Date   

Re: GB3PKT 10 Ghz Beacon

militaryoperator
 


Will be on 3Cm this evening. 

KST for start. 

Ben G4BXD IO82UJ


Re: GB3PKT 10 Ghz Beacon

John Lemay
 

David

 

Yes, it’s QRV and seems the usual strength here.

 

Maybe just due to conditions …….

 

John G4ZTR

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of david656179 via groups.io
Sent: 23 March 2021 16:57
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] GB3PKT 10 Ghz Beacon

 

Can somebody confirm that GB3PKT is on air please.  It is always a good signal here in JO02, albeit scattered at times.

Thanks


GB3PKT 10 Ghz Beacon

david656179
 

Can somebody confirm that GB3PKT is on air please.  It is always a good signal here in JO02, albeit scattered at times.

Thanks



Re: DB6NT sequencer

Robin Szemeti - G1YFG
 

Daft question ... have you got a back EMF diode on the relay coil?  You need something to catch the pulse when FET opens and the coil current collapses.  You could try slowing the gate rase/fall times to limit the di/dt in the coil.

On Tue, 23 Mar 2021 at 10:20, Graham - G3YJR <g3yjr@...> wrote:
I wonder if you might have done this?: I put an indicator LED/resistor across the switching FET to indicate the state and I was surprised to find that the indicator LED passed just enough current to hold the relay on. A higher resistance and a lower-drain/brighter LED solved the problem.

73 Graham


--
Robin Szemeti - G1YFG


30THz experiments ...video

G3PHO - Peter
 

Barry, G8AGN, asked me to collate his video clips of his except experiments on 30THz. You can find them on You Tube at this link:


https://youtu.be/jZ_lQgRyC5c

Any one for “heatwaves” ?  :-)

Peter G3PHO


Re: DB6NT sequencer

Graham - G3YJR
 

I wonder if you might have done this?: I put an indicator LED/resistor across the switching FET to indicate the state and I was surprised to find that the indicator LED passed just enough current to hold the relay on. A higher resistance and a lower-drain/brighter LED solved the problem.

73 Graham


Re: Wavelab 2W 24Ghz TRV

Robin Szemeti - G1YFG
 

Very nice! ...

One thought, the -5V is very important ... and on J4 and J7 there are two pins on each connector for this ... it would be possible to send the -5 to the board  on on pin say J4 pin 9,  and use pin 10 as a "safety circuit" ...  same for J7 pins 17, 18 ... send the -5 on one pin, bring it back to the PSU board from the other pin for detection ...   now you can know not only is the -5 correctly generated on the PSU board, but the wiring and connectors are all good also ... 2 safety circuits for the -5V directly from the module?


On Mon, 22 Mar 2021 at 21:57, Marek Rejf <sp4elf@...> wrote:
Hello
The power supply for the Wavelab  24GHz trv module has been launched.
More information soon on the forum " http://mikrofale.cafe/showthread.php?tid=197&pid=698#pid698 " .

Diagram of the power module

 



73 Marek SP4ELF


--
Robin Szemeti - G1YFG


Re: Wavelab 2W 24Ghz TRV

Marek Rejf
 

Hello
The power supply for the Wavelab  24GHz trv module has been launched.
More information soon on the forum " http://mikrofale.cafe/showthread.php?tid=197&pid=698#pid698 " .

Diagram of the power module

 



73 Marek SP4ELF


Re: 10 MHz Reference Distribution Amplifier

Tim Hague M0AFJ
 

That is what I have done with my Leo Bodnar GPSDO and my 4 transverters and counter. Works fine

Best Regards
Tim Hague M0AFJ


On 22 Mar 2021, at 19:13, Greg - ZL3IX <zl3ix@...> wrote:

Depending on the input impedance of your client devices, and how many of them you have, you could try daisy chaining them using BNC Tee pieces, with a 50 ohm termination at the far end. This is done successfully with up to 8 devices (all with Hi-Z inputs) on some professional radio sites.


Re: 10 MHz Reference Distribution Amplifier

Greg - ZL3IX
 

Depending on the input impedance of your client devices, and how many of them you have, you could try daisy chaining them using BNC Tee pieces, with a 50 ohm termination at the far end. This is done successfully with up to 8 devices (all with Hi-Z inputs) on some professional radio sites.


Re: OZ8AFC 8.4 GHz Feedhorn with adjustable Scalar Rings

Keith
 

Hi Ole,
well one is on its way to my " shelf" as we speak :)
It is made for 8.5 Ghz which is where I intend to use it, but I can find very little about them. 
All I really want to know is the f/d range it will most likely cover.
Many thanks 
73
Keith


Re: OZ8AFC 8.4 GHz Feedhorn with adjustable Scalar Rings

Alan
 

Hi Keith,

I still use one of Palle's offset 3cm horns - Sadly he died in a car crash I think almost 10 years ago quite soon after I bought it.

73 Alan GM0USI/P



07785744643

info@...

www.alandimmick.com

instagram @alandimmick

Studio 331

60-64 Osborne St

South Block

Glasgow

G1 5QH






From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Keith <Keith@...>
Sent: 22 March 2021 05:45
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] OZ8AFC 8.4 GHz Feedhorn with adjustable Scalar Rings
 
Is anyone familiar with the above feed please ?
Information is very limited as apparently they were made to order and frequency. 
I assume there would have been versions for 10 ghz so thought I'd ask here.
Any info appreciated and hopefully pics attached.
73
Keith


Re: OZ8AFC 8.4 GHz Feedhorn with adjustable Scalar Rings

Ole OZ2OE
 

Hi Keith

OZ8AFC (SK) produced feedhorns for 5,7GHz, 8,4GHz, 10 GHz and combi 10/24 GHz. After his untimely death OZ9ZZ and I acquired the stock of unfinished parts and started assembling/finishing feedhorns. The revenue from sales has been used for operating the OZ5SHF beacon system.

All feeds are long gone - although I guess a good part ended up on shelves.

73 Ole OZ2OE


 

Den 22. marts 2021 kl. 06.45.52 +01.00, skrev Keith <Keith@...>:

Is anyone familiar with the above feed please ?
Information is very limited as apparently they were made to order and frequency. 
I assume there would have been versions for 10 ghz so thought I'd ask here.
Any info appreciated and hopefully pics attached.
73
Keith


Re: Dmm switch contacts ...........

Gordon REASON <gordonj.reason@...>
 

Thankyou Phil .....I'l see what I can do ........

On 21 March 2021 at 22:32 Phil Guttridge G3TCU <p.guttridge@...> wrote:

I have a couple of scrap DMMs Gordon, if you have other contacts like the one you need to replace, could you send me a pic?

73, Phil G3TCU

On 21/03/2021 22:26, Gordon REASON via groups.io wrote:

Trying to mod my cheap dmm for a louder sounder , and I've lost a rotary switch sprung contact ......

They seem impossible to obtain , but do any of you genious'es on ere , know of a source .......

Trying to make some , but it's hit and miss !

Thanks .



Virus-free. www.avg.com


 


 


OZ8AFC 8.4 GHz Feedhorn with adjustable Scalar Rings

Keith
 

Is anyone familiar with the above feed please ?
Information is very limited as apparently they were made to order and frequency. 
I assume there would have been versions for 10 ghz so thought I'd ask here.
Any info appreciated and hopefully pics attached.
73
Keith


Re: Dmm switch contacts ...........

Phil Guttridge G3TCU
 

I have a couple of scrap DMMs Gordon, if you have other contacts like the one you need to replace, could you send me a pic?

73, Phil G3TCU

On 21/03/2021 22:26, Gordon REASON via groups.io wrote:

Trying to mod my cheap dmm for a louder sounder , and I've lost a rotary switch sprung contact ......

They seem impossible to obtain , but do any of you genious'es on ere , know of a source .......

Trying to make some , but it's hit and miss !

Thanks .


Virus-free. www.avg.com


Dmm switch contacts ...........

Gordon REASON <gordonj.reason@...>
 

Trying to mod my cheap dmm for a louder sounder , and I've lost a rotary switch sprung contact ......

They seem impossible to obtain , but do any of you genious'es on ere , know of a source .......

Trying to make some , but it's hit and miss !

Thanks .


Re: 10 MHz Reference Distribution Amplifier

Stephen Tompsett
 

I use very similar 8 port units for distribution of 10MHz to the radio equipment (transceivers and transverters)...

I used the TAPR TADD-1 (https://tapr.org/product/tadd-1-rf-distribution-amplifier/) in my main frequency reference system for distributing the signal to test equipment - nice but considerably more expensive...

On 21/03/2021 16:55, Norman Stewart via groups.io wrote:
Anyone had success with either of these or similar items for distributing a 10 MHz reference signal to multiple equipment?

LiNKFOR SDI Splitter 1 x 4 with Certified Power Adapter: Amazon.co.uk: Electronics

#N/A 4 Way BNC Composite Video Splitter BNC Interface: Amazon.co.uk: Electronics

73
--
Norman Stewart GM1CNH
-- 
Stephen Tompsett (G8LYB)
Tel: 01788 578940
Mob: 07956 855816


Re: 10 MHz Reference Distribution Amplifier

DD1US
 

Hi Dave,

 

very nice.

 

Based on your design here is another option including output transformers:

 

http://www.dd1us.de/Downloads/10%20MHz%20distribution%20unit%20with%204%20isolated%20outputs%20v3.pdf

 

Marek, SP4ELF, a good friend of mine made the layout.

 

Kind regards

 

Matthias

 

www.dd1us.de

 

 

Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Im Auftrag von David Robinson
Gesendet: Sonntag, 21. März 2021 21:17
An: UKMicrowaves@groups.io
Betreff: Re: [UKMicrowaves] 10 MHz Reference Distribution Amplifier

 

Thats the one I use. i even did a pcb for it (without the doubler) Have four 4 ways in use currently

http://g4fre.com/10MHz_distribution.htm

Dave
G4FRE

I built one using high speed op-amps


Re: 10 MHz Reference Distribution Amplifier

David Robinson
 

Thats the one I use. i even did a pcb for it (without the doubler) Have four 4 ways in use currently

http://g4fre.com/10MHz_distribution.htm

Dave
G4FRE

I built one using high speed op-amps

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