?
Timothy E. Fidler : Engineer BE Mech Auckland?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
Damn -? ?schematic sent with last post was? for a whole different mixer and was an Arrl HB design
My magnum OPUS ex my head and LTSpice simulation is attached.? Treat it as weakware until I have my SBL- 1 on the bench and? have all the? physical ccts laid out on?
PCB (as in? isolated pad design on a bit of FR-4? 35 um material or similar).
NB There is cct discussion in the last post. BTW the? input? H- z buffer is the Hycas deign? first used? I think by Wes Hayward? ?now a Silent K.
Don't? subs for? the? J310 unless you have a FET? that has Idss of? 42 mA or better and? the same characteristics.? Leaded solderable? J310s are still about in? Isamabad Bazaars and similar places- you? need to look. I did and? I found.??
----- Original Message -----
To:
<[email protected]>
Cc:
Sent:
Tue, 4 Jun 2024 20:22:35 -0400 (EDT)
Subject:
Re: [CRKits] ADX-S V2!
Tim,
Where can we find information on the DDS6E VFO ?
Mike N2MS
> On 06/04/2024 9:53 AM EDT Timothy Fidler <engstr@...> wrote:
>
>
>
> ==========================================================
> BTW I have a DDS6E VFO from PRC it does work but the documentation is a nightmare. There seem tobe about 50k of them around onthe CHinese ebay sites still I'm going to do some work with it and and ADE-1 when it arrives - have been given one from Auckand well SBL -1 . I do have a couple of ADE-11s but I'd prefer the known device first . I have done modelling of it and the preamp in LTspice. I used a source follower J310 , the best RF FEtever made and that drove an HW 16 at bias point 80mA and a 4 to one Z match bifilar to drive the modelled ADE-1 the big issue is what is the Leff of the LO coil of the ADE-1 . it's easier to run a practical test but doing the sim with L =500n shows that the DBM will generate DSB. , more or less.
>
> The set up of the DDS6E requires a 3x 4 matrix key pad to set the IF and to be able to enter the -sign in specific items in the CAL routine. the hash key is used to enter the negative sign. the Matrix is wired in Row 1 , 2, 3, 4, Col 1, 2, 3 on the central white molex header L to Right . I worked this out partly from the original Indian documentation. It started out as a newDelhi ham project (like an MEng thesis project I think) and Firmeware (O source) was stolen and commercialised in PRC. The DDS cannot inject a Minicircuits 7dBm 50 Z mixer directly there's not enough mojo in the Oput circuit.
>
> DBM mixer comments - (relating to VFOs)?
> The ADE-1-24 which is very cheap on ebay (likely less than one USD in Yuan equivalent ) is a direct copy of the ADe-1 and simply has the pin functions of 5 and six reversed over the ADE- 1. That may be useful to you for any experiments you might want to do. This is is based on tests and discussion on Groups IO. I did not do any of the tests.
>
>
>
>
> Timothy E. Fidler : Engineer BE Mech Auckland?
> Telephone Whangarei 022 691 8405
> e: Engstr@...
>
>
>
> >
> > ----- Original Message -----
> >
> > From:
> > crkits@groupsio
> >
> >
> > To:
> > <[email protected]>
> >
> > Cc:
> >
> >
> > Sent:
> > Tue, 4 Jun 2024 21:18:00 +0800
> >
> > Subject:
> > Re: [CRKits] ADX-S V2!
> >
> >
> >
> > Tim,
> > Your reply served my all day laughter. Just one explanation:
> > Neon - Nihonjin - Japanese
> > Thanks,
> > Adam
> > ÔÚ 2024/6/4 21:02, Timothy Fidler via groupsio дµÀ:
> > > I used the Simple CHinese to Eng converter on the spiel from Adams HRO friend in the Browser and came up with these interesting facts in best Shakespearean prose (just as King Charles would write ....)
> > >
> > >
> > > Around nine o'clock, we sent the mother and daughter off. We drove around the park twice and found a temporary parking spot on the roadside. We headed straight to the location of the Rongda field battle. On the way, we also asked Xu Yi to come out.
> > >
> > > Where was Xu Yi ? - living in a hollow tree or a fox hole ?
> > >
> > >
> > > After the meeting, Rong Da first showed me two radio kits, one of which was a three-tube rifle kit that brought back memories of my junior high school days.
> > >
> > > So Rong Da owned a Rifle Kit in his Jnr High. It's good that he was respectful and did not take itto school with him as far as he has let us know !!! TEF It shows the advantage of respecting one 's parents - to end up as an Adjunct professor in EE and radio tech and not in a Chinese jail.
> > >
> > >
> > > I used the classic bottle rack end feed, and used Rongda's antenna, connected to QMX, opened JTDX, and made a few neon stations When switching to 18 MHz, the transmission signal interfered with the USB port, and the connection between the computer and QMX was interrupted. At this time, the ADX-S connected by Bluetooth showed the advantage of not being affected by RF interference. Rongda also made a few FT8 QSOs by using an Apple phone to connect to the ADX-S.
> > >
> > > Neon stations - international ones ??
> > > Steve JOb's Apple phone wins yet again I see.?
> > >
> > > Later, with the arrival of Xu Ya, as well as BH4GUU and BH4FGJ, everyone started technical exchanges. Rong Da and Xu Ya, as old hands, shared their experiences in DIY and antennas.
> > > In the afternoon, we continued the field work in an open-air teahouse.
> > >
> > >
> > > It's worth noting that that in Holland a " TEa house " is where you go to buy and smoke "Mary Jane " or Marijuana. I think the Chinese Tea house serves real tea . Dutch hams will confirm that this is not an AngloSaxon Joke or Slur about Holland. Everyone knows this is a fact.?
> > > TEF.
> > > =======================================================================
> > > Conclusion on the Greatness or not of AI -
> > >
> > > So any time someone says - human translators are redundant. AI can do it all... 100% flawless. I think WE need another 5 Year plan or Great leap Forward in this area , (that said, the ideograms were all Greek to me before I pushed the button to translate)
> > >
> > > for at the moment auto translation is pretty childish and prone to corrupt meanings.
> > >
> > > BTW there is an option to use a new Dpack type Mosfet for the Qdx - this is external llto Hans. Someone called Jimkits on Rock of Gibraltar is offering a PCB and the two devices. Device has a Vgd max of 150 V and Cin of about 55pF which compares well to two off x 2 BD 170.. The proof in the pudding his how long that pair lasts in the field. They weouldbe perfect for the first stage of a 15 W SSB amp that would take around 100 mW x 50 ohms up to 15 amp, simply because they have the capacity to survive the 60-70 mA x 12 V bias heat load that the BS 170 pair has difficulty doing (1 Watt standing dissp per device in a To92 case is a bad business unless that device is made of the Magic Silicon.) .
> > >
> > > I refer to the schematic of the 10 W amp that Hans offers , which uses a driver cct cut from the Softrock Ensemble from Tony Parkes. (Borrowed if you like..).
> > >
> > >
> > > Timothy E. Fidler : Engineer BE Mech Auckland?
> > > Telephone Whangarei 022 691 8405
> > > e: Engstr@...
> > >
> > >
> > > >
> > > > ----- Original Message -----
> > > >
> > > > From:
> > > > [email protected]
> > > >
> > > >
> > > > To:
> > > > <[email protected]>
> > > >
> > > > Cc:
> > > >
> > > >
> > > > Sent:
> > > > Tue, 4 Jun 2024 20:17:20 +0800
> > > >
> > > > Subject:
> > > > Re: [CRKits] ADX-S V2!
> > > >
> > > >
> > > >
> > > > Guys,
> > > > 3 days ago, BD4AHS brought his QMX to join my POTA using ADX-S V2 in Century Park in Pudong Shanghai. We had a great day together.
> > > > His report: https://mp.weixin./s/0LPC5npaowuVmXThAreV3A
> > > > My report: https://mp.weixin./s/XCgko4Y9toelyoX1g06N9w (https://mpweixin./s/XCgko4Y9toelyoX1g06N9w)
> > > > Thanks,
> > > > Adam
> > > > ÔÚ 2024/5/7 22:48, Adam Rong via groups.io дµÀ:
> > > > > Guys,
> > > > > Please treat this message as the formal announcement to the worldwide. ADX-S V2 is now ready to take big volume orders. Actually I already shipped a big box to a builders' group in Europe earlier today.
> > > > > I live near a big park in Shanghai and I operate ADX-S a lot in the park. With the popularity of FT8CN and iFTx Apps, I realized that I must design for the mobile devices for field digital modes operation. That's why I have added features like TCXO, Audio Cable Adapter and Bluetooth Module.
> > > > > RX modifications are incorporated in the V2 hardware so you can easily toggle ATT while you are suffering from strong BCI.
> > > > > Band module automatic detection and TCXO addition make the setup and alignment much easier. In most of the occasions, you can save the frequency calibration and band setting.
> > > > > Hate toroids winding like me? Now you just need to wind 11 toroids instead of 21 to support 7 bands.
> > > > > Hate desoldering the Arduino Nano module? Low profile sockets are provided in the kit so you can easily replace if necessary, and meanwhile keep the total height to fit in the original plastic box.
> > > > > Photos? They look the same as the ADX-S. Only difference is the main board.
> > > > > The price is 89 USD including tracked air shipping. Please place order through the web store at:
> > > > > > http://crkits.com
> > > > > The assembly manual, schematic, part list, source code, and firmware update tools are now available for download from:
> > > > > > /g/crkits/files/ADX-S/V2
> > > > > You are welcome to spread the word to your local group or club. Third party review videos will be available soon and I will let you know the link.
> > > > > Thanks,
> > > > > Adam
>
Timothy Fidler
