Date   
Re: No 2m but still an APRS igate?

Perry Chamberlain <canoeman@...>
 

That is a great idea, nice........... Im liking it even more .


 He said:
"Here's the good news though.  If you have a current igate on 2m, you can replace the computer with a UDR56K, attach a USB-to-Serial cable  to the TNC and radio to continue to service the 144.39 net, while offering 9600 baud or better APRS on the UDR56K's 70cm radio.  Then you would have a dual band igate with less power requirement (by loosing the computer) and a much smaller package.  Attach a diplexer and dual band antenna and you are ready to go."

Respectfully

Perry Chamberlain


On May 22, 2012, at 11:29 AM, "John D. Hays" <john@...> wrote:

Here's the good news though.  If you have a current igate on 2m, you can replace the computer with a UDR56K, attach a USB-to-Serial cable  to the TNC and radio to continue to service the 144.39 net, while offering 9600 baud or better APRS on the UDR56K's 70cm radio.  Then you would have a dual band igate with less power requirement (by loosing the computer) and a much smaller package.  Attach a diplexer and dual band antenna and you are ready to go.

Re: No 2m but still an APRS igate?

Bill Vodall <wa7nwp@...>
 

(FSK, GMSK, 4FSK) and baud rate (4800-56000) would be selected and the
proper application loaded and run.  Any trackers would need to match the
same combination.
No 1200 baud? :-( True it's overkill for a UDR but it could be
useful at times...

Bill

Re: Activity in Statesboro-Savannah Area?

Perry Chamberlain <canoeman@...>
 

The icom ID-31A has built in gps, and its already forwarding Dprs packets  under dstar, to the findu IS.
But this radio looks like it will have so many  more uses. Hope it doesnt take too long for this to come out. (impatient ham)
I mean, wow, a built in linux machine.   :-)



Respectfully

Perry Chamberlain


On May 22, 2012, at 11:48 AM, "qrv@..." <qrv@...> wrote:

 

Is anyone from the Statesboro-Savannah (GA-USA) area
involved yet?

Integrated APRS/D-Star systems sound like an excellent
redundant-wireless communication network to backstop
vulnerable wired, cellphone, and Internet networks.

Integrating the currently isolated strings of networks
on 2/220/440/9600 plus APRS and D-Star deepens the density
of redundancy.

Developing 440 makes sense, as does folding-in 9600 and
220, along with 2M.

--

Thanks! & 73, KD4E.com

David Colburn - Nevils, Georgia USA

Android for Hams: groups.yahoo.com/group/hamdroid

Restored to design-spec at Heaven's gate 1Cor15:22

Re: Codec2

"craigkv5e" <stauros@...>
 

No it is not, Craig

--- In UniversalDigitalRadio@..., Perry Chamberlain <canoeman@...> wrote:

Is it interoperable with the AMBE CHIP embedded radios?


Respectfully

Perry Chamberlain


On May 22, 2012, at 9:17 AM, "nikropht" <nikropht@...> wrote:

I wanted to let this group know about the progress on Codec2. Codec2 is a fully open source DV codec being developed as a replacement for AMBE2000 see http://www.codec2.org/ for details.

-Mike
KD5QLN

Re: No 2m but still an APRS igate?

Perry Chamberlain <canoeman@...>
 

Byonics tried to get a line of 440mhz trackers up, but no one was interested. Maybe now.


Respectfully

Perry Chamberlain


On May 22, 2012, at 12:12 PM, Bill Vodall <wa7nwp@...> wrote:

 

> (FSK, GMSK, 4FSK) and baud rate (4800-56000) would be selected and the
> proper application loaded and run.  Any trackers would need to match the
> same combination.

No 1200 baud? :-( True it's overkill for a UDR but it could be
useful at times...

Bill

Re: No 2m but still an APRS igate?

"richark" <richark@...>
 

I don't think there is a 'universal' APRS channel for 70cm, like 144.39 is for 2m. Here in the Northwest, we use 440.800 for 9k6 APRS.

Not sure how official this list is, but it provides other alternatives around the world.

http://info.aprs.net/index.php?title=Frequencies

73,
Kenny, KU7M

--- In UniversalDigitalRadio@..., Sander Pool <sander_pool@...> wrote:


I will tune my igate to 445.925 and see what I pick up over the next few
days. Near as I can tell all local (CT/NY area) users are on 144.390 but
maybe I'm missing out on a lot of traffic. I will also run my mobiles on
that frequency to see if any other igates are listening. I don't think
igates announce their frequency but if non-144.390 is common in the US
it should probably be included so you can see on aprs.fi and other servers.

73,

Sander W1SOP

On 5/22/2012 2:01 PM, Perry Chamberlain wrote:
The 440 aprs packet frequency used is 445.925. In some areas, its dead
quiet, in some its packed.
But there are 440 freqs to use aprs. It just means you have better
propagation, no collisions and as long as your igated, it goes to the
WEB apr IS.

Re: Activity in Statesboro-Savannah Area?

"John D. Hays" <john@...>
 

I went to Dayton and the one thing on my shopping list was an ID-31A (I have 3 other D-STAR radios).  I won an ID-31A as a door prize at the D-STAR Pizza dinner Thursday night!

Great little handheld.  I like that it keeps a database of D-STAR repeater locations (I need to refresh from http://www.dstarinfo.com/downloads-for-icom-software.aspx) and using the built-in GPS, I can select repeaters "near me" ...  cool.  It was fun as I passed through airports along the route.

I have already plugged a USB GPS into the UDR56K (CPU board) and loaded gpsd (a daemon many programs use for GPS data) - it loaded and worked right away.  Once the UDR56K is fully up, this will be the basis for sending GPS positions via D-STAR, APRS, AX.25, etc. :)  The mass storage is a microSD, so keeping a database of infrastructure (frequency, location, etc.) is a natural. 


John D. Hays
K7VE
PO Box 1223, Edmonds, WA 98020-1223 
  



On Tue, May 22, 2012 at 12:28 PM, Perry Chamberlain <canoeman@...> wrote:
 

The icom ID-31A has built in gps, and its already forwarding Dprs packets  under dstar, to the findu IS.
But this radio looks like it will have so many  more uses. Hope it doesnt take too long for this to come out. (impatient ham)
I mean, wow, a built in linux machine.   :-)



Respectfully

Perry Chamberlain

Re: Heard on the street

Nate Bargmann <n0nb@...>
 

* On 2012 22 May 13:49 -0500, qrv@... wrote:
Apple, Linux, and Microsoft all use a "windows" type
of gui - there is nothing whatsoever unique about the
MS implementation.
Except that people are familiar with MS Windows' bugs and warts and when
shown a Linux desktop and hear, "Just like Windows", the assumption is
that they will be using a bug-for-bug/wart-for-wart free replacement.
Such is not the case. Proper advocacy should avoid comparisions, of
which I am guilty.

People that claim Linux is too hard to use have either heard that from
some (to them) reputable source, or had to conjur up X mode lines long
ago. ;-) These days I find the automatic detection of most any piece
of hardware I've thrown at my current Linux systems make life much
easier than it must be for those using said devices on MS Windows where
the insrtuctions vary from plug/attach device to install driver software
first.

One neat new development is the kinect-type in-the-air
interface where hand-gestures replace a physical mouse.

Voice interfaces have finally crossed a threshold of
accuracy where they also alter the way that we control
devices. Accessibility for handicapped users and mobile
ops are obvious apps.
Ummmm, given the mood I can find myself in at times, the software had
better filter out certain gestures and words from its action command
list!

Exciting times!
Indeed. This project instantly piqued my interest.

73, de Nate >>

--

"The optimist proclaims that we live in the best of all
possible worlds. The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us

Re: Activity in Statesboro-Savannah Area?

Sander Pool <sander_pool@...>
 


I agree that's a great feature. I think Kenwood missed an opportunity with the D72 to do the same. How easy would it have been to allow coordinates to be stored with memory items and then show the 10 nearest based on the internal GPS. Just a matter of code :)

73,

    Sander W1SOP

On 5/22/2012 3:47 PM, John D. Hays wrote:
  and using the built-in GPS, I can select repeaters "near me" ...  cool.  It was fun as I passed through airports along the route.

Re: Heard on the street

"qrv@..." <qrv@...>
 

Those who have gone through the last 3 iterations of MS versions
of windows can now easily be told (and understand) that "Adjusting
to Linux is just like adjusting to Vista after you were used to XP."

The difference is no more radical than that - unless one chooses
to go with amore experimental distro.

It's exciting to see more Ham apps and gear moving to Linux.

Nate Bargmann wrote:
* On 2012 22 May 13:49 -0500, qrv@... wrote:
Apple, Linux, and Microsoft all use a "windows" type
of gui - there is nothing whatsoever unique about the
MS implementation.
Except that people are familiar with MS Windows' bugs and warts and when
shown a Linux desktop and hear, "Just like Windows", the assumption is
that they will be using a bug-for-bug/wart-for-wart free replacement.
Such is not the case. Proper advocacy should avoid comparisions, of
which I am guilty.
--

Thanks! & 73, KD4E.com

David Colburn - Nevils, Georgia USA

Android for Hams: groups.yahoo.com/group/hamdroid

Restored to design-spec at Heaven's gate 1Cor15:22

Re: Codec2

Perry Chamberlain <canoeman@...>
 

Although this is something that should have been done ten years ago, and is cool amateur radio engineering, the hundreds, and hundreds  of thousands of dollars that has been spent on the AMBE CODEC EMBEDED equipment, is a massive barrier to this ever changing  the Dstar system. And why yaesu, has decided to come out with yet another digital mode, is baffling.
( just a note, I own 6 yeasu radios, so I am a yaesu fan)
But, thats what amateur radio is all about. But it would be nice if we could choose a common codec.
I'm financially entrenched in Icom  D-star now, so I'm locked in.



Respectfully

Perry Chamberlain


On May 22, 2012, at 9:17 AM, "nikropht" <nikropht@...> wrote:

 

I wanted to let this group know about the progress on Codec2. Codec2 is a fully open source DV codec being developed as a replacement for AMBE2000 see http://www.codec2.org/ for details.

-Mike
KD5QLN

Re: Codec2

Matthew Pitts <daywalker_blade_2004@...>
 

Not directly, no. It is possible to communicate between them with software acting as a bridge between the two, though I haven't actually written the application that will do so. I am also thinking of allowing for normal voice; the D-Star Protocol does include a bridge that allows analogue voice and callsign routing, but this hasn't been implemented by Icom, nor has Jonathan done so, to my knowledge.

Matthew Pitts
N8OHU


From: craigkv5e
To: UniversalDigitalRadio@...
Sent: Tuesday, May 22, 2012 3:30 PM
Subject: [UniversalDigitalRadio] Re: Codec2

 
No it is not, Craig

--- In UniversalDigitalRadio@..., Perry Chamberlain wrote:
>
> Is it interoperable with the AMBE CHIP embedded radios?
>
>
> Respectfully
>
> Perry Chamberlain
>
>
> On May 22, 2012, at 9:17 AM, "nikropht" wrote:
>
> > I wanted to let this group know about the progress on Codec2. Codec2 is a fully open source DV codec being developed as a replacement for AMBE2000 see http://www.codec2.org/ for details.
> >
> > -Mike
> > KD5QLN
> >
> >
>



Re: Codec2

"David Lake (dlake)" <dlake@...>
 

CODEC 2 is currently missing any FEC, and will not operate down at the required bit-rate to be usable in D-Star.  It’s getting there, but I think it has a way to go so don’t expect a swap-out any time soon.

 

Now, the Yaesu offer (currently) is a dPMR-based FDMA system.   But it does look like they will be going to a DMR TDMA system in the future.

 

dPMR and DMR both use AMBE2+ - not compatible directly with AMBE2 in D-Star, but DVSI have (very cheap) chips that can do both modes.  And of course you can transcode between them, either in software if someone is willing to pay DVSI $,000s for the SDK, or in hardware if $20 is more in your budget.

 

So, what we need (as I proposed at Dayton) is an Open Amateur Trunking protocol that can transport all these different codecs, and then allow people to transcode between them.

 

Yes, you will be locked into D-Star for a while, but I don’t see why that should be a barrier to talking to someone on, say, a DMR-based system. 

 

David

 

From: UniversalDigitalRadio@... [mailto:UniversalDigitalRadio@...] On Behalf Of Perry Chamberlain
Sent: Tuesday, May 22, 2012 5:16 PM
To: UniversalDigitalRadio@...
Subject: Re: [UniversalDigitalRadio] Codec2

 




Although this is something that should have been done ten years ago, and is cool amateur radio engineering, the hundreds, and hundreds  of thousands of dollars that has been spent on the AMBE CODEC EMBEDED equipment, is a massive barrier to this ever changing  the Dstar system. And why yaesu, has decided to come out with yet another digital mode, is baffling.

( just a note, I own 6 yeasu radios, so I am a yaesu fan)

But, thats what amateur radio is all about. But it would be nice if we could choose a common codec.

I'm financially entrenched in Icom  D-star now, so I'm locked in.

 

 

Respectfully

 

Perry Chamberlain

 


On May 22, 2012, at 9:17 AM, "nikropht" <nikropht@...> wrote:

 

I wanted to let this group know about the progress on Codec2. Codec2 is a fully open source DV codec being developed as a replacement for AMBE2000 see http://www.codec2.org/ for details.

-Mike
KD5QLN




Re: Codec2

"David Lake (dlake)" <dlake@...>
 

OK now you're talking politics.



I do have a bridge running between D-Star and Echolink, but there are some admin areas that need to be fixed especially around identification.



The audio quality is actually surprisingly good (unless the incoming Echolink is from a repeater that has not filtered it's CTCSS tone out sufficiently in which case it is HORRIBLE).



It's not a production system purely for me to play with.



David



From: UniversalDigitalRadio@... [mailto:UniversalDigitalRadio@...] On Behalf Of Matthew Pitts
Sent: Tuesday, May 22, 2012 5:31 PM
To: UniversalDigitalRadio@...
Subject: Re: [UniversalDigitalRadio] Re: Codec2








Not directly, no. It is possible to communicate between them with software acting as a bridge between the two, though I haven't actually written the application that will do so. I am also thinking of allowing for normal voice; the D-Star Protocol does include a bridge that allows analogue voice and callsign routing, but this hasn't been implemented by Icom, nor has Jonathan done so, to my knowledge.



Matthew Pitts

N8OHU

Re: No 2m but still an APRS igate?

Joshua Mesilane <josh@...>
 

Hi All,

I LOVE what this radio stands for. I love the fact that it will be an open source radio, but is the hardware going to be open as well? PCB design, chip code, etc? Is the project going to be completely open source & open hardware, or only partially?

As for APRS. Here in VK we primarily use the 2m network with a nation-wide frequency of 145.175 and to a much lesser degree 70cm is used typically for experimental purposes. I run a 2m IGate at home using javAPRSSrvr and the idea of having this run on the device directly I think is exciting, however:

Will the radio be designed in such a way that if we wish to contribute to the project a "2m" version could be designed?
Are the RF components modular and would they allow for swapping? (So that third parties could easily design and produce open hardware alternative RF boards)
Is there any hope for an RS-232 port?

USB-Serial/USB devices in general are notoriously bad for crashing and rebooting in RF environments which can easily cause the serial port to lock up and you then need to remove and re-plug the serial port. I'm not so sure that I'd want to use my NMEA GPS via a USB/Serial adaptor (Or even an FTDI USB GPS) if it were going to be hard wired into a mobile installation. In that environment (IMO and in the field experience) RS232 is the only way to go. In some applications (Remote telemetry systems - And we're not just talking about HAM radio now) quite a lot of gear still uses RS232. I can see a MUCH wider use for this radio if the cost can be kept low, if it has interchangeable/configurable RF stage an RS232 capability. You could even aim for certification of the RF boards to comply with govt standards and market the product as an "open" alternative to the proprietary telemetry/data radios currently on the market.

Cheers,
Josh


On Wed, May 23, 2012 at 5:37 AM, richark <richark@...> wrote:
 

I don't think there is a 'universal' APRS channel for 70cm, like 144.39 is for 2m. Here in the Northwest, we use 440.800 for 9k6 APRS.

Not sure how official this list is, but it provides other alternatives around the world.

http://info.aprs.net/index.php?title=Frequencies

73,
Kenny, KU7M


--- In UniversalDigitalRadio@..., Sander Pool wrote:
>
>
> I will tune my igate to 445.925 and see what I pick up over the next few
> days. Near as I can tell all local (CT/NY area) users are on 144.390 but
> maybe I'm missing out on a lot of traffic. I will also run my mobiles on
> that frequency to see if any other igates are listening. I don't think
> igates announce their frequency but if non-144.390 is common in the US
> it should probably be included so you can see on aprs.fi and other servers.
>
> 73,
>
> Sander W1SOP
>
> On 5/22/2012 2:01 PM, Perry Chamberlain wrote:
> > The 440 aprs packet frequency used is 445.925. In some areas, its dead
> > quiet, in some its packed.
> > But there are 440 freqs to use aprs. It just means you have better
> > propagation, no collisions and as long as your igated, it goes to the
> > WEB apr IS.
>




Re: Codec2

Matthew Pitts <daywalker_blade_2004@...>
 

David,

Not intentionally, by any means; I was discussing a way to link Codec2 and D-Star with Tony VK3JED and Kristoff ON1ARF last fall or winter. I recently thought of finding a way to do this with open-source Echolink clients and D-Star, but haven't had time to experiment with it (working 56 hours a week tends to do things like that). Maybe you and I can work together instead of duplicating each other's efforts.

Matthew Pitts
N8OHU

------------------------------

On Tue, May 22, 2012 7:40 PM EDT David Lake (dlake) wrote:

OK now you're talking politics.



I do have a bridge running between D-Star and Echolink, but there are some admin areas that need to be fixed especially around identification.



The audio quality is actually surprisingly good (unless the incoming Echolink is from a repeater that has not filtered it's CTCSS tone out sufficiently in which case it is HORRIBLE).



It's not a production� system purely for me to play with.



David



From: UniversalDigitalRadio@... [mailto:UniversalDigitalRadio@...] On Behalf Of Matthew Pitts
Sent: Tuesday, May 22, 2012 5:31 PM
To: UniversalDigitalRadio@...
Subject: Re: [UniversalDigitalRadio] Re: Codec2








Not directly, no. It is possible to communicate between them with software acting as a bridge between the two, though I haven't actually written the application that will do so. I am also thinking of allowing for normal voice; the D-Star Protocol does include a bridge that allows analogue voice and callsign routing, but this hasn't been implemented by Icom, nor has Jonathan done so, to my knowledge.



Matthew Pitts

N8OHU

Re: No 2m but still an APRS igate?

"John" <john@...>
 

Hi Josh,


--- In UniversalDigitalRadio@..., Joshua Mesilane wrote:
>
> Hi All,
>
> I LOVE what this radio stands for. I love the fact that it will be an open
> source radio, but is the hardware going to be open as well? PCB design,
> chip code, etc? Is the project going to be completely open source & open
> hardware, or only partially?

This is a commercial product.  NorthWest Digital Radio has and is making significant investment to bring it to the marketplace.  The company's goal is to provide an open platform for amateur radio at an attractive price point.

The reality is that every modern piece of equipment has some proprietary intellectual property, and when someone manufacturers a product there is always a trade-off between cost and delivery.  It is often less expensive to buy parts than to make them, and when you buy parts you have to live within the terms of the purchase/license.  For example, to support many Digital Voice protocols you must use a proprietary Vocoder (this isn't just a D-STAR requirement, it applies to all current major Digital Voice protocols).  NWDR will offer a daughter card with a chip that does that, but can't reverse engineer and provide open source for intellectual property they do not own.

Sometimes you have to sign  restrictive agreements just to buy parts from some manufacturers.  This will be a barrier to sharing some low level details.

>
> Will the radio be designed in such a way that if we wish to contribute to
> the project a "2m" version could be designed?
> Are the RF components modular and would they allow for swapping? (So that
> third parties could easily design and produce open hardware alternative RF
> boards)

I won't comment on specific product plans (there are identified product concepts which will be worked on after the initial UDR is ready), but if this product sells well, that will motivate and help fund future products.  The basic design is such that the engineering to place the UDR is pretty straight forward for a few VHF/UHF bands.
 
> Is there any hope for an RS-232 port?

The design for the UDR56K4 is 1 Ethernet and 4 USB ports. 

>
> USB-Serial/USB devices in general are notoriously bad for crashing and
> rebooting in RF environments which can easily cause the serial port to lock
> up and you then need to remove and re-plug the serial port.

I have experienced this in other projects.  This is usually due to ingress via RF on cables.  Using good shielding, quality cables with ferrite chokes on both ends, and good grounding will often mitigate the problem.

> I'm not so sure
> that I'd want to use my NMEA GPS via a USB/Serial adaptor (Or even an FTDI
> USB GPS) if it were going to be hard wired into a mobile installation. In
> that environment (IMO and in the field experience) RS232 is the only way to
> go. 

Cables can be minimized or eliminated using certain form factors for the device,  another option is Bluetooth. (E.g. a bluetooth GPS or Audio device with a micro-adapter (no cable).

73 - John 

Re: Codec2

"John" <john@...>
 

If Codec-2 is ported to the UDR56K a user would have the option of using AMBE based DV (with the add-on card) and/or Codec-2.   Codec-2 has been making a lot of progress but isn't quite ready.  A framing and error-correction protocol is likely required and the current code uses floating point calculations which makes real time coding on difficult on this class of processor.  A move to fixed point and/or the use of a dedicated processor (like what is done with AMBE) should make it feasible.

The UDR56K AMBE card will likely carry the newer chip which supports more coding formats than what is needed for D-STAR, while remaining compatible with D-STAR.  Other AMBE based DV may be possible.


--- In UniversalDigitalRadio@..., Perry Chamberlain <canoeman@...> wrote:
>
> Although this is something that should have been done ten years ago, and is cool amateur radio engineering, the hundreds, and hundreds of thousands of dollars that has been spent on the AMBE CODEC EMBEDED equipment, is a massive barrier to this ever changing the Dstar system. And why yaesu, has decided to come out with yet another digital mode, is baffling.
> ( just a note, I own 6 yeasu radios, so I am a yaesu fan)
> But, thats what amateur radio is all about. But it would be nice if we could choose a common codec.
> I'm financially entrenched in Icom D-star now, so I'm locked in.
>
>
>
> Respectfully
>
> Perry Chamberlain
>
>
> On May 22, 2012, at 9:17 AM, "nikropht" nikropht@... wrote:
>
> > I wanted to let this group know about the progress on Codec2. Codec2 is a fully open source DV codec being developed as a replacement for AMBE2000 see http://www.codec2.org/ for details.
> >
> > -Mike
> > KD5QLN
> >
> >
>

Re: Codec2

"dnolder@..." <vk7yxx@...>
 

"this is something that should have been done ten years ago"

QFT

Unfortunately it wasn't, and that the biggest issue I have with the development of D-Star. Having said that, Amateur Radio is already a splintered hobby with many niches, so it's nothing new.

What concerns me more is the (political) resistance to allowing interoperability/gateways between systems. The transcoding, gateways and transports themselves are all relatively minor feats in comparison. All it takes is "someone" saying they won't allow gating from IRLP to Echolink, Echolink to D-Star, or P25 to whatever, and a segment becomes isolated. We're our own worst enemy and we'll pay for it in real dollars.

I don't want to have to take three HT with me when I leave the house, or have a rack of three mobile rigs in the car. I also don't want my investment in D-Star to become worthless.

The Icom/Yaesu situation is a classic. Can you imagine a CW/AM/SSB/FM transceiver that would only work with another transceiver of the same brand? That's effectively what we're talking about.

I really think hardware is the key. An extensible, fully open, software defined, HT, mobile and base with enough processing power on-board to handle whatever is required, even if it has to have an AMBE chip sitting to the side for backwards compatibility. Give the developers the platform and let them have at it.

Icom is the incumbent with the monopoly. Yeasu has played the FUD card with their "Digital Vision" document and the subsequent presentation of their solution at Dayton. We'll be the ones that pay if we play the game.

--- In UniversalDigitalRadio@..., Perry Chamberlain <canoeman@...> wrote:

Although this is something that should have been done ten years ago, and is cool amateur radio engineering, the hundreds, and hundreds of thousands of dollars that has been spent on the AMBE CODEC EMBEDED equipment, is a massive barrier to this ever changing the Dstar system. And why yaesu, has decided to come out with yet another digital mode, is baffling.
( just a note, I own 6 yeasu radios, so I am a yaesu fan)
But, thats what amateur radio is all about. But it would be nice if we could choose a common codec.
I'm financially entrenched in Icom D-star now, so I'm locked in.



Respectfully

Perry Chamberlain

Re: New file uploaded to UniversalDigitalRadio

"John" <john@...>
 

Hi Karen,

The UDR56K has been designed for high duty cycle at 25 watts, but not all tests for specifications have been performed. More data will be available in the future. If you look at the illustration, it has a substantial heat sink to dissipate heat. (Thermal calculations have been done -- testing remains.)

This is not a SDR radio, the de/modulation is performed within a high integration RF IC.

Electronic RX/TX switching very low settle time on frequency change or TX/RX switch. (Fast enough for frequency hopping.)

This is not a kit, it is a complete radio.

More specific specifications will be released in the future, including spectrum plots and other engineering measurements.

The buss from the computing board to transceiver mates the two eurocard boards.

Probably not at Friedrichafen this year -- our team will likely be "heads down" completing integration work through the summer to get the radio ready for the Q4 delivery goal.

--- In UniversalDigitalRadio@..., "Karen Tadevosyan, RA3APW" <ra3apw@...> wrote:

Hi John,

well, UDR56K - sounds good and promising.

Can I have few questions:

- RF TX power 25W is for 100% TX cycle? No degradation or switching to low RF power level?
- any additional cooling systems for 25W RF power and 100% cycle?
- what is RX/TX time (TX delay)? Electronic or mechanical RX/TX switching?
- RX: conventional or SDR (I/Q)?
- bandwidth of I/F filters for different speed (switching filters)? Type of filters?
- two points modulation (VCO + VC-TCXO)?
- RX multisignal selectivity?
- direct interface to TRX?
- availability of description of internal interfaces?
- kit availability?
- do you plan to demonstrate any concept of UDR56K in Friedrichafen, Germany in June 22-24?

Good luck with the UDR56K project!

Karen, RA3APW