Date   

Re: OZ8AFC 8.4 GHz Feedhorn with adjustable Scalar Rings

Keith
 

Thanks for the info folks, both online and off.
It arrived this morning, a beautiful piece of machining.
Now I have to find the right dish to use it in :(
Cheers
Keith VK6KB /VK6EME


Re: GRP tube

Gordon REASON <gordonj.reason@...>
 

www.hongbangcomposites.com/

Bbbbbbbest I can find on a quick search .............

I have messaged a pipe company in the west midlands  too .....................

On 24 March 2021 at 23:30 "Gordon REASON via groups.io" <gordonj.reason@...> wrote:

Ok Colin ,

Well if you have some .......... there must be more out there , somewhere .............

Perhaps an email to a scaffold pipe manufacturer might get a result ..............

Never give up .

On 24 March 2021 at 23:23 Colin Ranson <g8lbs@...> wrote:

Hi Gordon,

 

Neither of those you mentioned would be strong enough.   Just as an aside they now make Glass Fibre scaffold tube.... its as strong as the steel one apparently.

 

I only need a four foot length but if it was cheap enough I’d get a 6m length and sell the rest on e-bay.... I fear it’s well pricey though.

 

I have a two foot length here that was left over from making the GB3IH collinears 30 years ago, it was like hens teeth then.

 

Regards and thanks for reply

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Gordon REASON via groups.io
Sent: 24 March 2021 23:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 

 

 


 


 


 


 


Re: GRP tube

Gordon REASON <gordonj.reason@...>
 

Ok Colin ,

Well if you have some .......... there must be more out there , somewhere .............

Perhaps an email to a scaffold pipe manufacturer might get a result ..............

Never give up .

On 24 March 2021 at 23:23 Colin Ranson <g8lbs@...> wrote:

Hi Gordon,

 

Neither of those you mentioned would be strong enough.   Just as an aside they now make Glass Fibre scaffold tube.... its as strong as the steel one apparently.

 

I only need a four foot length but if it was cheap enough I’d get a 6m length and sell the rest on e-bay.... I fear it’s well pricey though.

 

I have a two foot length here that was left over from making the GB3IH collinears 30 years ago, it was like hens teeth then.

 

Regards and thanks for reply

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Gordon REASON via groups.io
Sent: 24 March 2021 23:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 

 

 


 


 


Re: GRP tube

Colin Ranson
 

Hi Gordon,

 

Neither of those you mentioned would be strong enough.   Just as an aside they now make Glass Fibre scaffold tube.... its as strong as the steel one apparently.

 

I only need a four foot length but if it was cheap enough I’d get a 6m length and sell the rest on e-bay.... I fear it’s well pricey though.

 

I have a two foot length here that was left over from making the GB3IH collinears 30 years ago, it was like hens teeth then.

 

Regards and thanks for reply

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Gordon REASON via groups.io
Sent: 24 March 2021 23:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 

 


Re: GRP tube

Gordon REASON <gordonj.reason@...>
 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 


GRP tube

Colin Ranson
 

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


Re: GB3PKT 10 Ghz Beacon

david656179
 

Well thanks for all the replies.  Now have feint traces on Spectran, so I suppose conditions could be said to be improving tonight !

To date since I started this 10 GHz lark it has always been much better than this.

I shall be on tonight and looking out for you.  If your on have a good evening chaps and thanks again.

David


Re: GB3PKT 10 Ghz Beacon

John Fell
 

Just looked and saw a very brief AS signal from it - otherwise it has been a victim of the current stable conditions .
73
John
G0API

On Tue, 23 Mar 2021 at 16:57, david656179 via groups.io <david.m.k=btinternet.com@groups.io> wrote:
Can somebody confirm that GB3PKT is on air please.  It is always a good signal here in JO02, albeit scattered at times.

Thanks



Re: GB3PKT 10 Ghz Beacon

Neil Smith G4DBN
 

I haven't heard it since 23:30 on 20th March, even by aircraft scatter.  Under "normal" conditions, I get a faint whiff of troposcatter with lots of scintillation, usually detectable at -18dB or so on JT4. If things are poor, I can at least see a smear from the minute of carrier/fsk, but haven't see a thing.  Nothing from EU either though.  I have been hearing GB3OSW over a couple of 1500 ft hills, and GB3KBQ at 340 km.  PKT is only 250km from here and int the absence of CAM, it is just about the most common one I hear.

I was getting a faint trace from GB3CSB last night, but no decodes and no planes for scatter.

Neil G4DBN

On 23/03/2021 16:57, david656179 via groups.io wrote:
Can somebody confirm that GB3PKT is on air please.  It is always a good signal here in JO02, albeit scattered at times.

Thanksn.uk


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

1881 - 1900 of 63517