Date   

Re: F/GM0USI/P IN78/88 3cm next week

John McCarthy
 

Ditto can do Thursday so looks like you got three willing participants. To Noel will meet you at lane end and if that doesn't work we can always try pickets post maybe? 
John


On Tue, 19 Jul, 2016 at 18:44, 'Noel Matthews' noel@... [ukmicrowaves]
wrote:
 

I can do 3pm (UK) on Thursday but not Friday.

73 – Noel G8GTZ

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Tuesday, July 19, 2016 6:39 PM
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

 

Hello again,

 

I wonder if we should leave the test until a little later in the week when Ed can be qrv....l worked Ralph today just to test the kit was ok...He was 59+ and l around 57 from IN88AQ. ....He said it might be better to wait until 4pm or so when the temp has cooled off a bit though it should be a bit cooler anyway....

What about 4pm (3pm) on Thursday or Friday if that suits....let me know any other times might be better for you.. l could be qrv pretty quickly if required and l am about..

 

73 Alan F/GM0USI/P

 

 

 

Sent from my Samsung device



-------- Original message --------
From: "Edward Harland g3vpf@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 19/07/2016 05:35 (GMT+01:00)
To: ukmicrowaves@..., ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

Alan

 

Regrettably Weds is the only day this week I can't make, tied up in a meeting in Southampton all day. For info there was all the visual signs of a super-refraction duct out in the Channel this afternoon. Also, the weather will change overnight Tuesday into Wednesday to much cooler air so little chance of surface ducts after that.

 

Ed G3VPF

 

 

Yep you've picked a week of good weather Wednesday is good for me, have to be somewhere in the morning but should be done by lunch so will head straight over to lane end 

73 John

 

 

Hi there,

 

Have arrived in the Roscoff area and am staying for a week in St Pol de.Leon just to the south...wx looks extremely warm tomorrow so thinking Wednesday around 13-1500local...local time here is 1 hour ahead...

I can use my phone for calls and data so l can easily phone or attempt to get on KST...l will be using 10368.120...cw possible also

Kit is only around 1.75w to a flatflat panel antenna of around 20db...

Hopefully l haven't forgotten anything..

If Wednesday doesn't suit l may be able to make time on another occasion. .

Locator should be about IN88AQ but that may change if l can't get a parking space hi.

73 Alan F/GM0USI/P 07785744643

 

 

 

 

Sent from my Samsung device

-------- Original message --------
From: "Alan Dimmick dimmickalan@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 18/07/2016 01:03 (GMT+01:00)
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

No probs Adrian,

 

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

 

73 Alan

 

 

 

Sent from my Samsung device



-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems

Adrian 07778 523 832   adrianwhatmore248@...

 


Re: F/GM0USI/P IN78/88 3cm next week

Noel G8GTZ
 

I can do 3pm (UK) on Thursday but not Friday.

73 – Noel G8GTZ

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Tuesday, July 19, 2016 6:39 PM
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

 

Hello again,

 

I wonder if we should leave the test until a little later in the week when Ed can be qrv....l worked Ralph today just to test the kit was ok...He was 59+ and l around 57 from IN88AQ. ....He said it might be better to wait until 4pm or so when the temp has cooled off a bit though it should be a bit cooler anyway....

What about 4pm (3pm) on Thursday or Friday if that suits....let me know any other times might be better for you.. l could be qrv pretty quickly if required and l am about..

 

73 Alan F/GM0USI/P

 

 

 

Sent from my Samsung device



-------- Original message --------
From: "Edward Harland g3vpf@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 19/07/2016 05:35 (GMT+01:00)
To: ukmicrowaves@..., ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

Alan

 

Regrettably Weds is the only day this week I can't make, tied up in a meeting in Southampton all day. For info there was all the visual signs of a super-refraction duct out in the Channel this afternoon. Also, the weather will change overnight Tuesday into Wednesday to much cooler air so little chance of surface ducts after that.

 

Ed G3VPF

 

 

Yep you've picked a week of good weather Wednesday is good for me, have to be somewhere in the morning but should be done by lunch so will head straight over to lane end 

73 John

 

 

Hi there,

 

Have arrived in the Roscoff area and am staying for a week in St Pol de.Leon just to the south...wx looks extremely warm tomorrow so thinking Wednesday around 13-1500local...local time here is 1 hour ahead...

I can use my phone for calls and data so l can easily phone or attempt to get on KST...l will be using 10368.120...cw possible also

Kit is only around 1.75w to a flatflat panel antenna of around 20db...

Hopefully l haven't forgotten anything..

If Wednesday doesn't suit l may be able to make time on another occasion. .

Locator should be about IN88AQ but that may change if l can't get a parking space hi.

73 Alan F/GM0USI/P 07785744643

 

 

 

 

Sent from my Samsung device

-------- Original message --------
From: "Alan Dimmick dimmickalan@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 18/07/2016 01:03 (GMT+01:00)
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

No probs Adrian,

 

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

 

73 Alan

 

 

 

Sent from my Samsung device



-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems

Adrian 07778 523 832   adrianwhatmore248@...

 


Re: F/GM0USI/P IN78/88 3cm next week

Alan
 

Hello again,

I wonder if we should leave the test until a little later in the week when Ed can be qrv....l worked Ralph today just to test the kit was ok...He was 59+ and l around 57 from IN88AQ. ....He said it might be better to wait until 4pm or so when the temp has cooled off a bit though it should be a bit cooler anyway....
What about 4pm (3pm) on Thursday or Friday if that suits....let me know any other times might be better for you.. l could be qrv pretty quickly if required and l am about..

73 Alan F/GM0USI/P



Sent from my Samsung device


-------- Original message --------
From: "Edward Harland g3vpf@... [ukmicrowaves]"
Date: 19/07/2016 05:35 (GMT+01:00)
To: ukmicrowaves@..., ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

Alan


Regrettably Weds is the only day this week I can't make, tied up in a meeting in Southampton all day. For info there was all the visual signs of a super-refraction duct out in the Channel this afternoon. Also, the weather will change overnight Tuesday into Wednesday to much cooler air so little chance of surface ducts after that.

Ed G3VPF


 

Yep you've picked a week of good weather Wednesday is good for me, have to be somewhere in the morning but should be done by lunch so will head straight over to lane end 

73 John


 

Hi there,

Have arrived in the Roscoff area and am staying for a week in St Pol de.Leon just to the south...wx looks extremely warm tomorrow so thinking Wednesday around 13-1500local...local time here is 1 hour ahead...
I can use my phone for calls and data so l can easily phone or attempt to get on KST...l will be using 10368.120...cw possible also
Kit is only around 1.75w to a flatflat panel antenna of around 20db...
Hopefully l haven't forgotten anything..
If Wednesday doesn't suit l may be able to make time on another occasion. .
Locator should be about IN88AQ but that may change if l can't get a parking space hi.
73 Alan F/GM0USI/P 07785744643




Sent from my Samsung device
-------- Original message --------
From: "Alan Dimmick dimmickalan@... [ukmicrowaves]"
Date: 18/07/2016 01:03 (GMT+01:00)
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

No probs Adrian,

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

73 Alan



Sent from my Samsung device


-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]"
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems
Adrian 07778 523 832   adrianwhatmore248@...


Re: OZ5N Auto PLL

geoffrey pike
 

I was surprised at the 10k and then equally surprised that my brand new Ebay 5mm blue LEDs worked a treat !
Geoff


On Tuesday, 19 July 2016, 16:16, "'mike' mb.golfmad@... [ukmicrowaves]" wrote:


 

Thank you Andy, I stand corrected, 210 ohms indeed it was!!
 
Mike G6TRM
 
----- Original Message -----
Sent: Tuesday, July 19, 2016 3:48 PM
Subject: Re: [ukmicrowaves] OZ5N Auto PLL

 
factor of 10 out
 2.1v/10mA = 210 ohms
Use 220R

'jnt


On 19 July 2016 at 15:46, 'mike' mb.golfmad@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Hi Kevin,
Hopefully If I add to the list of those who have modified their DB6TN 10ghz Transverter, it will inspire you a little more to go ahead and try.....
My modifications were very similar to Geoff's...I too have photos. if you think that will help please ask..
 
One small issue for me was using the option of an external LED, on inspecting the circuit, a current a limiting resistor of 10k was on the board ( not enough to drive a conventional LED). As I had loads of "normal" leds ( not low volt versions) .. I decided to change the 10k resistor (R9) for a more suitable value.. I checked the PIC pin had enough drive, no problem,  I choose a value of    2k2 for 9/10ma of current.
3.3v -1.2v(LED volt drop) = 2.1v/10mA = 2100R,  2k2 selected.  It all works well, nice and bright... before I did the mod I checked what the original circuit would do...I could hardly see the led was on...certainly not in bright sunlight..no good for me...I guess overall current drawn has gone up but is so small as not to be an issue.
 
hope this helps,
 
cheers,
 
Mike G6TRM
 
----- Original Message -----
Sent: Tuesday, July 19, 2016 1:11 PM
Subject: Re: [ukmicrowaves] OZ5N Auto PLL

 
Hi Kevin,
The pics are too big for attaching so please go to the files section under OZ5N folder
Hope they are of some use
Geoff
GI0GDP




Re: OZ5N Auto PLL

mike G6TRM
 


Thank you Andy, I stand corrected, 210 ohms indeed it was!!
 
Mike G6TRM
 

----- Original Message -----
Sent: Tuesday, July 19, 2016 3:48 PM
Subject: Re: [ukmicrowaves] OZ5N Auto PLL

 

factor of 10 out
 2.1v/10mA = 210 ohms
Use 220R

'jnt


On 19 July 2016 at 15:46, 'mike' mb.golfmad@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 



Hi Kevin,
Hopefully If I add to the list of those who have modified their DB6TN 10ghz Transverter, it will inspire you a little more to go ahead and try.....
My modifications were very similar to Geoff's...I too have photos. if you think that will help please ask..
 
One small issue for me was using the option of an external LED, on inspecting the circuit, a current a limiting resistor of 10k was on the board ( not enough to drive a conventional LED). As I had loads of "normal" leds ( not low volt versions) .. I decided to change the 10k resistor (R9) for a more suitable value.. I checked the PIC pin had enough drive, no problem,  I choose a value of    2k2 for 9/10ma of current.
3.3v -1.2v(LED volt drop) = 2.1v/10mA = 2100R,  2k2 selected.  It all works well, nice and bright... before I did the mod I checked what the original circuit would do...I could hardly see the led was on...certainly not in bright sunlight..no good for me...I guess overall current drawn has gone up but is so small as not to be an issue.
 
hope this helps,
 
cheers,
 
Mike G6TRM
 
----- Original Message -----
Sent: Tuesday, July 19, 2016 1:11 PM
Subject: Re: [ukmicrowaves] OZ5N Auto PLL

 

Hi Kevin,
The pics are too big for attaching so please go to the files section under OZ5N folder
Hope they are of some use
Geoff
GI0GDP



Re: OZ5N Auto PLL

Andy G4JNT
 

factor of 10 out
 2.1v/10mA = 210 ohms
Use 220R

'jnt


On 19 July 2016 at 15:46, 'mike' mb.golfmad@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 



Hi Kevin,
Hopefully If I add to the list of those who have modified their DB6TN 10ghz Transverter, it will inspire you a little more to go ahead and try.....
My modifications were very similar to Geoff's...I too have photos. if you think that will help please ask..
 
One small issue for me was using the option of an external LED, on inspecting the circuit, a current a limiting resistor of 10k was on the board ( not enough to drive a conventional LED). As I had loads of "normal" leds ( not low volt versions) .. I decided to change the 10k resistor (R9) for a more suitable value.. I checked the PIC pin had enough drive, no problem,  I choose a value of    2k2 for 9/10ma of current.
3.3v -1.2v(LED volt drop) = 2.1v/10mA = 2100R,  2k2 selected.  It all works well, nice and bright... before I did the mod I checked what the original circuit would do...I could hardly see the led was on...certainly not in bright sunlight..no good for me...I guess overall current drawn has gone up but is so small as not to be an issue.
 
hope this helps,
 
cheers,
 
Mike G6TRM
 
----- Original Message -----
Sent: Tuesday, July 19, 2016 1:11 PM
Subject: Re: [ukmicrowaves] OZ5N Auto PLL

 

Hi Kevin,
The pics are too big for attaching so please go to the files section under OZ5N folder
Hope they are of some use
Geoff
GI0GDP



Re: OZ5N Auto PLL

mike G6TRM
 


Hi Kevin,
Hopefully If I add to the list of those who have modified their DB6TN 10ghz Transverter, it will inspire you a little more to go ahead and try.....
My modifications were very similar to Geoff's...I too have photos. if you think that will help please ask..
 
One small issue for me was using the option of an external LED, on inspecting the circuit, a current a limiting resistor of 10k was on the board ( not enough to drive a conventional LED). As I had loads of "normal" leds ( not low volt versions) .. I decided to change the 10k resistor (R9) for a more suitable value.. I checked the PIC pin had enough drive, no problem,  I choose a value of    2k2 for 9/10ma of current.
3.3v -1.2v(LED volt drop) = 2.1v/10mA = 2100R,  2k2 selected.  It all works well, nice and bright... before I did the mod I checked what the original circuit would do...I could hardly see the led was on...certainly not in bright sunlight..no good for me...I guess overall current drawn has gone up but is so small as not to be an issue.
 
hope this helps,
 
cheers,
 
Mike G6TRM
 

----- Original Message -----
Sent: Tuesday, July 19, 2016 1:11 PM
Subject: Re: [ukmicrowaves] OZ5N Auto PLL

 

Hi Kevin,
The pics are too big for attaching so please go to the files section under OZ5N folder
Hope they are of some use
Geoff
GI0GDP


Re: Measuring Noise Figure

Christopher Bartram <cbartram@...>
 

Like Andy, a long while ago (late '70s) I also used the hot/cold load method to estimate NF. In my case at 144, 432, and 1296MHz. As they for the purpose of my measurements they were relatively easy to define physically, I used the temperatures of the triple-point (ie. effectively melting ice) and boiling water. All good standard school physics lab. stuff.

The load - which remained connected - was an 1/8W metal film resistor de-leaded and suitably waterproofed. No change of return-loss was detectable over the 0 - 100C range.

My noise receiver at that time was a linear 2ishMHz-wide IF strip with a square-law detector at 29MHz preceded by a 2m converter. It was easy to check the linearity of the detector, while the assumption that the noise spectrum at the amplifier output didn't change between the two source temperatures seemed reasonable - and still forms part of the assumptions made by modern, high-end NF-ometers.

That system was sufficiently accurate to confirm the measurements of the 144MHz amplifiers which I'd designed made with a commercial saturated thermionic diode noise source based NF-ometer. This unit effectively used the same technique as Chis Trask outlined. The performance of the commercial unit wasn't good enough to make realistic measurements at higher frequencies, but I was able to get a friend, working in the research labs of a semiconductor company, to measure my other amplifiers, and there was also good agreement.

A few months later, I brought (brand-new!) an HP346 source. That still forms the basis of my NF measurement kit, and is still producing readings which correlate well with other sources/instruments to beyond 10GHz - including modern Keysight demonstrators. Nowadays I use the source with an HP8790B. The home-brew IF strip still exists, and is just about to to be used as part of a new microwave EME system in order to enable accurate cold sky/Sun, cold sky/Moon and cold sky/ground measurements.

The hot/cold source technique is still probably the only way of making realistic measurements, and I'm very dubious indeed about noise figure '_measurement _' systems which don't use some form of calibrated source.

If you want to learn more about NF measurement, I very strongly suggest a careful read of the HP application note written by Ian White, GM3SEK and David Stockton, GM4ZNX.



Vy 73

Chris
GW4DGU


Re: OZ5N Auto PLL

geoffrey pike
 

Hi Kevin,
The pics are too big for attaching so please go to the files section under OZ5N folder
Hope they are of some use
Geoff
GI0GDP


Re: Measuring Noise Figure

Andy G4JNT
 

I did it once with boiling water and room temperature on what was supposed to be a low noise amp (144MHz) of the late 1980s era.  I saw  a genuine "fraction of a dB" but back then didn't have the means to measure mean noise power reliably or accurately, especially in a wide bandwidth.

Simplistically:
Assume a 1dB noise figure LNA with sufficient gain to overcome any following stages.
1dB is equivalent to a noise temp T of  75K   (  since NF = 10.LOG(T / 290 + 1)

So the delta noise power seen at the output of the system for input at 100C = 373K and  Room Temp 290K 
= :
10.LOG[ (373 + 75) / (290 + 75) ]  = 0.89dB

Which ought to be measurable with modern wide bandwidth SDRs.  It wasn't reliable using a diode on the output of an SSB Rx in 1988 !

Andy  G4JNT

On 19 July 2016 at 11:54, Richard Baker perwick@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Any noise measurement you make with an open transmission line is going to be dependant on its length.

Rather than me try to explain the theory I suggest you try the following experiment.

Connect a good 50 ohm dummy load to your 432MHz or above receiver under test and note the noise level (reading 1). Now disconnect the dummy load and take a series of readings (readings 2) with different lengths of open transmission line attached. Easily done by adding adaptors or short lengths of coax. You should find reading 2 is dependant on the length of the open transmission line. Finally add a dummy load to the end of your adjustable length transmission line to confirm you get the same value as reading 1.
 
If you are looking for a minimum equipment noise estimate I suggest you put your dummy load in the deep freeze for a few hours and while still very cold connect it to your receiver and note the noise level. Now let it warm to room temperature and note the reading again. You are looking for a very small change in noise level and indeed you might need to heat your dummy load to about 100C to see an easy to read difference. This is the hot and cold dummy load method and it should be reasonably accurate as long as the impedance of your dummy load does not change much with temperature.
 
I would be interested in what readings people get.
 
Richard
GD8EXI




On 18/07/2016, 18:19, "richard@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 
 
 
   

"Thoroughly disagree"  Thanks for your reply Chris. I am not clear with which approach you thoroughly disagree with however.

a) the gain method of measuring noise figure
b) measuring without an input load
c) measuring with an input load; or possibly
d) Derek's approach.

73 Richard G3CWI
 
   




Re: Measuring Noise Figure

Richard GD8EXI
 

Any noise measurement you make with an open transmission line is going to be dependant on its length.

Rather than me try to explain the theory I suggest you try the following experiment.

Connect a good 50 ohm dummy load to your 432MHz or above receiver under test and note the noise level (reading 1). Now disconnect the dummy load and take a series of readings (readings 2) with different lengths of open transmission line attached. Easily done by adding adaptors or short lengths of coax. You should find reading 2 is dependant on the length of the open transmission line. Finally add a dummy load to the end of your adjustable length transmission line to confirm you get the same value as reading 1.
 
If you are looking for a minimum equipment noise estimate I suggest you put your dummy load in the deep freeze for a few hours and while still very cold connect it to your receiver and note the noise level. Now let it warm to room temperature and note the reading again. You are looking for a very small change in noise level and indeed you might need to heat your dummy load to about 100C to see an easy to read difference. This is the hot and cold dummy load method and it should be reasonably accurate as long as the impedance of your dummy load does not change much with temperature.
 
I would be interested in what readings people get.
 
Richard
GD8EXI




On 18/07/2016, 18:19, "richard@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 
 
 
   

"Thoroughly disagree"  Thanks for your reply Chris. I am not clear with which approach you thoroughly disagree with however.

a) the gain method of measuring noise figure
b) measuring without an input load
c) measuring with an input load; or possibly
d) Derek's approach.

73 Richard G3CWI
 
   



New file uploaded to ukmicrowaves

ukmicrowaves@...
 

Hello,


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New file uploaded to ukmicrowaves

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Hello,


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Re: F/GM0USI/P IN78/88 3cm next week

Alan
 

Ok..Ed,

I will see how it goes on Wednesday with the other stations..am sure l can certainly try another time up to Sunday when you might be able to make it...

73 Alan



Sent from my Samsung device


-------- Original message --------
From: "Edward Harland g3vpf@... [ukmicrowaves]"
Date: 19/07/2016 08:44 (GMT+01:00)
To: ukmicrowaves@..., ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

Alan


Regrettably Weds is the only day this week I can't make, tied up in a meeting in Southampton all day. For info there was all the visual signs of a super-refraction duct out in the Channel this afternoon. Also, the weather will change overnight Tuesday into Wednesday to much cooler air so little chance of surface ducts after that.

Ed G3VPF


 

Yep you've picked a week of good weather Wednesday is good for me, have to be somewhere in the morning but should be done by lunch so will head straight over to lane end 

73 John


 

Hi there,

Have arrived in the Roscoff area and am staying for a week in St Pol de.Leon just to the south...wx looks extremely warm tomorrow so thinking Wednesday around 13-1500local...local time here is 1 hour ahead...
I can use my phone for calls and data so l can easily phone or attempt to get on KST...l will be using 10368.120...cw possible also
Kit is only around 1.75w to a flatflat panel antenna of around 20db...
Hopefully l haven't forgotten anything..
If Wednesday doesn't suit l may be able to make time on another occasion. .
Locator should be about IN88AQ but that may change if l can't get a parking space hi.
73 Alan F/GM0USI/P 07785744643




Sent from my Samsung device
-------- Original message --------
From: "Alan Dimmick dimmickalan@... [ukmicrowaves]"
Date: 18/07/2016 01:03 (GMT+01:00)
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

No probs Adrian,

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

73 Alan



Sent from my Samsung device


-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]"
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems
Adrian 07778 523 832   adrianwhatmore248@...


Re: Measuring Noise Figure

Chris Trask <christrask@...>
 

B


"Thoroughly disagree" Thanks for your reply Chris. I am not clear with which approach you thoroughly disagree with however.

a) the gain method of measuring noise figure
b) measuring without an input load
c) measuring with an input load; or possibly
d) Derek's approach.


73 Richard G3CWI

Chris

When the going gets weird, the weird turn pro
- Hunter S. Thompson


Re: OZ5N Auto PLL

Kevin Kerr <kkerr@...>
 

Is there any chance of pictures of how you installed it. I have a working G2 and am extremely nervous about attacking it with a solderong iron.

The picture on the website is a different transverter.

Kevin Kerr

M1BWS


On 18/07/2016 10:59, geoffrey pike gi0gdp@... [ukmicrowaves] wrote:
 
Back to DC matters at 10.368 GHz, i finally fitted my OZ5N auto pll and this is what happened.
Well it really didn't want to lock up at all, i changed the 82 p at the crystal to 56p. I gave everything some time to warm up and although
the blue LED flashed at 1 sec intervals it just wasn't for locking up.I adjusted the coil for a resting frequency about 200 Hz high and tried again and it locked up OK. I measured the control voltage at 1.04v and readjusted for 1.7v as i thought that this would be better and sure enough when i tried it all again the lock up was within 2 seconds.
with a soldering ir
I then put it all back together again and got my signal source fro 10.368200 GHz going and tuned in spot on 144.200 on the 290 and it just sits there rock steady T9. So that only leaves azimuth control of the dish as an unknown !.
regards
Geoff
GI0GDP
I measured the crystal frequency on the collector of the first tripler via a 22p cap


Re: Measuring Noise Figure

Chris Trask <christrask@...>
 

Yes. When I get home I'll locate a PDF document I wrote for doing it.


Hi Chris,

Your method sounds interesting - I'd like to try it.

Can you outline the calculations required, or point to a site or source that has the detail ?

Regards,

Martin - G8JNJ

Chris Trask
N7ZWY / WDX3HLB
Senior Member IEEE
http://www.home.earthlink.net/~christrask/


Re: Measuring Noise Figure

Martin - G8JNJ
 

Hi Chris,

Your method sounds interesting - I'd like to try it.

Can you outline the calculations required, or point to a site or source that has the detail ?

Regards,

Martin - G8JNJ

www.g8jnj.net
www.tc2m.info
http://websdr.suws.org.uk


Re: F/GM0USI/P IN78/88 3cm next week

Ed G3VPF
 

Alan

Regrettably Weds is the only day this week I can't make, tied up in a meeting in Southampton all day. For info there was all the visual signs of a super-refraction duct out in the Channel this afternoon. Also, the weather will change overnight Tuesday into Wednesday to much cooler air so little chance of surface ducts after that.

Ed G3VPF


On Mon, 18 Jul, 2016 at 16:33, 'g7jtt@...' g7jtt@... [ukmicrowaves]
wrote:
 

Yep you've picked a week of good weather Wednesday is good for me, have to be somewhere in the morning but should be done by lunch so will head straight over to lane end 

73 John


 

Hi there,

Have arrived in the Roscoff area and am staying for a week in St Pol de.Leon just to the south...wx looks extremely warm tomorrow so thinking Wednesday around 13-1500local...local time here is 1 hour ahead...
I can use my phone for calls and data so l can easily phone or attempt to get on KST...l will be using 10368.120...cw possible also
Kit is only around 1.75w to a flatflat panel antenna of around 20db...
Hopefully l haven't forgotten anything..
If Wednesday doesn't suit l may be able to make time on another occasion. .
Locator should be about IN88AQ but that may change if l can't get a parking space hi.
73 Alan F/GM0USI/P 07785744643




Sent from my Samsung device
-------- Original message --------
From: "Alan Dimmick dimmickalan@... [ukmicrowaves]"
Date: 18/07/2016 01:03 (GMT+01:00)
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

No probs Adrian,

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

73 Alan



Sent from my Samsung device


-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]"
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems
Adrian 07778 523 832   adrianwhatmore248@...


Re: Measuring Noise Figure

richard@...
 

"Thoroughly disagree"  Thanks for your reply Chris. I am not clear with which approach you thoroughly disagree with however.

a) the gain method of measuring noise figure
b) measuring without an input load
c) measuring with an input load; or possibly
d) Derek's approach.

73 Richard G3CWI