everyone, I'm looking at many circuits and I see the ones that reference using the SBL-1 mixer. Is there any reason not to just build a double balanced diode ring mixer with discrete components instead? I'm referring to this mixer, which has a schematic that really seems to be the same as a double balanced diode ring mixer.? Thanks for any pointers :)? --
Ryan Flowers W7RLF
https://miscdotgeek.com
|
Replacing SBL-1 with hand built mixer?
Hi everyone, I'm looking at many circuits and I see the ones that reference using the SBL-1 mixer. Is there any reason not to just build a double balanced diode ring mixer with discrete components instead? I'm referring to this mixer, which has a schematic that really seems to be the same as a double balanced diode ring mixer.? Thanks for any pointers :)? --
Ryan Flowers W7RLF
https://miscdotgeek.com
|
My sincere pleasure. Thanks for joining :) --
Ryan Flowers W7RLF
https://miscdotgeek.com
|
Re: "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B
One alternative to phasing networks in quadrature downconverters is to use two sources with a common reference, on the same frequency but 90 degrees out of phase. You can do this with a dual DDS IC or two DDS ICs (or two fractional-N PLL/VCOs with the phase programming feature) with a bit of calibration. You can then, as Rick Campbell KK7B? does in his QST article, drive a pair of audio phase shift networks to complete the image-reject downconverter.
Bob, N1RC
On Thu, Nov 14, 2019 at 11:30 PM Ted KX4OM via Groups.Io <wirehead73= [email protected]> wrote: Jeff Damm, WA7MLH has a couple of diode ring boards shared on Osh Park. The ones here use Bat54S dual diodes. When you order a shared project, you get 3 boards for the listed price. I have ordered from them. Many of you know Jeff as a collaborator/contributor of stuff in EMRFD. He also has a version of the Hybrid Cascode IF Amplifier that he created, along with a general purpose "bench" HyCas design.
The other board, modular for a project, is on page 1
Ted, KX4OM
-- Bob Clarke
M: 978.337.2720
|
Re: NP0 Capacitors for QRP homebrew
I wouldn't trust the "Hilitich" kit, or whatever that is. I buy mostly monolythic ceramic caps, Class 1 NP0/C0G temp coefficient for VFO and filter use, and Class 2 X7R monolythics for bypass and general purpose. No Class 2 Z5U or Y5V caps in my homebrew stuff. See wikipedia.org/wiki/Ceramic_capacitor
For Colpitts VFOs and audio precision caps (like? some 2,000 pF polystyrenes in the frequency circuits of my build of the ARRL Two-Tone Generator for SSB testing), relatively high capacitance polystyrene caps are very good. They are very temperature-stable. I have a bunch of low value ones as well. For repair of tube stuff, ceramic disc NP0 or another appropriate temperature coefficient. Have to watch the voltage ratings on those.
I have a bunch of low and relatively high values of classic ceramic disk NP0s, 1 pF and above.
Ted, KX4OM
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Re: NP0 Capacitors for QRP homebrew
On Tue, Nov 19, 2019 at 10:42 PM, Steve Ratzlaff wrote:
is the first place I look for such caps
Another vote for DIZ.
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Re: NP0 Capacitors for QRP homebrew
It's likely that the low value capacitors (under 1nF) actually are NP0 capacitors, because most ceramic caps in those values are. But the kit doesn't specify it so I would be wary.
Hi Ryan,
That kit is OK for general caps however none of them are NP0
caps!
Steve AA7U
On 11/19/2019 7:46 PM, Ryan Flowers
wrote:
Hey everyone,
This winter I'd like to do some homebrewing and will need NP0
capacitors- I don't have any right now! What do you think of this
kit??
23 values, 30 each (60 for the 0.1pf/100nf) and it seems like a
reasonable selection. I have Amazon $$ to spend and so that's why
I'm focused on using them as a vendor. If anybody has other
suggestions, I'm all ears. Thanks :)?
--
Ryan Flowers W7RLF
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Nick Kennedy
Kirk Kleinschmidt, NT0Z
Bob N1RC
Shirley Dulcey KE1L