Hi Mark,
Yes I am interpreting it the other way, ie the "spurious emissions
attenuated by ... the lessor of (23,70) == 23dBc for very low power signals.
However it's a bit confusing and you (and Glen) might be right . I
will seek clarification from ACMA. It may also be different in other
An: freetel-codec2@lists.sourceforge.net
Betreff: Re: [Freetel-codec2] FreeDV data mode
When the Pluto came out, I had to have one. Playing with it kind of left me
saying "meh" because it didn't seem to have much RX gain. I needed a beam to
focus on the transmitter.
I then tried the Li
David, looking at that link and plots you sent, that radio will not meet
community and other band user spectral purity expectations.
At UHF, It needs to be better than -70dBc in an SSB Bandwidth immediate
adjacent
At 1MHz away, -110dBc in an SSB BW...
and proportionally better at lower
I doubt it will meet adjacent channel, and in-band noise community
expectations.
What is the noise level 10kHz and 100kHz away, in an SSB bandwidth ?
(dont measure in 1Hz BW, measure in the wide band and convert)
g
On 10/08/2020 7:52 am, David Rowe wrote:
With the addition of a LPF I
Toko filters are a few dollars retail.
On August 9, 2020 11:14:34 PM UTC, Steve wrote:
>I may have to download Elsie then and grab a pencil to make some
>coils...
>:-)
>
>http://www.tonnesoftware.com/elsie.html
>
>
>
>On Sun, Aug 9, 2020 at 6:02 PM Adrian Musceac
>wrote:
>
>> The Pluto receiver
I may have to download Elsie then and grab a pencil to make some coils...
:-)
http://www.tonnesoftware.com/elsie.html
On Sun, Aug 9, 2020 at 6:02 PM Adrian Musceac wrote:
> The Pluto receiver is useless without proper filters as it will receive
> everything at the same time. With filters, it
The Pluto receiver is useless without proper filters as it will receive
everything at the same time. With filters, it works fine, I managed more than
800 km on FT8 with it last winter, I talked a little bit about it at SDRA.
Adrian
On August 9, 2020 9:59:53 PM UTC, Steve wrote:
>When the
On Sun, Aug 9, 2020 at 5:51 PM David Rowe wrote:
>
> I wonder if that was a configuration thing Steve, at max analog gain the
> noise figure of the Pluto (AD9363) is specified at just 2.5dB - better
> than many other SDRs and hardware-defined Ham radios.
>
> Gain is pretty cheap in SDRs, once
> When the Pluto came out, I had to have one. Playing with it kind of
> left me saying "meh" because it didn't seem to have much RX gain. I
> needed a beam to focus on the transmitter.
I wonder if that was a configuration thing Steve, at max analog gain the
noise figure of the Pluto (AD9363) is
When the Pluto came out, I had to have one. Playing with it kind of
left me saying "meh" because it didn't seem to have much RX gain. I
needed a beam to focus on the transmitter.
I then tried the LimeSDR-Mini but that thing only lasted about a year
and then failed. Expensive junk. Comparably, the
With the addition of a LPF I believe it meets the spectral purity
requirements of the Amateur LCD on 2M:
http://www.rowetel.com/?p=7207
and on HF:
http://www.rowetel.com/?p=6317
- David
On 10/8/20 6:50 am, glen english wrote:
> except that the Pi transmitter has unacceptable spectral
except that the Pi transmitter has unacceptable spectral purity.
On 9/08/2020 7:18 pm, Adrian Musceac wrote:
Thanks David for the news.
One question: how high can the Pi transmitter go in frequency?
Our 70 cm band is pretty crowded, but the 23 cm band and 2305-2400 MHz
bands are underutilized
Hi Adrian,
The RpiTx doc suggest 1.5GHz, but I haven't tried it. Suspect it gets
"noisier" as freq increases, however as the power is so low it may still
meet spurious requirements.
Cheers,
David
On 9/8/20 6:48 pm, Adrian Musceac wrote:
> Thanks David for the news.
> One question: how high can
Thanks David for the news.
One question: how high can the Pi transmitter go in frequency?
Our 70 cm band is pretty crowded, but the 23 cm band and 2305-2400 MHz bands
are underutilized and we want to make use of them. The Pi/RTL system is a good
candidate because of price.
Adrian
On August 9,
Hi Adrian,
You data mode (and HNAP) sound pretty cool. Thanks, I enjoyed the SDRA
HNAP talk by Lukas, that's quite a sophisticated system.
-/-
A couple of recent developments in this area by Bill, VK5DSP, and myself:
1/ We have ported the 4FSK/LLR/LDPC code work to C in this PR
Hi David,
I've watched with interest your recent foray into FreeDV data transmission.
There's a new and interesting project called HNAP (https://hnap.de ) which has
the same goals (long distance IP links). The project is well described in this
year's SDRA talk by Lukas O.
Inspired by both your
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