- Original Message -
From: Gian
Subject: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
I know it may sounds or looks strange, but I have been assembling ugly
style circuits using all or most SMD components, active and passive. A
simple circuit of a 2xJ310 (MMBFJ310
-
From: Gian
Subject: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
I know it may sounds or looks strange, but I have been assembling ugly
style circuits using all or most SMD components, active and passive. A
simple circuit of a 2xJ310 (MMBFJ310) is shown in a picture I
- Original Message -
From: netnovel2005 ja7...@zao.jp
To: soft_radio@yahoogroups.com
Sent: Wednesday, January 27, 2010 6:18 PM
Subject: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
Hello,
I answered to Mr. hank by personal mail
To: soft_radio@yahoogroups.com
Sent: Friday, January 29, 2010 1:25 AM
Subject: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
Bob, I certainly don't want to scare anyone away from trying SMT assembly
at home, and my remarks have nothing to do with the fact that I'm offering
assembled
I definitely agree with Larry about the SMT soldering techniques. SMT assembly
is not bad IF you use the right tools and techniques. I will be posting some
more info on that on my blog, probably tomorrow, but one of the things you
should NEVER do (in my opinion, that is) is use wire solder
Hi Pete,
Sorry, but the statement about 'NEVER' hand soldering SMD components is simply
scaremongering!
SMD components can easily be soldered by hand, and that is a far more reliable
method for home construction than any of reflow or other crazy methods often
attempted by amateurs. Those
...
Dave
G4UGM
-Original Message-
From: soft_radio@yahoogroups.com
[mailto:soft_ra...@yahoogroups.com] On Behalf Of Dave - WB6DHW
Sent: 28 January 2010 22:19
To: soft_radio@yahoogroups.com
Subject: Re: [soft_radio] Re: LD-1 Discussion on
Garage-shoppe.com Blog
Peter
be put of if you
don't
have one...
Dave
G4UGM
-Original Message-
From: soft_radio@yahoogroups.com
[mailto:soft_ra...@yahoogroups.com] On Behalf Of Dave - WB6DHW
Sent: 28 January 2010 22:19
To: soft_radio@yahoogroups.com
Subject: Re: [soft_radio] Re: LD-1 Discussion on
Garage
@yahoogroups.com
Subject: Re: [soft_radio] Re: LD-1 Discussion on
Garage-shoppe.com Blog
Peter:
The procedure is to solder the ssop pins and not worry
about shorts.
Then use solder wick to remove the shorts. Easier than it
sounds. Many
have done this with IC's with .020 pitch
Hi
Maybe we should just re-name this thread the generic thread we used for a few
weeks for just about everything
It did indeed get me to order the LD-1 though.
Bob
Hank
- Original Message -
From: larryw8er robi...@roadrunner.com
To: soft_radio@yahoogroups.com
Sent: Monday, January 25, 2010 9:12 PM
Subject: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
Peter ... The Soft66AD is assembled and shipped at $122. The problems
, 2010 9:12 PM
Subject: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
Peter ... The Soft66AD is assembled and shipped at $122. The problems are
with support and documentation and drivers/software. My experience is that
emails are often not answered and telephone contact
, 2010 5:45 PM
Subject: Re: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
Hank:
I only had a chance to take a quick look at the schematic. It appears
that there is a thru position in the bandpass circuit that selects
bandpass filter. You should be able to use that below 2.1 MHz
Sent: Sunday, January 24, 2010 2:13 PM
Subject: Re: AW: AW: AW: AW: [soft_radio] Re: LD-1 Discussion on
Garage-shoppe.com Blog
Hi
A full wave rectifier can also be used as a simple broad band doubler.
The problem with the output of the DDS is that without filtering it is far
from
Hank, the price goes up to $200 in about a week and a half. I think it's worth
that. I see that the Soft66AD costs $125, plus shipping from Japan, but you
have to put it together yourself. If you do that, I would advise you to use
better surface-mount techniques than the ones recommended on
: [soft_radio] Re: LD-1 Discussion on
Garage-shoppe.com Blog
Hi
A full wave rectifier can also be used as a simple broad band doubler.
The problem with the output of the DDS is that without filtering it is far
from symmetrical in the upper octave. Some use bandpass filtering
Hi, Stephan! Yes, it uses a Tayloe detector, and the preselector filters are
all third order.
It's my understaniding that even the classic diode-ring mixers are really
switching mixers, because the diodes in effect hard-limit the LO. In the
frequency domain, using a Tayloe detector (or any
: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
Hi, Stephan! Yes, it uses a Tayloe detector, and the preselector filters are
all third order.
It's my understaniding that even the classic diode-ring mixers are really
switching mixers, because the diodes in effect hard-limit the LO
: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog
Hi, Stephan! Yes, it uses a Tayloe detector, and the preselector filters are
all third order.
It's my understaniding that even the classic diode-ring mixers are really
switching mixers, because the diodes in effect hard-limit the LO
Hello Bob!
Yes, thats the reason why the the RXs with only one frequency generator
(like SDR 1000, or firefly) run at 4x RX frequency. They use the higher
frequency to generate the two signals with 90 degrees shift at 2x RX
frequency for I/Q generation.
So in order to receive for example 30
Hi
I think you will find that with the two DDS's at 90 degrees to each other you
have sin(wt) and cosine(wt). That lets you do a multiply on each and ultimately
get both the I and he Q signals you need.
Another way to look at it:
If you have 0 and 90 degrees out of the two DDS's, that gives
Hi Bob!
I'm not a native english speaker, thats why I maybe not understand what you
ment?!
From what I know is:
- you need (normally) double sampling rate from that frequency that you want
to sample (Nyquist, 60 MHz sampling rate for 30 mhz frequency)
- in addition to the above said for
Hi
My assumption is that the DDSs run with a sample clock at 2x the 37 MHz. The
chip is rated to go to 75 MHz on the sample clock input. That would give you a
maximum clock output frequency of 75 / 2 = 37.5 MHz.
Normally you can't actually use an output that close to the Nyquist frequency
and
To: soft_radio@yahoogroups.com
Sent: Sunday, January 24, 2010 10:04 AM
Subject: AW: AW: AW: AW: [soft_radio] Re: LD-1 Discussion on
Garage-shoppe.com Blog
Thanks for your explanations, Bob!
I understand the principles of driving the mixer with a squarewave signal and
that you use
Hi
I believe the input clock on the DDS is 75 MHz. The data sheet for the DDS
shows that as a correct input clock for the chip.
From that the Nyquist is 37.5 MHz. The output of the DDS will go to 37 with a
crazy filter. That output forms the LO (or clock if you prefer) for the mixer.
Bob
This is a mixer, you are not trying to digitize the 30MHz signal
where you would need a minimum of two samples, instead you are mixing
it down to the base band.
Ahh, ok, yes. This is where I made the mistake! You're right!
But I'm still interested in mixer type and bandpassfilters of the
Stephan Schaa wrote:
Thanks for your explanations, Bob!
I understand the principles of driving the mixer with a squarewave
signal and that you use a comparator to change sine to squarewave.
Where I'm failing at is the trick how to receive 30 mhz with a DDS
that make 37 MHz max
g4...@...
To: soft_radio@yahoogroups.com
Sent: Sunday, January 24, 2010 1:56 PM
Subject: Re: AW: AW: AW: AW: [soft_radio] Re: LD-1 Discussion on
Garage-shoppe.com Blog
k5nwa wrote:
At 12:04 PM 1/24/2010, you wrote:
Thanks for your explanations, Bob
24, 2010 1:56 PM
Subject: Re: AW: AW: AW: AW: [soft_radio] Re: LD-1 Discussion on
Garage-shoppe.com Blog
k5nwa wrote:
At 12:04 PM 1/24/2010, you wrote:
Thanks for your explanations, Bob!
I understand the principles of driving the mixer
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