Date   

Re: miller lathe?

ian hope (2E0IJH)
 

Often use Axminster for tools as they have a shop locally near Sheppey, https://www.axminstertools.com/stores
 
Very handy
 
Ian
M5IJH

 
 
Sent: Saturday, June 12, 2021 at 8:21 PM
From: "militaryoperator via groups.io" <Military1944@...>
To: "UKMicrowaves@groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] miller lathe?
Hi Ben,
Cheaper from
https://www.rapidonline.com/Sealey-SM2503-Mini-Lathe-and-Drilling-Machine-89-2770?utm_source=AffWin&utm_medium=Affiliate&awc=1799_1623524046_6555171c12b59b611f70f66727baeb83.
These cheap tools are often best bought from Axminster. They do good quality control.
https://www.axminstertools.com/
Much better to get a more robust machine secondhand. Getting good results is easier with a more rigid machine. You will be very limited with a machine of this sort. Don't expect to do milling with it unless you can replace the drill chuck with some sort of collet chuck.
Rule of thumb. Expect to spend as much or more on tooling.
I have a small lathe which I never use. The big one ( a Colchester Student) is more accurate and easier to use.
Ring me if you want a chat on the subject.
73
Paul G8AQA
 
Thanks Paul. I hear what you say and do appreciate you only get what you pay for but as its really only drilling small holes accurately and facing off waveguide etc, not milling out solid blocks for high power amplifiers and the like I thought something like this might be handier than a battery hand drill and a Dremel.
 
Yes, a local pickup of a much better spec item would be great, just a matter of being in the right place at the right time, hi. 
 
cheers, Ben 
 


Re: miller lathe?

Mark GM4ISM
 

This is almost a clone of my Axminster micro lathe. I have a 2 axis slide attachment  as well  that allows  milling  using the main lathe chuck. I get good results on small projects.

If you understand it's limitations  and don't try to cut  too deep, you can do a good job on smaller pieces. You have to be prepared to take your time to achieve this. I have used much bigger and more robust machines and they sure make life easier.  I don't have room for that sort of machine but couldn't do without my trusty little Axminster machine. If you need to machine anything of any size, these machines are of little use

Mine was bought second hand and cost a LOT less that £1600

Mark GM4ISM


On 12/06/2021 20:21, militaryoperator via groups.io wrote:
Hi Ben,
Cheaper from
https://www.rapidonline.com/Sealey-SM2503-Mini-Lathe-and-Drilling-Machine-89-2770?utm_source=AffWin&utm_medium=Affiliate&awc=1799_1623524046_6555171c12b59b611f70f66727baeb83.
These cheap tools are often best bought from Axminster. They do good quality control.
https://www.axminstertools.com/
Much better to get a more robust machine secondhand. Getting good results is easier with a more rigid machine. You will be very limited with a machine of this sort. Don't expect to do milling with it unless you can replace the drill chuck with some sort of collet chuck.
Rule of thumb. Expect to spend as much or more on tooling.
I have a small lathe which I never use. The big one ( a Colchester Student) is more accurate and easier to use.
Ring me if you want a chat on the subject.
73
Paul G8AQA

Thanks Paul. I hear what you say and do appreciate you only get what you pay for but as its really only drilling small holes accurately and facing off waveguide etc, not milling out solid blocks for high power amplifiers and the like I thought something like this might be handier than a battery hand drill and a Dremel.

Yes, a local pickup of a much better spec item would be great, just a matter of being in the right place at the right time, hi. 

cheers, Ben 

Virus-free. www.avg.com


Re: miller lathe?

militaryoperator
 

Hi Ben,
Cheaper from
https://www.rapidonline.com/Sealey-SM2503-Mini-Lathe-and-Drilling-Machine-89-2770?utm_source=AffWin&utm_medium=Affiliate&awc=1799_1623524046_6555171c12b59b611f70f66727baeb83.
These cheap tools are often best bought from Axminster. They do good quality control.
https://www.axminstertools.com/
Much better to get a more robust machine secondhand. Getting good results is easier with a more rigid machine. You will be very limited with a machine of this sort. Don't expect to do milling with it unless you can replace the drill chuck with some sort of collet chuck.
Rule of thumb. Expect to spend as much or more on tooling.
I have a small lathe which I never use. The big one ( a Colchester Student) is more accurate and easier to use.
Ring me if you want a chat on the subject.
73
Paul G8AQA

Thanks Paul. I hear what you say and do appreciate you only get what you pay for but as its really only drilling small holes accurately and facing off waveguide etc, not milling out solid blocks for high power amplifiers and the like I thought something like this might be handier than a battery hand drill and a Dremel.

Yes, a local pickup of a much better spec item would be great, just a matter of being in the right place at the right time, hi. 

cheers, Ben 


Re: miller lathe?

Paul G8AQA
 

Hi Ben,

Cheaper from
https://www.rapidonline.com/Sealey-SM2503-Mini-Lathe-and-Drilling-Machine-89-2770?utm_source=AffWin&utm_medium=Affiliate&awc=1799_1623524046_6555171c12b59b611f70f66727baeb83.

These cheap tools are often best bought from Axminster. They do good quality control.
https://www.axminstertools.com/

Much better to get a more robust machine secondhand. Getting good results is easier with a more rigid machine. You will be very limited with a machine of this sort. Don't expect to do milling with it unless you can replace the drill chuck with some sort of collet chuck.

Rule of thumb. Expect to spend as much or more on tooling.

I have a small lathe which I never use. The big one ( a Colchester Student) is more accurate and easier to use.

Ring me if you want a chat on the subject.

73
Paul G8AQA

On 12/06/2021 19:47, militaryoperator via groups.io wrote:
SEALEY SM2503


Virus-free. www.avg.com


miller lathe?

militaryoperator
 

Having too much time and such I was thinking of a little miller/drill/lathe. 

Saw this:  SEALEY SM2503

Has by any chance anyone got one, knows if its worth the £1600 or so?

Ben

... Yes, I know its not CNC, not everything needs to be connected to a pc.


Re: 9cm filter?

Michael Scott
 

OK Ben. I just checked, Minikits no longer do the 9cm filter, and they no longer ship to the UK as it is too much trouble since Brexit!

I dug out mine so it is there if you need it.

73, Mike.


On 12/06/2021 09:36, militaryoperator via groups.io wrote:
Hi Mike. 

Thanks for your kind offer. I'll just do some tests as Neil suggests first with attenuators and such, see if I can determine what the noise is, and then I'll get back to you.

cheers, Ben. 



Subject: Re: [UKMicrowaves] 9cm filter?

Hi Ben
Minikits in Australia do, or did do, a pcb 9cm filter.
I second what others have said about pipe cap filters, Paul Wade used them in his Rover transverter. Details are on his website ( Google W1GHZ ). I made an interdigital filter for 9 cms which worked well, but it involves quite a bit of machining. I could lend it to you to see if it solves your problem before you go to the trouble of buying or making anything. I could also lend you the Minikits one as well but it won't be as good as the  interdigital one.
73, Mike G3LYP


Re: Sun and Mood predictions - backwards

Andy G4JNT
 

Nice bit of software!
Or should I say, website.



On Sat, 12 Jun 2021 at 12:55, Bob_G1ZJP <R_Offer@...> wrote:

Andy

 

You might make use of TPE – The Photographer’s Ephemeris - Photo Ephemeris (photoephemeris.com)

 

73

Bob, G1ZJP

 

 

 

 

From: Andy G4JNT
Sent: 12 June 2021 12:37
To: UK Microwaves groups.io
Subject: [UKMicrowaves] Sun and Mood predictions - backwards

 

There's plenty of software to show where the Sun and Moon are at any given date and time.

But what software is there that will give the date and time they fall at a specific location in the sky ?

 

I believe, from comments heard once, that the photographic community may have something, for setting up landscape shots. 

 

Otherwise its a case of get out the old John Morris GM4ANB code and writing a search routine around it.  

 

Andy

 

 


Re: Sun and Mood predictions - backwards

Bob_G1ZJP
 

Andy

 

You might make use of TPE – The Photographer’s Ephemeris - Photo Ephemeris (photoephemeris.com)

 

73

Bob, G1ZJP

 

 

 

 

From: Andy G4JNT
Sent: 12 June 2021 12:37
To: UK Microwaves groups.io
Subject: [UKMicrowaves] Sun and Mood predictions - backwards

 

There's plenty of software to show where the Sun and Moon are at any given date and time.

But what software is there that will give the date and time they fall at a specific location in the sky ?

 

I believe, from comments heard once, that the photographic community may have something, for setting up landscape shots. 

 

Otherwise its a case of get out the old John Morris GM4ANB code and writing a search routine around it.  

 

Andy

 

 


Sun and Mood predictions - backwards

Andy G4JNT
 

There's plenty of software to show where the Sun and Moon are at any given date and time.
But what software is there that will give the date and time they fall at a specific location in the sky ?

I believe, from comments heard once, that the photographic community may have something, for setting up landscape shots. 

Otherwise its a case of get out the old John Morris GM4ANB code and writing a search routine around it.  


Re: 9cm filter?

Alan Beard
 

Hi all,

Similar problem here with a HackRF, noise from a mobile phone tower about 600m away.
Hil VK2AZ, is directly behind the phone tower, about 6km away.

I found an article, Evanescent Waveguide Filters, QEX  Mar 2010, Paul Wade W1GHZ

I built one for 3.4GHz and it 'did the trick'. You can see the Web SDR at:
http://www.<my email domain>:8073

I did have to 'tune' the 2.4GHz one I built by drilling right  through the waveguide
and soldering wires across, forming an iris between the two tuned sections.

The NanoVNA SAAv2 is a magic bit of test gear to make these filters.
And the PocketVNA beforehand.

Alan VK2ZIW

On Sat, 12 Jun 2021 08:36:39 +0000 (UTC), militaryoperator via groups.io wrote
> Hi Mike. 
>
> Thanks for your kind offer. I'll just do some tests as Neil suggests first with attenuators and such, see if I can determine what the noise is, and then I'll get back to you.
>
> cheers, Ben. 
>
>
> Subject: Re: [UKMicrowaves] 9cm filter?
>
> Hi Ben
> Minikits in Australia do, or did do, a pcb 9cm filter.
> I second what others have said about pipe cap filters, Paul Wade used them in his Rover transverter. Details are on his website ( Google W1GHZ ). I made an interdigital filter for 9 cms which worked well, but it involves quite a bit of machining. I could lend it to you to see if it solves your problem before you go to the trouble of buying or making anything. I could also lend you the Minikits one as well but it won't be as good as the  interdigital one.
> 73, Mike G3LYP
>
>

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


Re: 10GHz EME

Andy G4JNT
 

On 1 July at 0330 (In the Southern UK) the Moon will be within 2 - 3 degrees of QO-100   at Az 146° / El 26°
There may well be other dates/times, but that's the first one I found.


°


On Sat, 12 Jun 2021 at 09:59, Andy Talbot <andy.g4jnt@...> wrote:
At some point in the year the Az/El on the Moon will be exactly the same as QO-100.  SO  all those stations set up for the satellite will have a chance, for a few minutes, of decoding the DL0SHF beacon.   
Now to find some Moon ephemeris software that allows that sort of back-calculation



On Sat, 12 Jun 2021 at 09:54, John Fell <john.g0api@...> wrote:
Thanks for the help with the Q65 yesterday - guess you were in Winchester ?

There was a single decode at -3dB during the short session looking at DL0SHF .

The dish is actually 12Ft diameter (3.657m ?) .

I have decoded DL0SHF several times at -20 dB ish in the past few years using my normal 60cm offset Tropo system using QRA6.. and MK1 eyeball , so anyone with similar size elevateable dish using Q65 should be able to get decodes - this was most probably at optimum pathloss phases , so the new mode needs testing here at home .

Julian has the notes of tests , so will pass these along when written up .

73
John
G0API

On Fri, 11 Jun 2021 at 18:01, Andy G4JNT <andy.g4jnt@...> wrote:
If you're getting -4dB S/N reports with a 3.2m dish, then it would be around -18dB  with a 0.6m dish - which we all have.
Still with 4 - 5dB in hand to allow for indifferent feeder losses.



On Fri, 11 Jun 2021 at 17:32, John Fell <john.g0api@...> wrote:
G4RFR is currently testing off the Moon on 10368.050MHz using Q65E - 60S.
CFOM is in use .
Any calls welcome , in any mode -CW/SSB /digital.
If you hear the signal we would appreciate any SWL reports .
Although at Apogee the return echoes are good , low spreading .
Taking -4dB reports from DL0SHF .

73
John
G0API
G4RFR EME Group


Re: 10GHz EME

Andy G4JNT
 

At some point in the year the Az/El on the Moon will be exactly the same as QO-100.  SO  all those stations set up for the satellite will have a chance, for a few minutes, of decoding the DL0SHF beacon.   
Now to find some Moon ephemeris software that allows that sort of back-calculation



On Sat, 12 Jun 2021 at 09:54, John Fell <john.g0api@...> wrote:
Thanks for the help with the Q65 yesterday - guess you were in Winchester ?

There was a single decode at -3dB during the short session looking at DL0SHF .

The dish is actually 12Ft diameter (3.657m ?) .

I have decoded DL0SHF several times at -20 dB ish in the past few years using my normal 60cm offset Tropo system using QRA6.. and MK1 eyeball , so anyone with similar size elevateable dish using Q65 should be able to get decodes - this was most probably at optimum pathloss phases , so the new mode needs testing here at home .

Julian has the notes of tests , so will pass these along when written up .

73
John
G0API

On Fri, 11 Jun 2021 at 18:01, Andy G4JNT <andy.g4jnt@...> wrote:
If you're getting -4dB S/N reports with a 3.2m dish, then it would be around -18dB  with a 0.6m dish - which we all have.
Still with 4 - 5dB in hand to allow for indifferent feeder losses.



On Fri, 11 Jun 2021 at 17:32, John Fell <john.g0api@...> wrote:
G4RFR is currently testing off the Moon on 10368.050MHz using Q65E - 60S.
CFOM is in use .
Any calls welcome , in any mode -CW/SSB /digital.
If you hear the signal we would appreciate any SWL reports .
Although at Apogee the return echoes are good , low spreading .
Taking -4dB reports from DL0SHF .

73
John
G0API
G4RFR EME Group


Re: 10GHz EME

John Fell
 

Thanks for the help with the Q65 yesterday - guess you were in Winchester ?

There was a single decode at -3dB during the short session looking at DL0SHF .

The dish is actually 12Ft diameter (3.657m ?) .

I have decoded DL0SHF several times at -20 dB ish in the past few years using my normal 60cm offset Tropo system using QRA6.. and MK1 eyeball , so anyone with similar size elevateable dish using Q65 should be able to get decodes - this was most probably at optimum pathloss phases , so the new mode needs testing here at home .

Julian has the notes of tests , so will pass these along when written up .

73
John
G0API

On Fri, 11 Jun 2021 at 18:01, Andy G4JNT <andy.g4jnt@...> wrote:
If you're getting -4dB S/N reports with a 3.2m dish, then it would be around -18dB  with a 0.6m dish - which we all have.
Still with 4 - 5dB in hand to allow for indifferent feeder losses.



On Fri, 11 Jun 2021 at 17:32, John Fell <john.g0api@...> wrote:
G4RFR is currently testing off the Moon on 10368.050MHz using Q65E - 60S.
CFOM is in use .
Any calls welcome , in any mode -CW/SSB /digital.
If you hear the signal we would appreciate any SWL reports .
Although at Apogee the return echoes are good , low spreading .
Taking -4dB reports from DL0SHF .

73
John
G0API
G4RFR EME Group


Re: 9cm filter?

militaryoperator
 

Hi Mike. 

Thanks for your kind offer. I'll just do some tests as Neil suggests first with attenuators and such, see if I can determine what the noise is, and then I'll get back to you.

cheers, Ben. 



Subject: Re: [UKMicrowaves] 9cm filter?

Hi Ben
Minikits in Australia do, or did do, a pcb 9cm filter.
I second what others have said about pipe cap filters, Paul Wade used them in his Rover transverter. Details are on his website ( Google W1GHZ ). I made an interdigital filter for 9 cms which worked well, but it involves quite a bit of machining. I could lend it to you to see if it solves your problem before you go to the trouble of buying or making anything. I could also lend you the Minikits one as well but it won't be as good as the  interdigital one.
73, Mike G3LYP


Re: Rotator problem

F1CHF
 

I see this article (use a 10 turns 5 k potentiometer)
500 ohms 360 degres seems hard to find ..
 
see here
 
 
francois F1CHF
 


RSGB VHF book

 

I have an old white covered hardcover copy of the RSGB VHF manual and it’s getting worn out.  

How does the new version compare? I am thinking of picking up a new copy. 

Thanks
Dave
VE7HR


Re: CGHV59070F 6cm HEMT arrived

Neil Smith G4DBN
 

I said something like "for my personal use only, for amateur radio experimentation". Usually I get the form almost immediately, but this time it took almost three weeks after answering the initial statement. The declaration form was the same as the one for the big 10 GHz GaN MMICs.

Neil G4DBN

On 11/06/2021 23:02, Andy G4JNT wrote:
Warning, when filling in end user forms like that, don't say 'educational'.  That get's them worried; as to who is being educated?
When  I was picked up on this (by a phone call from someone at MiniCircuits), I was told to change it to amateur radio and it would go through straightaway with no hassle.  It did.
I wonder how colleges manage.


Re: CGHV59070F 6cm HEMT arrived

Andy G4JNT
 

Warning, when filling in end user forms like that, don't say 'educational'.  That get's them worried; as to who is being educated?
When  I was picked up on this (by a phone call from someone at MiniCircuits), I was told to change it to amateur radio and it would go through straightaway with no hassle.  It did.
I wonder how colleges manage.




On Fri, 11 Jun 2021 at 22:45, Neil Smith G4DBN <neil@...> wrote:
Much cheaper than the 10 GHz 42 watt MMICs!

£253 each including VAT. Yes, just had to explain the end use and
promise not to send them overseas.

Neil

On 11/06/2021 20:16, Dave G6HEF wrote:
>
> Go on, how much did they cost and what were the EAR regulations? Is
> that to do with promising not to use them for military and that sort
> of thing?
>







Re: CGHV59070F 6cm HEMT arrived

Neil Smith G4DBN
 

Much cheaper than the 10 GHz 42 watt MMICs!

£253 each including VAT. Yes, just had to explain the end use and promise not to send them overseas.

Neil

On 11/06/2021 20:16, Dave G6HEF wrote:

Go on, how much did they cost and what were the EAR regulations? Is that to do with promising not to use them for military and that sort of thing?


Re: Rotator problem

ian hope (2E0IJH)
 

Peter's about the only person that has bits for G400/G600's the diawa 7500 uses the same casing, so likely very similar inside
 
Ian
M5IJH

 
 
Sent: Friday, June 11, 2021 at 7:58 PM
From: "Nick Peckett G4KUX" <nick@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Rotator problem

Try Duoro Services in VK land, he specalises in Rotator refurbisment and knows a lot about the Daiwa product, he may well have a spare pot. www.kur02.com.au He supplied me with some spares for a Diawa Multitorque roror I was refubishing. Not the cheapest but quite helpful.

Regards

Nick G4KUX

On 11/06/2021 15:23, g4zod@... via groups.io wrote:
I have acquired a second hand Daiwa 7500 A rotator. ( The one on my mast is dying after nearly 30+ years of use)
The replacement rotator seems to have an intermittent rotary potentiometer in the head unit. It seems to be a 360 degree device. (500K?) I did a search on the web but it seems they may be " specials" and not available.
Can anybody  advise me to where   could  a replacement.
It would be a shame to dump this rotator which is much better than my existing one.
Many thanks.
Julian
G4ZOD
 
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