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Re: Requested Files

Rob
 

开云体育

Do you have access to these files?

if yes

download them...?

because

I don't have access to those files when I sign into qrp-tech because..... it says I am not a member of that group.



On 11/06/2019 04:10 PM, Karl Heinz Kremer wrote:

You need to get these files from the old arp-tech group:?

/g/qrp-tech/files/Winter%202018%20Project%20%231%20--%20%20NorCal40A%20qrp-tech%20PCB

de Karl Heinz - K5KHK

Re: Requested Files

 
Edited

I downloaded all the files yesterday. I will email them to you.

EDIT: Your Zed page has no email address. Shoot me an email if you still want the files, I have the Gerbers as well as all the documentation Chuck produced and more. I'm good at QRZ.
Re: Requested Files

[email protected]
 

Thanks Bill!
I sent you a note...didn't realize at the time you're right across the river... :)
t
Re: Requested Files

 

Tom - I am late to this party. What you are looking for? If you need an NC40 board, I have an extra. I have to dig it up but that shouldn't be hard.? If you need the NC40A files, that is a little harder because Chuck (the mod-owner of that list) has forbidden anyone from moving them from the qrp-tech files area. Why don't you contact me off list and I will see if I can help you.? 73 Bill
Re: Requested Files

[email protected]
 

Heh,heh...good to know I'm not going nuts!? thanks for the feedback.?
Ok ...uh...anyone out there part of that group and in possession of the files? Or boards you want to part with? :)
Tom Hauff WB7RTE
Vancouver, WA?
Re: Requested Files

 

That is definitely the problem. You need to be a member of the group in order to see the files. Perhaps another member who is that a computer can copy it for you and put it here or else email it to you. I'm not at a computer or otherwise I would take care of it myself :-)

--
--
Ryan Flowers W7RLF
https://miscdotgeek.com
Re: Requested Files

[email protected]
 

Thanks men, but I'm not seeing any link.?
When I click this:?/g/qrp-tech/files/Winter%202018%20Project%20%231%20--%20%20NorCal40A%20qrp-tech%20PCB
it just takes me to the [email protected]?page. There is no zip file to download. And on that page it reminds me that my subscription has not been approved. Perhaps that is why no files link shows up. But as I said, no one seems to be monitoring that page for new members.?
It's a conundrum! lol...
t
Re: Requested Files

 

Tom, click on the link and download the zip file to get the gerbers.? There is a BOM file also.? While you are at it, download the whole directory.? Everything you will need is there.? Regards, Dale

On Wed, Nov 6, 2019 at 3:54 PM <wb7rte@...> wrote:
Hey K!
...yeah that's what I was thinking...but no one seems to be answering there.
I contacted Chuck Adams (K7qo) about them (since he helped build them) and he said he didn't have any of those things. He pointed me to "the site" -- Not sure where he was thinking but there weren't any files or boards for sale that I could see.?
Thanks for the link...but I don't see any files listed there and no one's monitoring membership as far as I can tell.?
still searching...?
Tom



--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256
Re: Requested Files

 

Tom,
The Gerbers are the second to last file. It's a ZIP file and usually you can just upload those to a PCB printer's website and they should load fine. Good luck!
Re: Requested Files

[email protected]
 

Hey K!
...yeah that's what I was thinking...but no one seems to be answering there.
I contacted Chuck Adams (K7qo) about them (since he helped build them) and he said he didn't have any of those things. He pointed me to "the groups.io site" -- Not sure where he was thinking but there weren't any files or boards for sale that I could see.?
Thanks for the link...but I don't see any files listed there and no one's monitoring membership as far as I can tell.?
still searching...?
Tom
Re: Group Introduction: If you're going to post on the group, reply here!

 

Thanks for keeping this up!

John KJ4IFO
Re: NC-40 Multiband??

Bob Macklin
 

开云体育

What is wrong with the 9850 if you use the square wave outputs?
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"

----- Original Message -----
Sent: Wednesday, November 06, 2019 12:43 PM
Subject: Re: [qrptech] NC-40 Multiband??

There is only one reason why DDS can't be used, you need a good one
not the 9850.

Otherwise yes a DDS would replace the VFO and mixer plus the LO filter.

However use the si5351, generally more available, cheaper and good from a
few khz to over 100mhz.? You still need the Arduino and LCC and a rotary
encoder.? Basically the same scheme as Raduino (used for the uBitx).

FYI the square wave output from the 5351 is compatible with DBMs with
an attenuator and 602/612 with a attenuator (need only 300mV PP? and
the 5351 is about 3V PP)

The beauty of the Arduino and si5351 is a computer can tell it what
frequency and all.? the volume and otehr controls are sill analog but?
there are ways...

Allison

Re: Requested Files

 

You need to get these files from the old arp-tech group:?

/g/qrp-tech/files/Winter%202018%20Project%20%231%20--%20%20NorCal40A%20qrp-tech%20PCB

de Karl Heinz - K5KHK
Re: NC-40 Multiband??

 

FYI the K1 and K2 stuck with relays as diodes not done really well can
really hurt?the receiver overload capability.? It shows as back when the
K2 was top of Bob Sherwoods list for RX performance.? Simple done well.

Also diode switching at power is harder to get right, even a few watts.
Antenna switching for QSK however can be done but with great care.
The yabut is that the RX agc(if used) needs to recover fast enough
to work.

Allison
Re: NC-40 Multiband??

 

There is only one reason why DDS can't be used, you need a good one
not the 9850.

Otherwise yes a DDS would replace the VFO and mixer plus the LO filter.

However use the si5351, generally more available, cheaper and good from a
few khz to over 100mhz.? You still need the Arduino and LCC and a rotary
encoder.? Basically the same scheme as Raduino (used for the uBitx).

FYI the square wave output from the 5351 is compatible with DBMs with
an attenuator and 602/612 with a attenuator (need only 300mV PP? and
the 5351 is about 3V PP)

The beauty of the Arduino and si5351 is a computer can tell it what
frequency and all.? the volume and otehr controls are sill analog but?
there are ways...

Allison
Requested Files

[email protected]
 

HI all!
New to the group -- and looking for some items: I purchased the book "The Electronics of Radio" and as many have noted it uses a NorCal 40A as a model. I can't find the PCBs or the Gerber files. Any help would be great friends! :)
I'm Tom...
WB7RTE
Re: DDS VFO!

 

They have one thing going for them, very pow power consumption.

I started playing with DC receiver back in the 70s.? Looked promising
but they were not all that.? Like regens, the are useful.

the HW9 was the solid state version of HW16,? a superhet RX with filter
and decent keying.? Also still low power.

With DBMs or SA612 added to the recognition that ladder filters are
relatively easy and huge IF gain is not needed superhets became simpler.

I've applied those ideas to tube based RX and ended up with a good
receiver in 3 tubes. Those being? 6AU8 mixer oscillator, ladder filter,
6BE6 product detector, 6GW8 audio preamp and power amp.? Other
choices are also possible.? The 6BE6 or 6AR8 being close to a vacuum
tube version of the SA612 for mixers.

Allison
Re: DDS VFO!

Bob Macklin
 

开云体育

I know about the potential problems of DC receivers. That's why I have always avoided them.
?
I know the HW-8 was better than the HW-7. But a lot of both were sold.
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"

----- Original Message -----
Sent: Wednesday, November 06, 2019 10:23 AM
Subject: Re: [qrptech] DDS VFO!

NC-40 has a crystal filter and that would be a good RX in its own.

Attached the receiver schematic.? Its roughly the same as K1 and 1W (kitsandparts.com).
Generally much better than DC rx.

Direct conversion the best of the lot are the Tentec century 21 and 22.
The HW8 was the best in the heath line.
the problem is the Image frequency can be hear so if you have a CW
signal tuned in right there can be another guy on the other side your can hear.
The other issue (operator training) is if you tun in a station on the wrong side
you can call him till your worn out as he is not listening there.?
The upside to DC RX is with a good audio filter the receiver can
sound very good.

Allison

Re: NC-40 Multiband??

Bob Macklin
 

开云体育

Yes,
?
I went back and looked at the manuals on the Sierra, K1, and K2.
?
They all use the? same scheme where they mix the VFO with a crystal and use that product for the Rx (Tx) LO.
?
The crystal frequencies are the same on all three designs.
?
Why can't a DDS be used?
?
The DDS can be programmed for the mixed frequency and used directly.
?
Do you want single band or multiband? For multiband you can use a off board switched bandpass filters similar to the way Burdick did it.
?
But I would look at PIN diode switching rather than relay switching.
?
Or you can do it with the analog VFO and crystal mixer the way Burdick did it.
?
My goal is to have a transceiver that I can run from a computer.
?
I'm 85 years old and I have problems with my hands and hearing.
?
But I still like radios.
?
I hope I live to 90 so I can possibly see better propagation again.
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"

----- Original Message -----
Sent: Wednesday, November 06, 2019 10:13 AM
Subject: Re: [qrptech] NC-40 Multiband??

OK ,
First the Norcal sierra is single conversion with a 4.915mhz IF. See schematic!
There is no 8mhz IF or front end.? It is able to band switch using plug in boards.
That could be relay switched but its a lot of relays (looks like 6 per band for
clean switching)

Dialing it in for 8mhz is doable and maybe easier for a monoband chassis
like NC40 but less trivial for the neophyte builder.? As the basic chasis
carries the transmitter and the traansverter (that's whats being proposed)
need to be interposed between the Tx mixer and the actual transmitt
power chain.? ?Conceptually easy much harder to do in practice.


It is unique a its one of the few ith VFO and usis a convershon scheme to hit?
other bands as needed.? The Elecraft K1 is very close in design.? That means
same crystals.

For both you need band pass filters, low pass filters, and a filter in the VFO
conversion for the band choice.

Norcal those are PMO filter, with matching crystal,
TX BPF
RX BPF
TX LPF.

For the NC-40 its about the same game save for you really need a digital VFO
and not 9850 based though the Si5351 does work well for that.? The bigger
issue the NC40 was a monoband radio from the start and lacks easy change
points for multiband.

For either:
The 4.915 IF you need four matched in frequency to get a good CW filter.
A frequency counter and a simple oscillator circuit works for that.?

?kitsandparts.com can supply them matched for $1.50 each.
? ?The Norcal Sierra needs 7 total.? 5 are in the filters? rest are bfo/Tx offset
? ?The NC40 requires 6.? ?4 are in the filters? rest are bfo/Tx offset

Allison

Re: Do you have a favorite home brew short wave receiver to build with scouts?

 

Look up the Kitchin Scout regen.??

Allison
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