Date   

Bert Modderman PE1RKI

david656179
 

Has anybody reading had contact with Bert recently?  I placed an order before Christmas and paid by Paypal the amount Bert asked for.
I have had no confirmation that he has received payment etc.
Today, a mail I sent in December was bounced back to me some 5 weeks later saying unable to deliver.   I am worried that he is OK.  I know he is busy,  am happy to wait.  I have tried the Web Chat thingy (confess not to understand but I am logged in.
The contact mail I have been using is bert@...

Thanks for any help you can give.
David


Re: January SHF UKAC

Mike GD6ICR
 

I was over the moon - I was set up only for RCV on 13cm and tried to hear GM8IEM but tried on 3 different planes. Then GM4JTJ tuned his beam on me 52 no AS and 55 with AS. Awesome considering 31 ele beam 12M of LDF450 and Kuhne MKU 23. Today I tuned onto GB3CSB and best was -16 with no preamp. Now to ensure tx is sequenced and get myselfd a preamp and decent amplifier.

--
Mike GD6ICR IO74PF73TW


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Robin Szemeti - G1YFG
 

Yep, thanks, that's absolutely fine.

On Wed, 27 Jan 2021 at 17:09, Dave Cawley G4IUG <help@...> wrote:


No connector board,  just the PSU.

Some solder straight on, most use this one
https://www.ebay.co.uk/itm/Eltek-Flatpack-2HE-Power-Boards/193562474340

Dave  G4IUG









--
Robin Szemeti - G1YFG


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Dave Cawley G4IUG
 

No connector board,  just the PSU.

Some solder straight on, most use this one https://www.ebay.co.uk/itm/Eltek-Flatpack-2HE-Power-Boards/193562474340

Dave  G4IUG


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Paul Evans W4/VP9KF
 

Oooooo. I did go into CAN ages ago and the major application (8 million+ units) ended up being better served by OneWire sensors from Dallas Semi.
My design happened to use Microchip (PIC) in the power management part of the same system. Microchip are big time into uPs with lots of built-in CAN bus features as I'm sure you're aware. I can't give you lots of info except that they have continuously changed both their chip families and dev tools (which have become expensive even if you can promise large sales volumes). One of the major problems is that CAN bus now appears to be a moving target - I have a Davies CarChip which I bought in 2010 and worked great with our new Audi A3 TDI for 5+ years (before VAG bought back the vehicle!). However, the thing is hopeless on our 2017 BMW X1. Even worse with Stop/Start enabled. It goes bonkers.

I have since found out that around that time they stopped making the product - I suppose they had so many problems and returns and found it next to impossible to either support all the new vehicles OR re-engineer the product. Around 2015 they listed only one car on which they had found it wouldn't work.

Simple answer: Leave well alone. I'm sure there're much easier ways to do this!!!
--
73, Paul Evans G4BKI [VP9KF]


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Robin Szemeti - G1YFG
 

One final question .. do we need buy the connector board from the usual eBay suppliers, I was presuming I would need to buy it separately, but just checking before I do!

On Wed, 27 Jan 2021 at 16:40, Dave Cawley G4IUG <help@...> wrote:


OK some answers.  But please bear in mind my original philosophy was to supply ready to go and tested 48V PSU's and nothing else. 

The price is £72.00 plus £10.00 postage in England, Scotland and Wales.

I believe the range is 43.5-57.6V

I have quite a few !

 My setup is shown here and the data is attached

Please do not ask me any questions, although the group may know.  See my first sentence above again !

Regards

Dave G4IUG

 


--
Robin Szemeti - G1YFG


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Dave Cawley G4IUG
 


OK some answers.  But please bear in mind my original philosophy was to supply ready to go and tested 48V PSU's and nothing else. 

The price is £72.00 plus £10.00 postage in England, Scotland and Wales.

I believe the range is 43.5-57.6V

I have quite a few !

 My setup is shown here and the data is attached

Please do not ask me any questions, although the group may know.  See my first sentence above again !

Regards

Dave G4IUG

 


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Neil Smith G4DBN
 

There are PICs with CAN bus interfaces on-chip, like the PIC18F26K83 https://ww1.microchip.com/downloads/en/DeviceDoc/PIC18(L)F2526K83-Data-Sheet-DS40001943C.pdf

Some of the dsPIC33 family has CAN or ECAN on chip as well, for example the £2 SOIC-28 dsPIC33EP64GP502  https://www.mouser.co.uk/datasheet/2/268/70000657H-277982.pdf which is available in  MPLab Express cloud IDE unlike the newer dsPIC33EV64GM102 etc.

I'm migrating all of my masthead and remote station control stuff to CANbus, but I got a bit bogged down in the software abstraction layers on OpenCAN.

Some pushbike automatic gearchangers run CANbus, as I am informed by a bike-mad chum.

Neil G4DBN


On 27/01/2021 15:26, Andy G4JNT wrote:
Does anyone here know the CAN bus?   I read the spec a good few years ago and know the basics but have never used it, or ever had to.   Seems to have an interesting priority approach based on wired-OR to collision detection.
Wondering if a PIC based gizmo could be used to send adjustable voltage setting commands to this PSU - or if it's inadvisable.

Suppose I could make an interface and try reading from my car's diagnostic socket :-)



Re: Wideband 70cms racket

Gordon REASON <gordonj.reason@...>
 

satellite has moved on .......................

On 27 January 2021 at 15:24 Phil Williams <philwill73@...> wrote:

Well I am pleased to report in my case that wideband racket has gone, for now.
Phil 

On Wed, 27 Jan 2021 at 12:41, John Fell < john.g0api@...> wrote:
About 20 years ago , when the civil services introduced the still current digital comms system ,I was looking after GB3SZ , the UHF 1.6MHz split Repeater in central Bournemouth.
Being based on the usual Pye deck + Amateur band tweaks ,the RX squelch was hammered when the local Police started the new system from 150m LOS.

The late Nick Foot G4WHO and I had to spend considerable time adding cavity filtering and tweaking the system using R&S sig gens , comms Rxs and Spec Anns on top of a 10 storey office block.

We got our own back when some months later I was rung up by an officer from the RF investigations division in Bristol .He asked if I knew about an RF device sending "something one of our lot thinks is Morse " and after several mins thinks it sends GB3SC .

I was able to confirm being the Keeper and that it was a VHF Repeater .

He said they were getting occasional breakthrough on a newly installed multi-site repeater , which had a node 150m away .....

I referred him to Nick ,who just happened to be the Owner/MD of AQL EMC .

Nick had a chat and agreed to go to the Bournemouth site for  alook .

Turns out a contractor had gone through the Control Room and removed some cylindrical objects that had " nothing to do with the new system  " .i.e. they had dissed the antenna filtering components used to provide selective performance from out of band high level sources of RF .

As it turned out they had kept the items in a store room and Nick was able to refit - the complete multi-site system performance improved considerably and Nick picked up another Consultancy contract .

70cm is a shared Secondary allocation and has been for many years . I hope the current crop of QRM crap fails fast .

73
John
G0API

On Wed, 27 Jan 2021 at 11:54, Colin Ranson < g8lbs@...> wrote:

John,

 

On the input of IH its like ‘chuff........ chuff,chuff’    ‘chuff.........chuff,chuff’ on weak signals and  as you say, at various times, also very broadband.

 

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: G8ACE
Sent: 27 January 2021 11:21
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Wideband 70cms racket

 

There have been several different 70cm rackets in recent months.  Is this the one that sounds like 1pps marching on the spot.  It moves around and can occur on repeater inputs and outputs.  Its audible  at various times on all the 70cm repeaters I can receive .  It starts up and goes away without warning and seems very hard to get a bearing on.  I suspect its multiple sources and we are likely stuck with it from now on as I guess its almost certainly a licence free qrm machine.
73s John G8ACE

 

 

 

 

 

 


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Mike Willis
 

E.g. this thread has some useful info http://www.thebackshed.com/forum/ViewTopic.php?FID=4&TID=12035

Here is some code as an example,

#include <mcp_can.h>
#include <mcp_can_dfs.h>
 
#include <SPI.h>
 
unsigned char login[8] = {0x16, 0x36, 0x71, 0x07, 0x03, 0x76, 0x00, 0x00}; //this is for logging into your flatpack. Must use your serial number.
 
const int SPI_CS_PIN = 10;
MCP_CAN CAN(SPI_CS_PIN); // Set CS pin
 
#define VOLTAGE 4800
#define CURRENT 0100
 
uint8_t outset[8] = {CURRENT & 0xff, (CURRENT >> 8) & 0xff, VOLTAGE & 0xFF, (VOLTAGE >> 8) & 0xFF ,VOLTAGE & 0xFF, (VOLTAGE >> 8) & 0xFF ,0x3E, 0x17};
 
void setup()
{
   Serial.begin(115200);
   pinMode(3,INPUT);
START_INIT:
   if(CAN_OK == CAN.begin(MCP_ANY, CAN_125KBPS, MCP_8MHZ))
   {
       Serial.println("CAN BUS Shield init ok!");
   }
else
   {
   Serial.println("CAN BUS Shield init fail");
   Serial.println("Init CAN BUS Shield again");
   delay(100);
   goto START_INIT;
   }
CAN.setMode(0);    
delay(200);
CAN.sendMsgBuf(0x05004804, 1, 8, login);    // id = 1 so XX = 04    
}
 
 
void loop() {
   unsigned char len = 0;
   unsigned char buf[8] ;
   int c=0;
   if(CAN_MSGAVAIL == CAN.checkReceive())
   {
       
       CAN.readMsgBuf(&len, buf);
         uint32_t canId = CAN.getCanId();
         Serial.print("0");
         Serial.print(canId,HEX);
         Serial.print("\t");
       for(int i = 0; i<len; i++)
       {
           if( buf[i] < 0x10){ Serial.print("0");} Serial.print(buf[i],HEX);
           Serial.print(" ");
       }
       Serial.println();
      Serial.print("Temperature = ");
      Serial.println(buf[0]);
      Serial.print("Current = ");
      Serial.println(buf[2]*255*0.1+buf[1]*0.1);
      Serial.print("OutputVoltage = ");
      Serial.println(buf[4]*255*0.01+buf[3]*0.01);
      Serial.print("OutputPower = ");
      Serial.println((buf[4]*255*0.01+buf[3]*0.01)*(buf[2]*255*0.1+buf[1]*0.1));
      Serial.print("InputVoltage = ");
      Serial.println(buf[5]);
     
      //send request for new update
      CAN.sendMsgBuf(0x05004804, 1, 8, login);     // XX = 04
     
   
     }
}
--
Mike G0MJW


Re: ADF4351 Output power

militaryoperator
 

On my boards Geoff the o/p go through a 1nf then there's a 3.9nh up to a 3v rail from the chip pin. 

I have the little boards with the small screen and 5 buttons on them. 

Ben G4BXD


Subject: [UKMicrowaves] ADF4351 Output power

Last night i discovered that all of my ADF4351 boards have their outputs returned to supply volts via a 50R resistor, i suppose to make one size fit all needs and if you want you can change it.
Not having anything other than a 47nH 0603 inductor i tried this instead of the 50R resistor and well :-
with 50R
106.5 MHz = 1.25 mW
432 MHz = 1.35 mW
1242 MHz= 1.30 mW
2500 MHz= 4.0 mW

with 47nH
106.5 MHz = 3.6 mW
432 MHz= 4.6 mW
1242 MHz=3.8 mW
2500 MHz =4.1 mW

This achieved a 4.6 dB increase where i wanted it at 1242 MHz, no doubt a balun would give even more but the single resistor change was a quicky just to see, not sure if the above table is going to come out correctly
cheers
Geoff
GI0GDP


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Mike Willis
 

Hi Andy

That's what I did with an Arduino and a CAN bus adapter. Easy with all the libraries.

E.g. google MCP2515 CAN Bus Module


--
Mike G0MJW


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

g4cch_1
 

Thanks Dave,
What's the upper and lower limit for voltage?

Howard, g4cch


ADF4351 Output power

geoffrey pike
 

Last night i discovered that all of my ADF4351 boards have their outputs returned to supply volts via a 50R resistor, i suppose to make one size fit all needs and if you want you can change it.
Not having anything other than a 47nH 0603 inductor i tried this instead of the 50R resistor and well :-
with 50R
106.5 MHz = 1.25 mW
432 MHz = 1.35 mW
1242 MHz= 1.30 mW
2500 MHz= 4.0 mW

with 47nH
106.5 MHz = 3.6 mW
432 MHz= 4.6 mW
1242 MHz=3.8 mW
2500 MHz =4.1 mW

This achieved a 4.6 dB increase where i wanted it at 1242 MHz, no doubt a balun would give even more but the single resistor change was a quicky just to see, not sure if the above table is going to come out correctly
cheers
Geoff
GI0GDP


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Andy G4JNT
 

Does anyone here know the CAN bus?   I read the spec a good few years ago and know the basics but have never used it, or ever had to.   Seems to have an interesting priority approach based on wired-OR to collision detection.
Wondering if a PIC based gizmo could be used to send adjustable voltage setting commands to this PSU - or if it's inadvisable.

Suppose I could make an interface and try reading from my car's diagnostic socket :-)



On Wed, 27 Jan 2021 at 13:08, Dave Cawley G4IUG <help@...> wrote:


I believe I have replied to everyone who asked, if not let me know.  The price is £72.00 set to your voltage and load/soak tested, plus £10.00 for second class signed for post.  England, Scotland, Wales and Northern Ireland only.

73  Dave  G4IUG  Ex G8EAO



Re: Wideband 70cms racket

Phil Williams
 

Well I am pleased to report in my case that wideband racket has gone, for now.
Phil 

On Wed, 27 Jan 2021 at 12:41, John Fell <john.g0api@...> wrote:
About 20 years ago , when the civil services introduced the still current digital comms system ,I was looking after GB3SZ , the UHF 1.6MHz split Repeater in central Bournemouth.
Being based on the usual Pye deck + Amateur band tweaks ,the RX squelch was hammered when the local Police started the new system from 150m LOS.

The late Nick Foot G4WHO and I had to spend considerable time adding cavity filtering and tweaking the system using R&S sig gens , comms Rxs and Spec Anns on top of a 10 storey office block.

We got our own back when some months later I was rung up by an officer from the RF investigations division in Bristol .He asked if I knew about an RF device sending "something one of our lot thinks is Morse " and after several mins thinks it sends GB3SC .

I was able to confirm being the Keeper and that it was a VHF Repeater .

He said they were getting occasional breakthrough on a newly installed multi-site repeater , which had a node 150m away .....

I referred him to Nick ,who just happened to be the Owner/MD of AQL EMC .

Nick had a chat and agreed to go to the Bournemouth site for  alook .

Turns out a contractor had gone through the Control Room and removed some cylindrical objects that had " nothing to do with the new system  " .i.e. they had dissed the antenna filtering components used to provide selective performance from out of band high level sources of RF .

As it turned out they had kept the items in a store room and Nick was able to refit - the complete multi-site system performance improved considerably and Nick picked up another Consultancy contract .

70cm is a shared Secondary allocation and has been for many years . I hope the current crop of QRM crap fails fast .

73
John
G0API

On Wed, 27 Jan 2021 at 11:54, Colin Ranson <g8lbs@...> wrote:

John,

 

On the input of IH its like ‘chuff........ chuff,chuff’    ‘chuff.........chuff,chuff’ on weak signals and  as you say, at various times, also very broadband.

 

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: G8ACE
Sent: 27 January 2021 11:21
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Wideband 70cms racket

 

There have been several different 70cm rackets in recent months.  Is this the one that sounds like 1pps marching on the spot.  It moves around and can occur on repeater inputs and outputs.  Its audible  at various times on all the 70cm repeaters I can receive .  It starts up and goes away without warning and seems very hard to get a bearing on.  I suspect its multiple sources and we are likely stuck with it from now on as I guess its almost certainly a licence free qrm machine.
73s John G8ACE

 


round attenuator dissasembly?

militaryoperator
 

Does anyone know how to take apart a round attenuator? I have a Weinschel 50W one faulty.

Thought I'd try and look inside. 

Looks like the fins screw off the body?

Ben.


Re: Eltek Flatpack2 PSU 3KW set to 48V or whatever you want.

Dave Cawley G4IUG
 


I believe I have replied to everyone who asked, if not let me know.  The price is £72.00 set to your voltage and load/soak tested, plus £10.00 for second class signed for post.  England, Scotland, Wales and Northern Ireland only.

73  Dave  G4IUG  Ex G8EAO



Re: Wideband 70cms racket

John Fell
 

About 20 years ago , when the civil services introduced the still current digital comms system ,I was looking after GB3SZ , the UHF 1.6MHz split Repeater in central Bournemouth.
Being based on the usual Pye deck + Amateur band tweaks ,the RX squelch was hammered when the local Police started the new system from 150m LOS.

The late Nick Foot G4WHO and I had to spend considerable time adding cavity filtering and tweaking the system using R&S sig gens , comms Rxs and Spec Anns on top of a 10 storey office block.

We got our own back when some months later I was rung up by an officer from the RF investigations division in Bristol .He asked if I knew about an RF device sending "something one of our lot thinks is Morse " and after several mins thinks it sends GB3SC .

I was able to confirm being the Keeper and that it was a VHF Repeater .

He said they were getting occasional breakthrough on a newly installed multi-site repeater , which had a node 150m away .....

I referred him to Nick ,who just happened to be the Owner/MD of AQL EMC .

Nick had a chat and agreed to go to the Bournemouth site for  alook .

Turns out a contractor had gone through the Control Room and removed some cylindrical objects that had " nothing to do with the new system  " .i.e. they had dissed the antenna filtering components used to provide selective performance from out of band high level sources of RF .

As it turned out they had kept the items in a store room and Nick was able to refit - the complete multi-site system performance improved considerably and Nick picked up another Consultancy contract .

70cm is a shared Secondary allocation and has been for many years . I hope the current crop of QRM crap fails fast .

73
John
G0API

On Wed, 27 Jan 2021 at 11:54, Colin Ranson <g8lbs@...> wrote:

John,

 

On the input of IH its like ‘chuff........ chuff,chuff’    ‘chuff.........chuff,chuff’ on weak signals and  as you say, at various times, also very broadband.

 

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: G8ACE
Sent: 27 January 2021 11:21
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Wideband 70cms racket

 

There have been several different 70cm rackets in recent months.  Is this the one that sounds like 1pps marching on the spot.  It moves around and can occur on repeater inputs and outputs.  Its audible  at various times on all the 70cm repeaters I can receive .  It starts up and goes away without warning and seems very hard to get a bearing on.  I suspect its multiple sources and we are likely stuck with it from now on as I guess its almost certainly a licence free qrm machine.
73s John G8ACE

 


Re: Wideband 70cms racket

Mike Willis
 

It could be anything from an important military application for the primary user to a weather station. Remote controlled construction equipment caused this problem to GB3DI a few years back. s secondary users, we don't really have a right to complain about interference from primary users, but we can at least request other secondary users coordinate. 
--
Mike G0MJW

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