Date   

Re: Denis G3UVR SK

Mike GD6ICR
 

G3UVR Best Elmer Ive ever had and the times with the crew on Cyrn y Brain and Halkyn introduced me to the shorter frquencies amazing times Give a call Keith G6HHK when you are free

Again RIP old friend
--
Mike GD6ICR IO74PF73TW


On QO-100 now, looking for contacts

Nick Gregory G0HIK
 

Hi All,
I'm on qo-100 2400.200.

Looking for contacts if anyone has 2 mins to spare.
Thanks
Nick G0HIK


Re HDL_ANT program

Dave
 

Hello,
I have this program HDL_ANT32_V4p1 (14).exe on my Windows 10 laptop. It is working and gives me a series of dimensions for a feedhorn on 5760mhz. However it does say that there is an error in the H phase centre function, and that I must adjust the length of the horn to match phase centres. (I am matching it to a 0.62 F/D dish.) It suggests an improved design with slightly higher gain (10.3dBi). The H dimension is 34.9 mm and E is 15.9 mm.
It asks if I want to make a change in the dimensions and if I do say yes the screen goes berserk and is not working as it should.
Has anyone had this problem?
David (G4GLT).
PSAlso nowhere do I see a way of printing a template.


Re: What is this Propagation on 23cm's ?

Robin Szemeti - G1YFG
 

What I usually do if I hear one I want in QSO with someone else is to wait to the end of the QSO and if the "wanted" one is frequency "owner" then all is good, and if not then a quick "XXX up 25 please" is all it needs, then go up 25 kcs and start calling them.  it either works or it doesn't.

On a quiet band where there is not much going on, I've had people call into a QSO and we've all worked each other, happy faces all round.



On Sun, 4 Oct 2020 at 21:15, steve G1PPA via groups.io <steveturner249=yahoo.co.uk@groups.io> wrote:

OK Ben
I understand agree its wrong and disappointing 
Steve
G1PPA 


--
Robin Szemeti - G1YFG


Re: What is this Propagation on 23cm's ?

steve G1PPA
 


OK Ben
I understand agree its wrong and disappointing 
Steve
G1PPA 


Re: What is this Propagation on 23cm's ?

militaryoperator
 

Ben
They may not of heard you on that frequency on 23cm , as most beams are fairly sharp and more
Are now using a dish, to be fair i was working a station to the west after qso beamed South and heard another station in qso, i think most contesters do try to avoid one another on microwave bands. 144 is a another story 
G1PPA 


No G1PPA, rude station was close and S9. 

Still, thats life. 

Ben


Re: Denis G3UVR SK

Graham - G3YJR
 
Edited

I was sad to hear this news. I will miss my chats with him. I remember once mentioning to him that I was stuck on a project for a particular value of zener diode and a couple of days later some diodes arrived in the post from Denis, free of charge.

I didn't know he was a guitarist.

He featured a number of us on his youtube channel.

My condolences to his family. We will miss him.

Graham - G3YJR


Re: What is this Propagation on 23cm's ?

steve G1PPA
 


Ben
They may not of heard you on that frequency on 23cm , as most beams are fairly sharp and more
Are now using a dish, to be fair i was working a station to the west after qso beamed South and heard another station in qso, i think most contesters do try to avoid one another on microwave bands. 144 is a another story 
G1PPA 


Re: What is this Propagation on 23cm's ?

Robin Szemeti - G1YFG
 

Shrug, it never bothers me, I just wait the 20 seconds while they finish and then carry on. 

If there are multiple people calling in, then yes, it is a bit of a pain  but if someone just quickly calls in and exchanges and clears that's fine by me,  the "weak" station is probably losing points/contacts while trying to work me, so the points he picks up from the "breaker" help me as well, as it means he is more likely to continue trying to work me if he can pick up a few along the way.

I agree it might be a bit rude in normal QSO etc, but in a contest, not so much. The other station is of course free to say "break station please stand by", he doesn't have to work him ...   Few things annoy me on the radio these days, I must be mellowing out :)


On Sun, 4 Oct 2020 at 17:15, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Personally, I never mind if I am struggling with a weak one and someone much stronger jumps in, does a quick exchange and clears off.  It takes moments, nothing is lost.  Maybe they had a quick bit of AS or something that opened up for them. Best to take the opportunities as they present themselves, they may not come again.
--------------------------------------------



Not the way I was taught to be a radio amateur. 

If simply walking over everyone is require just to get a few points for a 'contest' that has little meaning in real life then I guess its indicative of the state of the hobby, and some of its participants these days. 

signed:  Ben G4BXD


--
Robin Szemeti - G1YFG


Re: What is this Propagation on 23cm's ?

Pete - GM4BYF
 

Not knowing your location, but 23cm reflects very well from hills. I habitually use local hills for reflection on otherwise obscured paths.

73
Pete GM4BYF
On 04/10/20 15:23, Nick Gregory G0HIK via groups.io wrote:

I went out portable for a few hours today on 23cms, thanks all for the QSO's.

I believe conditions were poor today and around half of my contacts were from A/S I believe.

While out I checked the Stoke Beacon GB3SE, it's a distance of around 150km, it wasn't strong but audible all the time. 
The strange thing swinging the beam over 180 degrees brought it in at roughly the same strength. I checked this occasionally for the 2 1/2 hours I was out and it was the same every time.
I checked the rain radar and no rain clouds were in evidence and I heard no Doppler on it. Everyone else I worked I could beam up on.

What is happening here ?

Thanks Nick G0HIK

--
vry 73
Pete GM4BYF


Re: What is this Propagation on 23cm's ?

militaryoperator
 

Personally, I never mind if I am struggling with a weak one and someone much stronger jumps in, does a quick exchange and clears off.  It takes moments, nothing is lost.  Maybe they had a quick bit of AS or something that opened up for them. Best to take the opportunities as they present themselves, they may not come again.
--------------------------------------------



Not the way I was taught to be a radio amateur. 

If simply walking over everyone is require just to get a few points for a 'contest' that has little meaning in real life then I guess its indicative of the state of the hobby, and some of its participants these days. 

signed:  Ben G4BXD


Re: What is this Propagation on 23cm's ?

Robin Szemeti - G1YFG
 

Personally, I never mind if I am struggling with a weak one and someone much stronger jumps in, does a quick exchange and clears off.  It takes moments, nothing is lost.  Maybe they had a quick bit of AS or something that opened up for them. Best to take the opportunities as they present themselves, they may not come again.


On Sun, 4 Oct 2020 at 16:19, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
I went out portable for a few hours today on 23cms, thanks all for the QSO's.
I believe conditions were poor today and around half of my contacts were from A/S I believe.
While out I checked the Stoke Beacon GB3SE, it's a distance of around 150km, it wasn't strong but audible all the time. 
The strange thing swinging the beam over 180 degrees brought it in at roughly the same strength. I checked this occasionally for the 2 1/2 hours I was out and it was the same every time.
I checked the rain radar and no rain clouds were in evidence and I heard no Doppler on it. Everyone else I worked I could beam up on.
What is happening here ?
Thanks Nick G0HIK
----------------------------------

Thanks for the couple of tries Nick. Sorry we couldn't make it.

Quite poor for me as well. What doesn't help is folk who appear to be logged on to KST but fail to reply when meeped, quite a few, maybe they'd gone for lunch and forgot to disconnect?

Also nice to have folk calling over you when trying to make a weak contact, jumping in and getting their few 'desperate' points, real polite. 

Hey ho. 

I was copying GB3USK solid but no replies to CQ's, there mut be a few south of me. Tried with PE1CKK, could hear him but not him me today. Worked before. 

So, typically, bright sunshine here now. 

Ben G4BXD


--
Robin Szemeti - G1YFG


Re: What is this Propagation on 23cm's ?

Nick Gregory G0HIK
 

Yes KST a blessing and curse. But I don't think I would have made many/any QSO's today without it.

Nick G0HIK


Going for free to a good home ...

Chris Bartram G4DGU
 

If anyone has any General Radio Test equipment, I have sitting on my desk a GR874 to Type N adaptor in new condition and a GR900 to SMC adaptor in used, but fairly good condition for which I'd like to find a good home. I'll donate them to anyone who can give them a good home. I had a collection of GR kit including a couple of slotted lines which, while I was living in West Wales, sadly terminally suffered storage in a stable the roof of which became leaky. These adaptors were in my nice dry workroom/shack.

Please contact me off list if you are interested.

73

Chris G4DGU


Re: What is this Propagation on 23cm's ?

militaryoperator
 

I went out portable for a few hours today on 23cms, thanks all for the QSO's.
I believe conditions were poor today and around half of my contacts were from A/S I believe.
While out I checked the Stoke Beacon GB3SE, it's a distance of around 150km, it wasn't strong but audible all the time. 
The strange thing swinging the beam over 180 degrees brought it in at roughly the same strength. I checked this occasionally for the 2 1/2 hours I was out and it was the same every time.
I checked the rain radar and no rain clouds were in evidence and I heard no Doppler on it. Everyone else I worked I could beam up on.
What is happening here ?
Thanks Nick G0HIK
----------------------------------

Thanks for the couple of tries Nick. Sorry we couldn't make it.

Quite poor for me as well. What doesn't help is folk who appear to be logged on to KST but fail to reply when meeped, quite a few, maybe they'd gone for lunch and forgot to disconnect?

Also nice to have folk calling over you when trying to make a weak contact, jumping in and getting their few 'desperate' points, real polite. 

Hey ho. 

I was copying GB3USK solid but no replies to CQ's, there mut be a few south of me. Tried with PE1CKK, could hear him but not him me today. Worked before. 

So, typically, bright sunshine here now. 

Ben G4BXD


What is this Propagation on 23cm's ?

Nick Gregory G0HIK
 

I went out portable for a few hours today on 23cms, thanks all for the QSO's.

I believe conditions were poor today and around half of my contacts were from A/S I believe.

While out I checked the Stoke Beacon GB3SE, it's a distance of around 150km, it wasn't strong but audible all the time. 
The strange thing swinging the beam over 180 degrees brought it in at roughly the same strength. I checked this occasionally for the 2 1/2 hours I was out and it was the same every time.
I checked the rain radar and no rain clouds were in evidence and I heard no Doppler on it. Everyone else I worked I could beam up on.

What is happening here ?

Thanks Nick G0HIK


Re: 70w 23cm amp build, question.

militaryoperator
 

I bought a slab of ali as well Neil. Seems I'm thiking right, hi. 

I have some 183deg solder I was going to use. I see on bay there is some 138deg type so maybe I should treat myself. 

Ben G4BXD



Subject: Re: [UKMicrowaves] 70w 23cm amp build, question.

I use low-temp Bismuth/Tin solder (Adafruit Makerpaste or Chipquik 138C) to fix power devices so I can change them without melting the Pb/Sn/Ag solder used for the rest of the components. I use a slab of aluminium on my hotplate as a low-pass filter/heat capacitor to give a smooth control of temperature.
Neil G4DBN


Re: 70w 23cm amp build, question.

Neil Smith G4DBN
 

I use low-temp Bismuth/Tin solder (Adafruit Makerpaste or Chipquik 138C) to fix power devices so I can change them without melting the Pb/Sn/Ag solder used for the rest of the components. I use a slab of aluminium on my hotplate as a low-pass filter/heat capacitor to give a smooth control of temperature.

Neil G4DBN

On 04/10/2020 10:25, militaryoperator via groups.io wrote:
Thanks Paul. 

I did suspect that was the case, just a bit unclear but fine now. 

I have bought a hotplate so will mount all the components first, hotplate it, then attach the fet and spreader. and try and keep the other components away from plate while soldering them. 



Re: 70w 23cm amp build, question.

militaryoperator
 

Thanks Paul. 

I did suspect that was the case, just a bit unclear but fine now. 

I have bought a hotplate so will mount all the components first, hotplate it, then attach the fet and spreader. and try and keep the other components away from plate while soldering them. 

cheers, Ben.



Subject: Re: [UKMicrowaves] 70w 23cm amp build, question.

I have two of these to assemble and as I understand it first job is temporary clamp the copper piece tight against the PCB so the copper, the FET and the board can be soldered together with low melting point solder.

The suggested method is put M3 threads in the copper and use M3 stainless screws for temporary clamping (stainless, so they won't take solder, and can be removed after soldering).

For final assembly, you must clamp the PCB with attached copper piece tight to the heatsink. A warning is given against using large screws (M3) for final assembly because the big screw heads reduce clearance to the RF "hot" matching lines on the PCB. Recommendation for final assembly is M2.5.

So, the heatsink must be tapped M2.5 to accept final assembly M2.5 clamping screws passed thru the PCB and copper. The M3 threads in the copper are no longer used because the M2.5 clamping screws pass thru and only engage with the tapped heatsink.

Or .....you could drill clearance holes for M2.5 (thru PCB and copper) and use M2.5 stainless screws, nuts and washers to hold everything together for soldering, then discard the nuts and washers for final assembly using the M2.5 screws into the tapped holes in the heatsink (avoids need for M3 drill & tap and hardware).

Or ... you could drill and tap the copper piece M2.5, holding together with M2.5 screws for soldering then just drill out the threads in the copper using M2.5 clearance drill for final assembly using the M2.5 screws into the tapped holes in the heatsink (avoids need for M3 drill & tap, M3 hardware and M2.5 nuts).
 
That's my understanding, I hope this post clarifies with options.

See you on AO100!
Paul




From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of a a via groups.io <celad2001@...>
Sent: 30 September 2020 20:10
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 70w 23cm amp build, question.
 
i think the copper tapped to 2.5 was to secure the spreader while the fet is soldered,
Then the holes opened to 3mm to take bolts to compression fit the board and copper spreader to the heatsink, it would not be possible to get the spreader compressed to the heatsink with threads in the copper,
de alec
On Wednesday, 30 September 2020, 18:29:49 BST, militaryoperator via groups.io <military1944@...> wrote:


A bit unclear. 

Notes on fitting the heat spreader to the G4BAO/G7NTG 70 watt PA
It says:

The centre holes in the PCB should be opened out to 3mm and secured to the heat spreader with a smear of solder paste in between them with two short M3 stainless steel screws 

then says:

The screws are then removed and then the pcb can be fixed to the heatdink with 2 x m2.5mm screws.

If I have tapped two 3mm holes how can 2.5mm bolts fit?


Ben


Re: 70w 23cm amp build, question.

Paul Randall G3NJV
 

I have two of these to assemble and as I understand it first job is temporary clamp the copper piece tight against the PCB so the copper, the FET and the board can be soldered together with low melting point solder.

The suggested method is put M3 threads in the copper and use M3 stainless screws for temporary clamping (stainless, so they won't take solder, and can be removed after soldering).

For final assembly, you must clamp the PCB with attached copper piece tight to the heatsink. A warning is given against using large screws (M3) for final assembly because the big screw heads reduce clearance to the RF "hot" matching lines on the PCB. Recommendation for final assembly is M2.5.

So, the heatsink must be tapped M2.5 to accept final assembly M2.5 clamping screws passed thru the PCB and copper. The M3 threads in the copper are no longer used because the M2.5 clamping screws pass thru and only engage with the tapped heatsink.

Or .....you could drill clearance holes for M2.5 (thru PCB and copper) and use M2.5 stainless screws, nuts and washers to hold everything together for soldering, then discard the nuts and washers for final assembly using the M2.5 screws into the tapped holes in the heatsink (avoids need for M3 drill & tap and hardware).

Or ... you could drill and tap the copper piece M2.5, holding together with M2.5 screws for soldering then just drill out the threads in the copper using M2.5 clearance drill for final assembly using the M2.5 screws into the tapped holes in the heatsink (avoids need for M3 drill & tap, M3 hardware and M2.5 nuts).
 
That's my understanding, I hope this post clarifies with options.

See you on AO100!
Paul




From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of a a via groups.io <celad2001@...>
Sent: 30 September 2020 20:10
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 70w 23cm amp build, question.
 
i think the copper tapped to 2.5 was to secure the spreader while the fet is soldered,
Then the holes opened to 3mm to take bolts to compression fit the board and copper spreader to the heatsink, it would not be possible to get the spreader compressed to the heatsink with threads in the copper,
de alec
On Wednesday, 30 September 2020, 18:29:49 BST, militaryoperator via groups.io <military1944@...> wrote:


A bit unclear. 

Notes on fitting the heat spreader to the G4BAO/G7NTG 70 watt PA
It says:

The centre holes in the PCB should be opened out to 3mm and secured to the heat spreader with a smear of solder paste in between them with two short M3 stainless steel screws 

then says:

The screws are then removed and then the pcb can be fixed to the heatdink with 2 x m2.5mm screws.

If I have tapped two 3mm holes how can 2.5mm bolts fit?


Ben

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