Re: Any BPF 50 MHz design

g3zjo

开云体育

On 17/06/2013 23:28, Hans Summers wrote:

If someone builds a 6m design, 7-element LPF which will fit on the kit PCB, I am happy to stock them in the shop.

Done. That was very simple, I designed one some years ago and it is used on my Linear Mixer - Broadband Linear PA - VHF MEPT system, so I knocked up another.

I think it would be good if someone proves it works first ;-)

One free Ultimate2 kit (or other kits of equivalent value) to whoever proves the U2 works on 6m, and has reception reports to prove it!

:-) . What is the penalty for proving that the U2 does not work at 50MHz.?

I should have just measured before building an LPF but then none of us would have been fully happy. The U2 certainly radiates a signal on 50MHz but not via the antenna socket. The square wave drive from the DDS at 28MHz is rather marginal, at 50MHz it is a smear of very low amplitude, the Output FET just gets very hot.
In TX mode the output voltage across 50 Ohms is zero contrasted with the voltage in Standby prior to TX of 0.2V (400uW) at I assume 6.25MHz.

73 Eddie G3ZJO

Re: U2 Success

"Chris D"

#1383

Very happy with my latest WSPR spot this morning with the new U2 on 20m

2013-06-18 07:44 KQ2RP 14.097100 -22 FN20 0.2 VK4GC QG62mj  15421km

~kQ2RP

Show quoted text

--- In QRPLabs@..., Chris Del Plato KQ2RP <kq2rp.cw@...> wrote:

Hi all,

Happy to report that I built my U2 kit last week (aside from fully mounting
the display in the box, it is complete).  You can see my build here:

You can see in the photos that I used two small pieces of copper waveguide
thermal epoxied to the osc for heat sink.

I boxed it in this case, using this case:

which has slots which fit the U2 board nearly perfectly, except for two
issues: 1. the display contacts touch the case rail - fixed with some
teflon sheet insulation and contact cement, and 2. the turned around PA
transistors hit the side of the case and would not allow the board to slide
in. I asked a machinist at work to hog out a channel to allow the FETs to
clear.  This can likely be avoided if you know you wish to use this box
prior to building the kit and can add length to the FET leads and extend
their bodies a little further inward on the board.

I put it on the air in QRSS mode on Friday evening and saw my first grabbed
sigs and then switched to FSKCW to more easily see them:

Last night, I tried my first WSPRs (sans-GPS) and was excited to see many
spots:

Thanks to Hans (and beta testers) for putting out such a great value kit!
I can see I'm going to have lots of fun with it.  I've just placed an order
for each of the new chips and 30 & 40m filter kits to extend my playground.

72,
Chris
KQ2RP

Re: Picnic portables and GPS

"andyfoad@..."

#1382

Don't worry.

Your Tesco's own brand coffee secret is safe with me ;-))

73 de Andy (more a Carte Noir man myself)

Show quoted text

--- In QRPLabs@..., "Philip" <pcteee@...> wrote:

--- In QRPLabs@..., "andyfoad@" <andyfoad@> wrote:

Was just looking at "flanged potting boxes" instead of Nescafe lids
(copyright G4JVF) ;-)It wasn't Nescafe!

I could tell you what brand it was but then I would have to kill you ;))

Philip  G4JVF

Re: Picnic portables and GPS

"Philip"

#1381

--- In QRPLabs@..., "andyfoad@..." <andyfoad@...> wrote:

Was just looking at "flanged potting boxes" instead of Nescafe lids
(copyright G4JVF) ;-)It wasn't Nescafe!

I could tell you what brand it was but then I would have to kill you ;))

Philip  G4JVF

Re: v2.02k - Twice the fun, WSPR and QRSS together!

"m0xsd@..."

#1380

Mine too:)

Colin M0XSD.

Show quoted text

--- In QRPLabs@..., "Chris D" <kq2rp.cw@...> wrote:

Fantastic. Mine is on order!

Chris
KQ2RP

Picnic portables and GPS

"andyfoad@..."

#1379

Was just looking at "flanged potting boxes" instead of Nescafe lids
(copyright G4JVF) ;-)

[SEARCH EBAY)

These look like a reasonable way of affixing a protective top to a
box, in which the GPS is underneath. Some epoxy resin or similar
around the edges to stop water getting in.

I have nit seen any box with an all round flange though which would
be even better.

Anyone seen them ?

73 de Andy

Re: Any BPF 50 MHz design

Hans Summers

#1378

All

If someone builds a 6m design, 7-element LPF which will fit on the kit PCB, I am happy to stock them in the shop. I think it would be good if someone proves it works first ;-)

One free Ultimate2 kit (or other kits of equivalent value) to whoever proves the U2 works on 6m, and has reception reports to prove it!

73 Hans G0UPL

Show quoted text

On Mon, Jun 17, 2013 at 5:55 PM, Paul KE7HR <ke7hr@...> wrote:

?

I ran a fast 6 meter filter design from the AADE software and put the schematic and calculated plot in my Photos section KE7HR. This might be a starting point.

Paul KE7HR

--- In QRPLabs@..., "Paul KE7HR" wrote:
>
> There is FREE filter design software at:
>
>
> It also includes a calculator to determine which toroid to use and the number of turns to complete the design.
>
> I usually take what I get from AADE and work with it in the programs from the ARRL book "Expermintal Methods in RF Design" to make it just what I want, but the AADE design usually don't need much attention. I have used it to make filters from LF through low VHF.
>
> Paul KE7HR
>
> --- In QRPLabs@..., "T M" wrote:
> >
> > Hello
> >
> > I search a 50MHz LPF design seem than for U2
> >
> > Maybe you have this
> >
> > Thanks by advance
> >
> > Sincerely
> > Michel F5OZF
> >
>

Re: Any BPF 50 MHz design

"Paul KE7HR"

#1377

I ran a fast 6 meter filter design from the AADE software and put the schematic and calculated plot in my Photos section KE7HR.  This might be a starting point.

Paul KE7HR

Show quoted text

--- In QRPLabs@..., "Paul KE7HR" <ke7hr@...> wrote:

There is FREE filter design software at:

It also includes a calculator to determine which toroid to use and the number of turns to complete the design.

I usually take what I get from AADE and work with it in the programs from the ARRL book "Expermintal Methods in RF Design" to make it just what I want, but the AADE design usually don't need much attention.  I have used it to make filters from LF through low VHF.

Paul KE7HR

--- In QRPLabs@..., "T M" <f5ozf@> wrote:

Hello

I search a 50MHz LPF design seem than for U2

Maybe you have this

Thanks by advance

Sincerely
Michel F5OZF

Re: Any BPF 50 MHz design

"Paul KE7HR"

#1376

There is FREE filter design software at:

It also includes a calculator to determine which toroid to use and the number of turns to complete the design.

I usually take what I get from AADE and work with it in the programs from the ARRL book "Expermintal Methods in RF Design" to make it just what I want, but the AADE design usually don't need much attention.  I have used it to make filters from LF through low VHF.

Paul KE7HR

Show quoted text

--- In QRPLabs@..., "T M" <f5ozf@...> wrote:

Hello 

I search a 50MHz LPF design seem than for U2

Maybe you have this

Thanks by advance

Sincerely
Michel F5OZF

Re: v2.02k - Twice the fun, WSPR and QRSS together!

"Chris D"

#1375

Fantastic. Mine is on order!

Chris
KQ2RP

Arduino Shield 30m on

"Leigh L. Klotz, Jr WA5ZNU"

#1374

开云体育

My 30m MEPT "Multi-Mode Shield" kit from Hans G0UPL is on the air now from CM87.? I haven't had any success with W4HBK yet but VE7IGH is reliable at night.? I haven't measured or calibrated the output power yet, and I'm using short twisted pair to coax to a 25 ohm impedance SteppIR dipole up 12m with no additional matching, so it's seeing about 2:1.? I also haven't done anything about temperature stability, so it varies about 20Hz through the day.? Now it's at 10140+30Hz.
Leigh/WA5ZNU

Re: GPS antenna rain protection and "picnic portables".

"andyfoad@..."

#1373

--- In QRPLabs@..., "Philip" <pcteee@...> wrote:

Well spotted Andy, tis indeed a coffee jar lid  :)Hee hee ! (See, I do observe!)

Coffee jar lids once used here too.
My first Top Band AM set up many years ago was a KW160 transmitter plus Lafayette rx. Antenna switch over between the two was a
coffee jar lid and a 1 pole 3 way switch poked through the lid
and screwed to the shelf.

Good luck with your "picnic special"
Cheers !

73 de Andy

Re: GPS antenna rain protection and "picnic portables".

"Philip"

#1372

It's much the same idea as G4JVF's answer. I think he has a set of
photo's on this group. Phil's plastic top looks a bit like the lid
off a jar of coffee - Phil ? ;-))

Well spotted Andy, tis indeed a coffee jar lid  :)

Good luck with your "picnic special"


Philip  G4JVF

Re: Those GPS 1pps problems.

"Robert Bennett"

#1371

开云体育

Hello again Eddie

?

This might be a bit more useful!

?

And very simple to try.

?

73 Robert

Re: Those GPS 1pps problems.

g3zjo

#1370

开云体育

On 16/06/2013 16:38, Robert Bennett wrote:

Have a look at the circuit around the 1PPS for the PPS Piggie board here:

Thanks Robert interesting stuff.

I am sure Hans will crack it, if all else fails a special? v2.01 GPS parameters with v2.02 RF will be the final solution, because the Trimble was fine on v2.01.

73 Eddie

GPS antenna rain protection and "picnic portables".

"andyfoad@..."

#1369

By the way, I want to use my Ultimates as portable units.
Having a separate antenna makes it possible to put the transmitter
in a strong metal box, but nearly all the 'recommended' GPS units
appear to have integrated antennas which need delicate surgery to the
case and make waterproofing more difficult. Any thoughts on that?Dave,

I have another U2 here which I am also planning to use as a "picnic
portable" unit too ;-)

My current thoughts are that I am going to build the second UP501
module that I have into the same style enclosure as I have used for
my other U1 and U2's.

This would give me the space for:

* An 8 cell AA battery container. Dummy cells can also be used to
control the PA voltage. 2900ma Vapex NiMh cells are very cheap too.
?11 for 8 of them.




* 160m to 10m ATU built in like my others. Keeps everything self
contained.

* Cut a hole on the top of the enclosure to allow the UP501 (or
whatever your chosen GPS module is) to allow a clear RF view to be
seen by the GPS antenna. Now I have seen in the CPC catalogue
somewhere some nice little plastic units that could be glued or affixed over the module for waterproofing and physical protection.

I'm not sure what they call them, but I'll look them up tomorrow
in the works paper catalogue and post my suggestion on here.

It's much the same idea as G4JVF's answer. I think he has a set of
photo's on this group. Phil's plastic top looks a bit like the lid
off a jar of coffee - Phil ? ;-))

Just some thoughts...


73 de Andy

Re: Those GPS 1pps problems.

"Robert Bennett"

#1368

开云体育

Hello Eddie

?

Have a look at the circuit around the 1PPS for the PPS Piggie board here:

?

Scroll down towards bottom of page.

?

Maybe give some ideas?

?

Best regards and 73

?

Robert G3WKU

?

U2 Success

Chris Del Plato KQ2RP

#1367

Hi all,

Happy to report that I built my U2 kit last week (aside from fully mounting the display in the box, it is complete).? You can see my build here:

You can see in the photos that I used two small pieces of copper waveguide thermal epoxied to the osc for heat sink.?

I boxed it in this case, using this case:

which has slots which fit the U2 board nearly perfectly, except for two issues: 1. the display contacts touch the case rail - fixed with some teflon sheet insulation and contact cement, and 2. the turned around PA transistors hit the side of the case and would not allow the board to slide in. I asked a machinist at work to hog out a channel to allow the FETs to clear.? This can likely be avoided if you know you wish to use this box prior to building the kit and can add length to the FET leads and extend their bodies a little further inward on the board.

I put it on the air in QRSS mode on Friday evening and saw my first grabbed sigs and then switched to FSKCW to more easily see them:

Last night, I tried my first WSPRs (sans-GPS) and was excited to see many spots:

Thanks to Hans (and beta testers) for putting out such a great value kit!? I can see I'm going to have lots of fun with it.? I've just placed an order for each of the new chips and 30 & 40m filter kits to extend my playground.

72,

Chris

KQ2RP

Re: Those GPS 1pps problems. (Some bystander thoughts)

"g8voip"

#1366

Hi Guys,

Just in case anyone gets confused, there is no such thing as a Reyax UP501 GPS module!

Reyax are simply one of several Far Eastern sellers on ebay.

The GPS module being talked about was manufactured by Fastrax, since taken over by ublox (microblox). The UP501 is now an obsolete device now.

Looking at the spec should have worked ok with the U2 as I believe the 1 PPS was edge detected in the first release of software and there was the facility to choose positive rising or negative falling edges (or simply invert).

Operation with the U1 is far less certain as I recall there was a problem reported and Hans perhaps can confirm that the software uses 100mS as a cross over in the pulse window detector. The UP501 1 PPS signal according to the spec sheet is 100mS +/- a nats whisker so in theory might not work reliably.

73, Bob G8VOI

Show quoted text

--- In QRPLabs@..., dean smith <g7eob1@...> wrote:

I second FTD,s remarks on the reyax UP501 modules... Faultless.. Plug n
play ;-)
de Dean G7EOB
 On Jun 16, 2013 10:56 AM, "andyfoad@..." <
andyfoad@...> wrote:

**

--- In QRPLabs@..., g3zjo <g3zjo@> wrote:

Did the Rayax work on v2.01It's worked 100% on ALL versions, including all versions so far on
the U1 and the U2.

It just works....

73 de Andy

Re: 6.25MHz ?

"andyfoad@..."

#1365

Nice one Hans and all understood.

Good thinking !

73 de Andy

Show quoted text

--- In QRPLabs@..., Hans Summers <hans.summers@...> wrote:

Hi Andy

On key-up, the keying transistor Q1 is switched off, and the C1 capacitor
is also supposed to mop up any RF leakage too. However some RF *still* can
leak through to the antenna! It's many many dB down but if condx are good,
QRSS'ing can detect that stuff. Keith G6NHU sent me a beautiful screenshot
of slow-hell on the v2.02 and there was a faintly visible carrier between
words and between messages. Admittedly it was a very strong signal and only
just across the North Sea. But by moving the frequency to 6.25MHz during
key-up on Hell spaces or between Hell messages, I could eliminate that
faint key-up carrier. It was just a single function call and would fit into
the last few remaining bytes so I did it!

FYI 6.25MHz is what is used for the calibration of the 125MHz canned
oscillator when a GPS is connected, in the 13 seconds before the start of a
frame. 6.25MHz is 125MHz divided by 20. By measuring it for 10 seconds I am
able to determine the 125MHz frequency +/- 2 Hz, which is good enough.

73 Hans G0UPL



On Sun, Jun 16, 2013 at 11:39 AM, andyfoad@... <
andyfoad@...> wrote:

**


- In Hell modes, the frequency is now dropped to 6.25MHz during key-up >in a space character or between message transmissions

Not quite sure I understand that one Hans.

Do we Hell users have to apply for an NoV ? ;-)

73 de Andy

 