Date   

Re: Splash plate feed

VA3ELE Peter
 

Hi all,

Since you're all talking about reflector surfaces for a cassegrain type feed. I've been looking for different types of reflectors as well. Althought this idea is not as cheap as a used can bottom from an aresol can, here's another thought, a concave mirror back or a convex front can be used by covering with aluminum tape  (if the surface is not RF reflective). I'll be experimenting with mine over the next little bit of time. Once I come up with a sufficient mounting system allowing for focal adjustment on my 12" dish, I'm hoping to put it into practice this winter using the 21dBi horn.

73 de Peter
VA3ELE FN03dm 


Re: Splash plate feed

Mats Espling
 

Hi Paul;

 

Thanks for making me aware of the email.

I apologize to everyone for the email as it seems to be a “pocket email” from my mobile and not from hacking. I’ve noticed this problem before and it seem to happen after the mobile get “active” in the pocket after an incoming email.

 

73’

/Mats, SM6EAN

 

Från: The122GProject@groups.io <The122GProject@groups.io> För Paul AA6PZ
Skickat: den 25 september 2021 20:34
Till: The122GProject@groups.io; mats.espling@...
Ämne: Re: [The122GProject] Splash plate feed

 

Mats:

 

Was your email hacked? I got a suspicious message that only had a cryptic URL. 

 

Often those emails are generated by some malware that has gotten into someones account.

 

 

 

To everyone else:

 

When I want to share a URL, I always add a sentence or two telling the recipients why it might be of interest. Easy for a human, not so easy for a bot.

 

On Saturday, September 25, 2021, 10:07:13 AM PDT, Mats Espling <mats.espling@...> wrote:

 

 

<url deleted>


Re: Splash plate feed

Paul AA6PZ
 

Mats:

Was your email hacked? I got a suspicious message that only had a cryptic URL. 

Often those emails are generated by some malware that has gotten into someones account.



To everyone else:

When I want to share a URL, I always add a sentence or two telling the recipients why it might be of interest. Easy for a human, not so easy for a bot.

On Saturday, September 25, 2021, 10:07:13 AM PDT, Mats Espling <mats.espling@...> wrote:


<url deleted>


Re: Splash plate feed

Mats Espling
 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Iain Crawford <iain@...>
Sent: Thursday, September 23, 2021 12:53:12 PM
To: the122gproject@groups.io <the122gproject@groups.io>
Subject: Re: [The122GProject] Splash plate feed
 
The F/D for that dish is about 0.25. You could try to illuminate the dish with the bare chip.
Iain
VK5ZD


On 23 Sep 2021, at 19:42, Noel - G8GTZ <noel@...> wrote:
A couple of us are looking to improve on our 17km QSO which we did a year ago and have bought 18" optical reflectors from Edmund optics - they had a 20% offer in the summer and it seemed a good idea at the time! https://www.edmundoptics.co.uk/p/18quot-diameter-parabolic-reflector/26252/

We are now looking to improvise a feed!   We have bought some 4mm OD, 2mm ID brass tubing which is a slide fit into the Chaparral feed antenna mount and thinking to use a sliding splash plate on the end of that - it may not illuminate the whole dish but should give some useful improvements.

Be interested in any comments (apart from I wouldn't do that!) and ideas particularly for the dimensions of the splash plate or alternatives that can be knocked up on the kitchen table - no fancy mechanical workshop here!

73's
Noel - G8GTZ


Re: Splash plate feed

G8ACE
 

Far from correct but you could try the bottom of a camping gaz can as the cassegrain reflector.
On 47GHz I used open ended 4mm bore tube waveguide and the gaz can bottom with a 50cm dish.
Fortunately the dish already had a support spider.
It focusses nicely, much better than flat splash plates with the waveguide a logical distance from the cassegrain
something I never found with flat reflectors.
Gain at 47GHz with this measured over 30m is +4db on a 30cm Pasolink dish with its 49GHz horn.
Its possible a smaller aerosol can base might be better at 122 GHz.
Something to try.
I got nowhere trying to find out the curvature of the base of various cans so its suck it and see.

Picking the right weather is likely to give bigger signals than changing the antenna I fear.  Results from elsewhere in the world seem to be rather better than in moist UK.

73s John G8ACE


Re: Splash plate feed

Neil Smith G4DBN
 

Hands up here, I've rather dropped the ball on this one (along with a lot of other projects) as a result of Caroline's illness and death. I'm struggling to cope with grieving and with life in general at the moment. I'm also working full time at the day job for a while, so my radio/machining time is extremely constrained.

I will get back to making the Cassegrain subreflectors and custom horns and mounts for those Edmund dishes soon. My intention is still to use one as an example in my RSGB Convention lecture in October, but time is running out fast. I have some 18 inch and 12 inch Edmund dishes here to try.  No promises though, I still have several long-outstanding orders for 122 antennas to complete.

It would be interesting to compare a splashplate with a Cassegrain and perhaps even a dielguide lens on those extremely deep dishes.  One thing to consider is that there is an automatic 6dB edge taper on an f/d 0.25 parabola, simply as a result of space attenuation. The edge of the dish is twice as far from the feedpoint as compared with the centre of the dish.  As a result, the angle of the feed needs to be wider than you would expect, with only 5-6 dB edge taper to achieve the optimal 12 dB or so effective edge taper.

Neil G4DBN

On 23/09/2021 11:14, Noel - G8GTZ wrote:
A couple of us are looking to improve on our 17km QSO which we did a year ago and have bought 18" optical reflectors from Edmund optics - they had a 20% offer in the summer and it seemed a good idea at the time! https://www.edmundoptics.co.uk/p/18quot-diameter-parabolic-reflector/26252/ <https://www.edmundoptics.co.uk/p/18quot-diameter-parabolic-reflector/26252/>

We are now looking to improvise a feed!   We have bought some 4mm OD, 2mm ID brass tubing which is a slide fit into the Chaparral feed antenna mount and thinking to use a sliding splash plate on the end of that - it may not illuminate the whole dish but should give some useful improvements.

Be interested in any comments (apart from I wouldn't do that!) and ideas particularly for the dimensions of the splash plate or alternatives that can be knocked up on the kitchen table - no fancy mechanical workshop here!


Re: Splash plate feed

Iain Crawford
 

The F/D for that dish is about 0.25. You could try to illuminate the dish with the bare chip.
Iain
VK5ZD


On 23 Sep 2021, at 19:42, Noel - G8GTZ <noel@...> wrote:
A couple of us are looking to improve on our 17km QSO which we did a year ago and have bought 18" optical reflectors from Edmund optics - they had a 20% offer in the summer and it seemed a good idea at the time! https://www.edmundoptics.co.uk/p/18quot-diameter-parabolic-reflector/26252/

We are now looking to improvise a feed!   We have bought some 4mm OD, 2mm ID brass tubing which is a slide fit into the Chaparral feed antenna mount and thinking to use a sliding splash plate on the end of that - it may not illuminate the whole dish but should give some useful improvements.

Be interested in any comments (apart from I wouldn't do that!) and ideas particularly for the dimensions of the splash plate or alternatives that can be knocked up on the kitchen table - no fancy mechanical workshop here!

73's
Noel - G8GTZ


Splash plate feed

Noel - G8GTZ
 

A couple of us are looking to improve on our 17km QSO which we did a year ago and have bought 18" optical reflectors from Edmund optics - they had a 20% offer in the summer and it seemed a good idea at the time! https://www.edmundoptics.co.uk/p/18quot-diameter-parabolic-reflector/26252/

We are now looking to improvise a feed!   We have bought some 4mm OD, 2mm ID brass tubing which is a slide fit into the Chaparral feed antenna mount and thinking to use a sliding splash plate on the end of that - it may not illuminate the whole dish but should give some useful improvements.

Be interested in any comments (apart from I wouldn't do that!) and ideas particularly for the dimensions of the splash plate or alternatives that can be knocked up on the kitchen table - no fancy mechanical workshop here!

73's
Noel - G8GTZ


Re: Second batch module problem .

Paul AA6PZ
 

There is a material called ChipQuik that is fantastic for removing parts. 

It looks like solder but is a metal alloy with a very low melting point.  You use a solder iron to apply it to the pins of the part you want to remove.  Because of the low melting point, you can get the solder on all of the pins to melt at the same time at a temperature that will not damage either the board or the part. 

BTW, their solder flux is one of the better fluxes on the market.

On Saturday, September 18, 2021, 08:55:44 AM PDT, cricri <f1vl@...> wrote:


Hi Don ,


Le 18/09/2021 à 17:26, Don Woodward a écrit :
Nice job.

Did you use a hot air gun to remove and replace it?


No , a cutter to cut the pin very close to the PIC

And a soldering iron with a fine tip to remove the pin and solder the new PIC after .

I had to change an ADF4351 some weeks ago and then used the hot air gun ... But I don't like this tool ...


73's

Xtian / F1VL



73’s 

Don W
KD4APP 

From: The122GProject@groups.io <The122GProject@groups.io> on behalf of cricri via groups.io <f1vl@...>
Sent: Saturday, September 18, 2021 10:47:01 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] Second batch module problem .
 
Hi all ,
received a new PIC
replace, programm and now :
All is perfect !

So : problem solved !

Best 73
Xtian / F1VL



Re: order

Tim - VK2XAX
 

Hi Xtian,

Please see direct email today.

Apologies to all for my tardy replies, a lot going on here at the moment.

cheers

Tim


--
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA


Re: Second batch module problem .

cricri
 

Hi Don ,


Le 18/09/2021 à 17:26, Don Woodward a écrit :
Nice job.

Did you use a hot air gun to remove and replace it?


No , a cutter to cut the pin very close to the PIC

And a soldering iron with a fine tip to remove the pin and solder the new PIC after .

I had to change an ADF4351 some weeks ago and then used the hot air gun ... But I don't like this tool ...


73's

Xtian / F1VL



73’s 

Don W
KD4APP 

From: The122GProject@groups.io <The122GProject@groups.io> on behalf of cricri via groups.io <f1vl@...>
Sent: Saturday, September 18, 2021 10:47:01 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] Second batch module problem .
 
Hi all ,
received a new PIC
replace, programm and now :
All is perfect !

So : problem solved !

Best 73
Xtian / F1VL



Re: Second batch module problem .

Don Woodward
 

Nice job.

Did you use a hot air gun to remove and replace it?

73’s 

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of cricri via groups.io <f1vl@...>
Sent: Saturday, September 18, 2021 10:47:01 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] Second batch module problem .
 
Hi all ,
received a new PIC
replace, programm and now :
All is perfect !

So : problem solved !

Best 73
Xtian / F1VL


Re: Second batch module problem .

cricri
 

Hi all ,
received a new PIC
replace, programm and now :
All is perfect !

So : problem solved !

Best 73
Xtian / F1VL


order

cricri
 

Hi all and particularly Tim ,

A French Om need to begin on the 122 GHz Band .

So he need :

- a Batch 2 board completed 
- a 20dB horn
- a 10dB horn

So please may you send an invoice to him ?

Patrick F4HSP

f4hsp@...

I apologize to everyone for this request, but he had no answer from direct mail


Best 73

Xtian / F1VL



Re: Update #21 nearly all kits arrived

Göran Björk SM0IKR
 

Package to Sweden in my good hands now. Thanks a lot.
73 George


Re: Update #21 nearly all kits arrived

Gennaro Perrone
 

Package arrived today thank you.

73’ IK0EQJ
Gennaro Perrone
Roma (Italy)


Il giorno 19 ago 2021, alle ore 02:04, Bob Lockley VK6KW <rlockley@...> ha scritto:

Thanks Tim and XYL,
Mine arrived 17th safe and sound.
Best 73,
Bob.
 
From: The122GProject@groups.io <The122GProject@groups.io> On Behalf Of Tim - VK2XAX
Sent: Monday, August 16, 2021 12:17 PM
To: The122GProject@groups.io
Subject: [The122GProject] Update #21 nearly all kits shipped
 

Hi all,

The second shipment has just been picked up by Australia Post.

All group packages have now been shipped. If you are in a group, check with your coordinator for your package's arrival.

International shipments from the 1st shipment should be arriving at your QTH soon, some already have.

Keep your eye on your email for tracking notifications from Australia Post

I have 4 packages left for individuals who I am chasing up.

regards

Tim

<image001.png>

-- 
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA
 


Re: VK3CV 122 board status display

john pryke
 

Hi Mark
Bit late to the party, but if still available I would like to order a populated smd display board please.
Many thanks 
John G8BXH

On Sun, 12 Sep 2021, 16:12 André F1PYR via groups.io, <andre_f1pyr=yahoo.fr@groups.io> wrote:
Hello Mark

I just noticed, I have ordered 2 populated boards, does it still possible to get them ?

Display PCB SMD populated GBP 8.00

Display bezel 120 x 95mm GBP6.00

73 Andre
F1PYR


Le samedi 13 mars 2021 à 14:54:30 UTC+1, André F1PYR <andre_f1pyr@...> a écrit :


Hi Mark

please add 2 populated boards for me ,
Many thanks

73 André  F1PYR




Re: VK3CV 122 board status display

André F1PYR
 

Hello Mark

I just noticed, I have ordered 2 populated boards, does it still possible to get them ?

Display PCB SMD populated GBP 8.00

Display bezel 120 x 95mm GBP6.00

73 Andre
F1PYR


Le samedi 13 mars 2021 à 14:54:30 UTC+1, André F1PYR <andre_f1pyr@...> a écrit :


Hi Mark

please add 2 populated boards for me ,
Many thanks

73 André  F1PYR




Re: Second batch module problem .

cricri
 

Hi Mike,
thanks for answer ,

Le 11/09/2021 à 21:34, Mike Lavelle K6ML a écrit :
Assuming you mean pin 9 on the PIC...
Yes !

It should change when the hex channel switch is changed from even to odd settings.
It works perfectly !

If not, look for a weak short on that trace
not found
or a bad switch
it is OK
or bad PIC.
Win !! 😁😁

After reprogramming with old or new soft all works perfectly even the A/B function .

ordered a new PIC and I am quite sure all will be perfect after replacement ! 😁

Thanks all,


Xtian / F1VL




On 09/11/2021 8:58 AM cricri <f1vl@orange.fr> wrote:

Hi all ,

Tried to ask Tim but no answer from him .. may be a spam problem ...

So I explain :

On this new module the pin 9 is always at 0 level ..

There is no modification on the module , no A/B , TX or Key switch connected , only + and - power supply connected .

Since I found this problem I connected the RS 232 lines and can read and program things on the module . So the software
seems working well .

** 122G_003 VK3CV / WQ1S **
 VERSION # 122G_003_20F3006
 BEACON =  F1VL CQ F1VL CQ F1VL CQ
 BEACON CARRIER DELAY = 20
 CHANNEL E DATA = 10 72 01 17 DD 88 10 72 01 17 E3 2C

 ER  TU  REFV EC VCOV DCIN

I reprogrammed the module with last version ( same as on delivery ) .

And the problem is still there ..

If I connect TX to ground the del goes RED

If I connect Key to ground the DEL goes RED

If I measure with the Ohmmeter between Pin 9 and ground there is ~ 2 K Ohm , on the other pin 10 ; 11 and 14  to ground
there is more than 200 K Ohm

So ?????

I think the PIC is dead ( only PIN 9 !! ) or the channel selection switch ??? But 2 K Ohms for a switch ???

Any idea or help ??

NB : I use two modules from first batch with any problem and did many QSO with them ....

Best 73

Xtian / F1VL







Re: Second batch module problem .

cricri
 

Hi All,

Le 12/09/2021 à 00:14, Thomas S. Knutsen a écrit :
If you are able, try to load the PIC again with the program,

Thanks Thomas , done with no better results ...


I am quite sure the PIC is dead .. ordered one ... must wait ...


Best 73

Xtian / F1VL


I have experienced that some times, when boards go through x-ray machines while in shipping, they can lose their program, old PIC16 series had some versions that was horrible, you had to bring it as hand luggage and ask them to not x-ray it, or you would have to load the board again. 


73 de Thomas LA3PNA.

lør. 11. sep. 2021 kl. 21:43 skrev Don Woodward <dbwoodw@...>:
Maybe try shorting your beacon string ?  I count 23 on yours - 24 is max 

73

Don W
KD4APP 
 

From: The122GProject@groups.io <The122GProject@groups.io> on behalf of cricri via groups.io <f1vl=orange.fr@groups.io>
Sent: Saturday, September 11, 2021 2:58:04 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] Second batch module problem .
 
Le 11/09/2021 à 19:29, Don Woodward a écrit :
Thanks I remember now it is optional.

He should still see a red then green LED and the 10Mhz output.

Yes I see : Red , a red flash and green !

Goes red if Tx is grounded

Goes red if Key is grounded

I can send CW with Key

BUT when TX and Key are grounded LED goes red but no CW beacon , after a while the LED switch off and after an another while goes green ...

Very strange behaviour ..

May be there is not only pin 9 problem  in the PIC ???

Ordered PIC  .....


73's

Xtian / F1VL



73’s

Don W
KD4APP 

From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Rus Healy, K2UA via groups.io <Rus.healy@...>
Sent: Saturday, September 11, 2021 12:45:23 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] Second batch module problem .
 
Don,

I’m not using the 1 PPS input. No issues. 

—73, Rus, K2UA

On Sat, Sep 11, 2021 at 12:32 PM Don Woodward <dbwoodw@...> wrote:
Do you have a 1PPS connected?  I think you need that.  Does the LED go green or does it stay Red?  It should go green with 1PPS connected and then you should have a 10Mhz signal present on the 10Mhz ports.

73’s

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of cricri via groups.io <f1vl=orange.fr@groups.io>
Sent: Saturday, September 11, 2021 11:58:30 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: [The122GProject] Second batch module problem .
 
Hi all ,

Tried to ask Tim but no answer from him .. may be a spam problem ...

So I explain :

On this new module the pin 9 is always at 0 level ..

There is no modification on the module , no A/B , TX or Key switch connected , only + and - power supply connected .

Since I found this problem I connected the RS 232 lines and can read and program things on the module . So the software
seems working well .

** 122G_003 VK3CV / WQ1S **
  VERSION # 122G_003_20F3006
  BEACON =  F1VL CQ F1VL CQ F1VL CQ
  BEACON CARRIER DELAY = 20
  CHANNEL E DATA = 10 72 01 17 DD 88 10 72 01 17 E3 2C

  ER  TU  REFV EC VCOV DCIN

I reprogrammed the module with last version ( same as on delivery ) .

And the problem is still there ..

If I connect TX to ground the del goes RED

If I connect Key to ground the DEL goes RED

If I measure with the Ohmmeter between Pin 9 and ground there is ~ 2 K Ohm , on the other pin 10 ; 11 and 14  to ground
there is more than 200 K Ohm

So ?????

I think the PIC is dead ( only PIN 9 !! ) or the channel selection switch ??? But 2 K Ohms for a switch ???

Any idea or help ??

NB : I use two modules from first batch with any problem and did many QSO with them ....

Best 73

Xtian / F1VL











--
With Best regards, Thomas S. Knutsen.

 Please  avoid sending  me  Word  or  PowerPoint  attachments.


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