Date   

VK3CV 122GHz DX distances

Noel G8GTZ
 

Neil G4LDR said " We should also keep tabs on the best UK DX achieved by the VK systems (approx. 12km at the moment I think)."

On October 18th 2020 Dave G1EHF and Noel G8GTZ worked 17.03km between IO91GI25WT (Coombe Gibbet) and IOIO91HL86NW (Mud Lane Peasemore).  Barefoot VK3CV units were used at both ends into 60cms 47GHz dishes. 

Hopefully we will be able to improve on that this year and I'm now wishing we had gone out on Wednesday rather than sitting in the warm shack!

73's Noel


Re: Low Microwave Bands contest Sunday 11 April

Phil Guttridge G3TCU
 

We  plan to be out this Sunday, after the long break:

Callsign: M0HNA/P
Locator: IO91RF
Bands: 1.3GHz 400W 67ele
2.3GHz 60W 0.9m dish
3.4GHz 15W 1.1m o/s dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2)

direct CQ on 23cm.
Times: Throughout the event

73, Barry G4SJH, Dave G1EHF, Phil G3TCU



On 03/04/2021 22:12, John Quarmby via groups.io wrote:
The next UK Microwave Group contest is the LowBand event on 11th April from 10:00 - 16:00 GMT (11:00 - 17:00 BST) on the 1296, 2300, 2320, and 3400MHz bands.

As some of the lock down rules have been relaxed, portable entries will now be accepted.

73

John G3XDY
UKuG Contest Manager




Re: New British 122 GHz distance record

Mike Lavelle K6ML
 

Congrats!  


Re: ALC Overrun

Greg - ZL3IX
 

Damage to the transverter isn't the only problem with using a rig with the ALC working very hard. You need to get someone to check your signal for splatter, or better still use a spectrum analyser if you have one. Making a fast-acting ALC that doesn't cause splatter (spectral regrowth) is not an easy design task and many commercial manufacturers don't succeed in that goal.


Re: New British 122 GHz distance record

G4LDR
 

Well done Chris and Roger. That is going to be hard to beat at least until the humidity drops again to the levels seen this week. We should also keep tabs on the best UK DX achieved by the VK systems (approx. 12km at the moment I think).

73 Neil.


Re: New British 122 GHz distance record

Murray Niman
 

Great stuff in the lossy band!
73
Murray


Re: New British 122 GHz distance record

John Quarmby
 

Very well done Chris and Roger, looking forward to reading about it in Scatterpoint.

73

John G3XDY

On 08/04/2021 08:19, Chris G0FDZ wrote:

Hi folks

Yesterday (7th April ) at 1030 UTC a new British 122 GHz distance record was made over 35.925 kms by Roger G8CUB/P and Chris G0FDZ/P, between Danbury in Essex and Minster on the Isle of Sheppey.

More info and photos will be found in the forthcoming edition of Scatterpoint.

Regards

Chris G0FDZ


Virus-free. www.avg.com


Re: low ESR caps on 4351

militaryoperator
 

Ben
Sorry to be obtuse...

I meant :
`as-well-as` "caps across the regulator filter caps" 
or 
`instead-of` "caps across the regulator filter caps" ?

Dave, G1OGY



The boards I have, black type with little screen and 5 buttons to set things, has 10uf SMD fitted on both regs. I simply added these across them, so I guess "as well as", hi. 

Ben.G4BXD


Re: low ESR caps on 4351

Dave (G1OGY)
 

Ben
Sorry to be obtuse...

I meant :
`as-well-as` "caps across the regulator filter caps" 
or 
`instead-of` "caps across the regulator filter caps" ?

Dave, G1OGY


On Wed, 7 Apr 2021 at 23:59, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Don't know Dave, I'm not well versed in the likes of phase noise and pll's etc. 
I just hear what the clever chaps say and try and give it a go. 

Don't even know what I'll use the boards for but thought it best to make the mods just in case, hi. 

Ben



Subject: Re: [UKMicrowaves] low ESR caps on 4351

A useful outcome, Ben.
Surprised to see that much power in the skirts.

Is this `as well as` or `instead of``?

Dave, G1OGY


On Wed, 7 Apr 2021 at 11:55, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Following on from recent posting about fitting LSR caps across the regulator filter caps on 4351 boards, I fitted two 1000uf across the two regulator o/ps. Seems to have helped I think?
Ben

Before                                                                                and after.
cap.jpg
  


Re: ALC Overrun

Andy G4JNT
 

Use a 50 ohm resistor as a load and connect a diode detector across it.  A 1N914 etc will suffice  .   Transmit from your rig into that and use the scope to monitor the diode voltage.   That should show any ALC overshoot.



On Thu, 8 Apr 2021 at 09:48, Algenon <alg_edwards@...> wrote:
Hi Microwave Group 

I’m new to the forum and looking for some advice on what I believe is called ALC Overrun. I am looking at purchasing an SG Labs 1296 transverter to get started on 23cms. All the advice is to use an IF radio with a max output power of 5W. I would like to use my Icom-7100 with the power turned down to 5W as the IF radio but I understand that some radios can momentarily output more power than set  thus damaging the transverter. Does the group have experience of this combo and/or is there a way for me to detect if the radio does output momentarily in excess of the set power. I have basic test equipment: dummy load, power meter, 50Mhz scope which I suspect will not detect any blip. 


ALC Overrun

Algenon M0JIO
 

Hi Microwave Group 

I’m new to the forum and looking for some advice on what I believe is called ALC Overrun. I am looking at purchasing an SG Labs 1296 transverter to get started on 23cms. All the advice is to use an IF radio with a max output power of 5W. I would like to use my Icom-7100 with the power turned down to 5W as the IF radio but I understand that some radios can momentarily output more power than set  thus damaging the transverter. Does the group have experience of this combo and/or is there a way for me to detect if the radio does output momentarily in excess of the set power. I have basic test equipment: dummy load, power meter, 50Mhz scope which I suspect will not detect any blip. 


Re: New British 122 GHz distance record

Barry Chambers
 

Chris, Roger

well done!

73

Barry, G8AGN



On 08/04/2021 09:19, Chris G0FDZ wrote:

Hi folks

Yesterday (7th April ) at 1030 UTC a new British 122 GHz distance record was made over 35.925 kms by Roger G8CUB/P and Chris G0FDZ/P, between Danbury in Essex and Minster on the Isle of Sheppey.

More info and photos will be found in the forthcoming edition of Scatterpoint.

Regards

Chris G0FDZ


Virus-free. www.avg.com
-- 
73
Barry, G8AGN


New British 122 GHz distance record

Chris G0FDZ
 

Hi folks

Yesterday (7th April ) at 1030 UTC a new British 122 GHz distance record was made over 35.925 kms by Roger G8CUB/P and Chris G0FDZ/P, between Danbury in Essex and Minster on the Isle of Sheppey.

More info and photos will be found in the forthcoming edition of Scatterpoint.

Regards

Chris G0FDZ


Virus-free. www.avg.com


Re: low ESR caps on 4351

militaryoperator
 

Don't know Dave, I'm not well versed in the likes of phase noise and pll's etc. 
I just hear what the clever chaps say and try and give it a go. 

Don't even know what I'll use the boards for but thought it best to make the mods just in case, hi. 

Ben



Subject: Re: [UKMicrowaves] low ESR caps on 4351

A useful outcome, Ben.
Surprised to see that much power in the skirts.

Is this `as well as` or `instead of``?

Dave, G1OGY


On Wed, 7 Apr 2021 at 11:55, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Following on from recent posting about fitting LSR caps across the regulator filter caps on 4351 boards, I fitted two 1000uf across the two regulator o/ps. Seems to have helped I think?
Ben

Before                                                                                and after.
cap.jpg
  
_._,_._,_


Re: low ESR caps on 4351

Dave (G1OGY)
 

A useful outcome, Ben.
Surprised to see that much power in the skirts.

Is this `as well as` or `instead of``?

Dave, G1OGY


On Wed, 7 Apr 2021 at 11:55, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Following on from recent posting about fitting LSR caps across the regulator filter caps on 4351 boards, I fitted two 1000uf across the two regulator o/ps. Seems to have helped I think?
Ben

Before                                                                                and after.
  


Re: Retuning a 23cm duplexer, any hints please?

Alan Beard
 

Hi all,

I gave up on the BandPass-BandReject and went with 25mm x 25mm dividers
as in the attached pixture. This reduced the pass bandwidth to 10MHz centered on
1274 MHz and 1294 MHz with 50db or so attenuation of the other frequency.
The input RL is -16db or better.

Measured by the SAA-V2.

Alan VK2ZIW

On Wed, 7 Apr 2021 07:28:52 +1000, Alan Beard via groups.io wrote
> Hi all,
>
>

> Thomas Eddison 'tinkered' until the breakthrough...
>
>

> The figure of 8 loop did the trick.
>
>

>
>

> Where are the 'tinkerers' out there????
>
> I've achieved a super steep slope on the high side of a pass, now
> to see if I can get another super steep slope on the lower frequency 
> side of the high pass. 
>
>

> Come on guys, where's your imagination?
>
>

> Alan VK2ZIW
>
>

> On Tue, 6 Apr 2021 07:44:42 +1000, Alan Beard via groups.io wrote
> > Hi all,
> > Here are my mods to this 1800 MHz duplexer so far:
> >
> > > www.unixservice.com.au/hamradio/repeaters/duplexers/23CMpix/
> > IMG_3809c.JPG
> > Tuning is now much easier with the M3 screws further out, out from the 4mm ID tube.
> >
> > My next question is:
> >


---------------------------------------------------
Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.


Re: Heatshrink

Colin Ranson
 

John,

 

Same here, I have a two setting heat gun as well – and I concur !

 

 

Glad you sorted it.

 

Regards   Colin.

 

Sent from Mail for Windows 10

 

From: John Lemay
Sent: 07 April 2021 16:48
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Heatshrink

 

Hello all

Thanks for your helpful comments about heatshrink, on and off list.

Turns out, after some experimentation today, that it is pilot error -
although I'd prefer to blame my tools; My two setting heat gun has turned
itself into a single setting - the low one of course - and it is man enough
to shrink the material but not enough to get the glue flowing nicely.

Time for a bit of retail therapy !

John G4ZTR

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of
Conrad, PA5Y
Sent: 07 April 2021 09:57
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Heatshrink

Hi Frank I use Raychem heatshrink with overlapped 3M self-amalgamating tape
and finally Denso tape. I also have bright shiny connectors after a good
number of years. Don't forget to wind the tape so that when it tries to
unravel it tightens the connector. I am sure I'm not the only one who has
seen that if you do it wrong it can unscrew the connectors. Not seen this
happen for years but I have heard from other installers that it is quite
common.

Denso tape is really the best thing for the job.

73

Conrad PA5Y

-----Original Message-----
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of frank
evans via groups.io
Sent: 07 April 2021 00:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Heatshrink

John

As someone who spent his working life installing professional communications
aerials can I recommend you to Denso tape, It's the absolute best. A light
Hessian tape seriously impregnated with a heavy wax. Inexpensive, and
available in a range of widths from your local plumber's merchants or on
line

Frank GW8AWM

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of
John Lemay
Sent: 06 April 2021 19:38
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Heatshrink


I've spent part of today tidying up cables and repositioning masthead boxes
on 23, 13 and 9cms. While doing this it became clear that I could make a
better job of it by changing an angle N type to a straight one.

When I stripped back the glued heatshrink I discovered that it had not
adhered to the cable (LDF4-50) at all, and it wasn't much better on the plug
body. It wasn't an eBay cheapo buy, but it wasn't from Andrews/Commscope
either.

Any recommendations for decent quality sticky heatshrink please ?

Thanks

John G4ZTR























 


Re: Heatshrink

John Lemay
 

Hello all

Thanks for your helpful comments about heatshrink, on and off list.

Turns out, after some experimentation today, that it is pilot error -
although I'd prefer to blame my tools; My two setting heat gun has turned
itself into a single setting - the low one of course - and it is man enough
to shrink the material but not enough to get the glue flowing nicely.

Time for a bit of retail therapy !

John G4ZTR

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of
Conrad, PA5Y
Sent: 07 April 2021 09:57
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Heatshrink

Hi Frank I use Raychem heatshrink with overlapped 3M self-amalgamating tape
and finally Denso tape. I also have bright shiny connectors after a good
number of years. Don't forget to wind the tape so that when it tries to
unravel it tightens the connector. I am sure I'm not the only one who has
seen that if you do it wrong it can unscrew the connectors. Not seen this
happen for years but I have heard from other installers that it is quite
common.

Denso tape is really the best thing for the job.

73

Conrad PA5Y

-----Original Message-----
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of frank
evans via groups.io
Sent: 07 April 2021 00:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Heatshrink

John

As someone who spent his working life installing professional communications
aerials can I recommend you to Denso tape, It's the absolute best. A light
Hessian tape seriously impregnated with a heavy wax. Inexpensive, and
available in a range of widths from your local plumber's merchants or on
line

Frank GW8AWM

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of
John Lemay
Sent: 06 April 2021 19:38
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Heatshrink


I've spent part of today tidying up cables and repositioning masthead boxes
on 23, 13 and 9cms. While doing this it became clear that I could make a
better job of it by changing an angle N type to a straight one.

When I stripped back the glued heatshrink I discovered that it had not
adhered to the cable (LDF4-50) at all, and it wasn't much better on the plug
body. It wasn't an eBay cheapo buy, but it wasn't from Andrews/Commscope
either.

Any recommendations for decent quality sticky heatshrink please ?

Thanks

John G4ZTR


low ESR caps on 4351

militaryoperator
 

Following on from recent posting about fitting LSR caps across the regulator filter caps on 4351 boards, I fitted two 1000uf across the two regulator o/ps. Seems to have helped I think?
Ben

Before                                                                                and after.
cap.jpg
  


Re: Heatshrink

Conrad, PA5Y
 

Hi Frank I use Raychem heatshrink with overlapped 3M self-amalgamating tape and finally Denso tape. I also have bright shiny connectors after a good number of years. Don't forget to wind the tape so that when it tries to unravel it tightens the connector. I am sure I'm not the only one who has seen that if you do it wrong it can unscrew the connectors. Not seen this happen for years but I have heard from other installers that it is quite common.

Denso tape is really the best thing for the job.

73

Conrad PA5Y

-----Original Message-----
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of frank evans via groups.io
Sent: 07 April 2021 00:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Heatshrink

John

As someone who spent his working life installing professional communications aerials can I recommend you to Denso tape, It's the absolute best. A light Hessian tape seriously impregnated with a heavy wax. Inexpensive, and available in a range of widths from your local plumber's merchants or on line

Frank GW8AWM

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of John Lemay
Sent: 06 April 2021 19:38
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Heatshrink


I've spent part of today tidying up cables and repositioning masthead boxes on 23, 13 and 9cms. While doing this it became clear that I could make a better job of it by changing an angle N type to a straight one.

When I stripped back the glued heatshrink I discovered that it had not adhered to the cable (LDF4-50) at all, and it wasn't much better on the plug body. It wasn't an eBay cheapo buy, but it wasn't from Andrews/Commscope either.

Any recommendations for decent quality sticky heatshrink please ?

Thanks

John G4ZTR

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