Date   

Re: What Moon/Sun tracking software is being used.

Paul G8AQA
 

These might be worth a look.  We are using them on a 24" telescope.

https://www.cuidevices.com/product/motion/rotary-encoders/absolute/modular/amt21-v-kit

Paul G8AQA

On 14/05/2020 02:28, Alan Beard wrote:
Hi guys,

I'd ask of the software: What accuracy does it support?

23cm, 5m dish, required pointing accuracy: 0.5 deg.

The John Drew VK5DJ controller  as designed for VK3UM, as I recall, 
does 0.01 deg. in his software.

One's biggest problem is the position accuracy in the rotator.
My KR-400 could be up to 20 deg. out. Readily available absolute shaft encodes
do 1024 steps per rotation. 1024 / 360 => 0.3 deg. resolution. 

BTW: I've asked the "hamlib" developers to consider this and they have improved
the available accuracy in the "hamlib" library.

80                    (A problem solver, have AC, need DC)

Alan VK2ZIW


On Wed, 13 May 2020 12:25:03 -0700, Nick Gregory G0HIK via groups.io wrote
> Thanks guys,
>
> I'll look at both of those and MoonSked and will report back how I get on, pretty sure I tried WXTrack in the past at some time.
>
> Nick G0HIK

---------------------------------------------------
Alan Beard

OpenWebMail 2.53



Re: 122 GHz Chips - UK group purchase ?

Dave G8KHU
 

Good morning all

Just a reminder to anyone who's interested and hasn't yet contacted me. I'm putting in an order to Silicon Radar for the 122 GHz and 24 GHz radar chips, TRA_120_002 and TRX_024_006 respectively, with the aim of reducing their per order carriage and handling charges to an affordable level. So far I have confirmed orders for 23 of the 120 GHz chips and 16 of the 24 GHz devices which has brought the Silicon Radar handling charge down to around £2.67 per chip.

So currently the cost per chip is £ 27.26 for the 122 GHz device and £ 14.17 for the 24 GHz device - these prices include the amortised handling charge contribution. Postage within the UK is gratis.

If anyone else would like to join in the purchase then plaese let me know by Sunday mid-day (17th May) so I can close off the list and get tghe order placed next week. The devices are ex-stock Germany and they are quoting 6-7 days delivery from receipt of payment.

73
Dave G8KHU


Re: What Moon/Sun tracking software is being used.

Alan Beard
 

Hi guys,

I'd ask of the software: What accuracy does it support?

23cm, 5m dish, required pointing accuracy: 0.5 deg.

The John Drew VK5DJ controller  as designed for VK3UM, as I recall, 
does 0.01 deg. in his software.

One's biggest problem is the position accuracy in the rotator.
My KR-400 could be up to 20 deg. out. Readily available absolute shaft encodes
do 1024 steps per rotation. 1024 / 360 => 0.3 deg. resolution. 

BTW: I've asked the "hamlib" developers to consider this and they have improved
the available accuracy in the "hamlib" library.

80                    (A problem solver, have AC, need DC)

Alan VK2ZIW


On Wed, 13 May 2020 12:25:03 -0700, Nick Gregory G0HIK via groups.io wrote
> Thanks guys,
>
> I'll look at both of those and MoonSked and will report back how I get on, pretty sure I tried WXTrack in the past at some time.
>
> Nick G0HIK

---------------------------------------------------
Alan Beard

OpenWebMail 2.53


Re: Water cooling question

Lou Blasco
 

On Thu, May 14, 2020 at 02:10 AM, militaryoperator wrote (in part):

Hi Ben,

Perhaps you were just having a laugh but in case you weren't, I've seen what you've done with your museum and that shows determination which is just what's required above 1000MHz. There's always going to be a station you can't reach or out do. Perhaps a better way to go about it is to challenge yourself and try to better your previous achievements. I've found that to be a goal that leads to great satisfaction rather than frustration. Just Sayin'


Guess its time to throw it all in the skip and stop wasting
time, mine and the station who can't hear me......

Ben


--
Regards

Lou
VK3ALB


Re: Water cooling question

Chris Ruddy MM0KOS
 

Hi Ben

 

Plenty of 2M stations will tell you I spent months shouting CQ night after night with no reply under an MM3 call, im sure folk heard me and didn’t reply. I went to the MM0 call and upped the power to 100w, it was at the time of the infancy of JT44 (I feel old lol). I worked for every QSO I had on SSB, MS,ES and EME. Thats my story back then, I gave up radio for 8 years but im back at it, 23cms is nearly there, home brew transverter, homebrew beams, 2x 41 element (1 built today) but will be 4, homebrew amplifier solid state. 13cm, homebrew transverter, homebrew beams 4x 41 ( 2 built) and im sure the amp will be mostly homebrew aswell. 9Cm 1.8m dish and a half built transverter that im struggling with a wee bit but ill get to it soon and a septum for the feed. Dont give up!!! Every day and every QSO can be hard on the VHF and up, we aint on HF where fishing is easyish. Youve came this far and I know times can be hard with no CNDX etc but hey you’ve got this far, don’t turn back now!!!

 

On the subject of water storage im sure my old copper water tank will be having a new life soon as we dont use it now a days but I will be lining it with some sort of apoxy or something after a bit of research to see whats best to stop the corrosion.

 

Chris MM0KOS

 

Sent from Mail for Windows 10

 

From: militaryoperator via groups.io
Sent: 13 May 2020 17:10
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Water cooling question

 

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump.



-- ----------------

OMG........ water cooled pa's.............. strikes me that with my dismally pathetic 25watt no matter how well 'I' hear this BIG signal 
the same will not happen in reverse. 
Guess its time to throw it all in the skip and stop wasting time, mine and the station who can't hear me...... 

Pity the pubs are shut. Hey ho. 

Ben


 


Re: Water cooling question

Robin Szemeti - G1YFG
 

I think extra credits should be given in contests to people using water cooled valves :) ... it is such a big effort to make for the power.  I actually found my watercooled  PA stage in a box this week, where it was put for storage 25 years ago ... I don't think I will rebuild it, there is no PSU .. these days it is easier to build a big LDMOS PA .. but there is some good fun to be had building a water cooled PA, even if only for the excitement of trying not to die from the electricity!


On Wed, 13 May 2020 at 18:37, Conrad, PA5Y <g0ruz@...> wrote:

Ben don’t be daft! It’s a journey, it takes years to get there and that is the fun of it. Besides it could be argued that low power operation is equally satisfying, it’s just different. I am trying to work people over 400-600kms away when I do the UKACs. Or EME. In both cases the ERP is necessary, on EME to overcome the path loss and during the UKAC to overcome splatter from UK based stations. It does not always work but I like to try,

 

In every contest I work guys running 10W @ 500kms distance, not easily but I don’t give up.

 

If I had loads of money I would not be using a surplus TV transmitter amplifier that needs water-cooling.  That is seen as a barrier by most and so the price was low. It took me a while to get it going and I am still learning. Last night was good because nobody was answering me and 4.5hrs of almost constant CQs proved that it is quite reliable at least.

 

Regards

 

Conrad PA5Y

 

 

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of militaryoperator via groups.io
Sent: 13 May 2020 18:10
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Water cooling question

 

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump.



-- ----------------

OMG........ water cooled pa's.............. strikes me that with my dismally pathetic 25watt no matter how well 'I' hear this BIG signal 
the same will not happen in reverse. 
Guess its time to throw it all in the skip and stop wasting time, mine and the station who can't hear me...... 

Pity the pubs are shut. Hey ho. 

Ben




--
Best regards,

Robin Szemeti

Redpoint Consulting Limited

E: robin@...
T: +44 (0) 1299 405028
M: +44 (0) 7971 883371

CONFIDENTIALITY NOTICE
The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the
intended recipient or person responsible for delivering it to the
intended recipient, you have received this communication in error
and must not distribute or copy it.
Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication.

Thank you.


Re: Water cooling question

Wilko
 

That resin is called an "ion exchanger" (<-- that is translated from the word for it). Yellow / brownish I remember. Once saturated it can be reconditioned using diluted HCl.

(mind you, approx 40'years ago I used this stuff, memory rot might have set in)

Wilko
PA1WBU


Re: What Moon/Sun tracking software is being used.

Nick Gregory G0HIK
 

Thanks guys,

I'll look at both of those and MoonSked and will report back how I get on, pretty sure I tried WXTrack in the past at some time.

Nick G0HIK


Re: Water cooling question

Conrad, PA5Y
 

I have a 120l barrel but actually it would be a nuisance. The room is adjacent to the shack so I don’t worry about blowers and the such like but at no point did I say that I had plenty of space. Its 3 x 4 x 2.4m and of course you forgot to allow for the ‘junk factor’. It’s a space so I already filled it!

 

It sounds much grander than it is although it does have airco 😉

 

73

 

Conrad PA5Y

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Ian White via groups.io
Sent: 13 May 2020 16:53
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Water cooling question

 

As others have said, it's difficult to remove heat from a coolant that is barely above room temperature itself. On the other hand, it's very easy to increase the total mass of water and continue to use passive cooling.


Changing to a full-size 110 litre dustbin would reduce the temperature rise by a factor of 2 and increase the surface area for passive cooling by a factor closer to 4. Next step in that direction would be a 240 litre wheelie bin. It sounds like you have space enough for that.

 

Another data-point from the 2C39 days is that K2UYH used to operate a water cooled ring of 8 for a whole EME weekend using a large bin with no other cooling.

 

73 from Ian GM3SEK

 

 

On 13/05/2020 10:03, Conrad, PA5Y wrote:

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 

 

I have no idea how much heat such a radiator with a fan would take out of the water.

 

73

 

Conrad PA5Y


Re: Water cooling question

Conrad, PA5Y
 

Ben don’t be daft! It’s a journey, it takes years to get there and that is the fun of it. Besides it could be argued that low power operation is equally satisfying, it’s just different. I am trying to work people over 400-600kms away when I do the UKACs. Or EME. In both cases the ERP is necessary, on EME to overcome the path loss and during the UKAC to overcome splatter from UK based stations. It does not always work but I like to try,

 

In every contest I work guys running 10W @ 500kms distance, not easily but I don’t give up.

 

If I had loads of money I would not be using a surplus TV transmitter amplifier that needs water-cooling.  That is seen as a barrier by most and so the price was low. It took me a while to get it going and I am still learning. Last night was good because nobody was answering me and 4.5hrs of almost constant CQs proved that it is quite reliable at least.

 

Regards

 

Conrad PA5Y

 

 

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of militaryoperator via groups.io
Sent: 13 May 2020 18:10
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Water cooling question

 

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump.



-- ----------------

OMG........ water cooled pa's.............. strikes me that with my dismally pathetic 25watt no matter how well 'I' hear this BIG signal 
the same will not happen in reverse. 
Guess its time to throw it all in the skip and stop wasting time, mine and the station who can't hear me...... 

Pity the pubs are shut. Hey ho. 

Ben



Re: Water cooling question

ian hope (2E0IJH)
 

One of my customers is a specialist Filter company that suppies DI resin and can supply or make up a cartridge and housing with DI resin, https://www.fileder.co.uk/products/spectrum-general-purpose-di-resin/, They have a inhouse small scale production workshop and will make one offs
 
ian
2E0IJH

 
 
Sent: Wednesday, May 13, 2020 at 4:49 PM
From: "Robin Szemeti" <robin@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Water cooling question
There is a resin used for producing DI water, you just stick it in a length of tube with a bit of gauze at each end ... tap water in, DI out.  When I ran large industrial lasers, the cooling systems had a DI pack of this stuff in circuit. It kept conductivity well below around 20 uSiemens ... perfect for any high voltage use.
 
 
On Wed, 13 May 2020 at 16:30, Stephen Tompsett <stephen@...> wrote:

What about using one of the radiators designed for water cooling computers? I think that a moderate size radiator/fan can can provide a cooling capacity of 200-400W for a 10 degree temperature difference from ambient when used with an appropriate fan.

 

On 13/05/2020 10:03, Conrad, PA5Y wrote:
Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 
 
I have no idea how much heat such a radiator with a fan would take out of the water.
 
73
 
Conrad PA5Y
--
Stephen Tompsett (G8LYB)
Tel: 01788 578940
Mob: 07956 855816

 

 



--
Best regards,

Robin Szemeti

Redpoint Consulting Limited

E: robin@...
T: +44 (0) 1299 405028
M: +44 (0) 7971 883371

CONFIDENTIALITY NOTICE
The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the
intended recipient or person responsible for delivering it to the
intended recipient, you have received this communication in error
and must not distribute or copy it.
Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication.

Thank you. 


Re: Water cooling question

militaryoperator
 

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump.


-- ----------------
OMG........ water cooled pa's.............. strikes me that with my dismally pathetic 25watt no matter how well 'I' hear this BIG signal 
the same will not happen in reverse. 
Guess its time to throw it all in the skip and stop wasting time, mine and the station who can't hear me...... 
Pity the pubs are shut. Hey ho. 
Ben


Re: Water cooling question

Conrad, PA5Y
 

Yes but this is an SSPA so high voltage is not an issue, my concern is corrosion so I used distilled water and added some car radiator fluid. It has very similar ingredients to the additive recommended by R&S. The mixture is 10% additive 90% distilled water.

I'll stick a thermometer in it next contest and see how much it actually increases. I'm just scared by 'lukewarm' because I have not done used watercooling since the late 80s when I also had 2 x 2C39 and a little fish tank. That worked OK

Regards

Conrad


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Robin Szemeti via groups.io <robin@...>
Sent: 13 May 2020 17:49
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Water cooling question
 
There is a resin used for producing DI water, you just stick it in a length of tube with a bit of gauze at each end ... tap water in, DI out.  When I ran large industrial lasers, the cooling systems had a DI pack of this stuff in circuit. It kept conductivity well below around 20 uSiemens ... perfect for any high voltage use.


On Wed, 13 May 2020 at 16:30, Stephen Tompsett <stephen@...> wrote:

What about using one of the radiators designed for water cooling computers? I think that a moderate size radiator/fan can can provide a cooling capacity of 200-400W for a 10 degree temperature difference from ambient when used with an appropriate fan.


On 13/05/2020 10:03, Conrad, PA5Y wrote:
Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 

I have no idea how much heat such a radiator with a fan would take out of the water.

73

Conrad PA5Y
-- 
Stephen Tompsett (G8LYB)
Tel: 01788 578940
Mob: 07956 855816



--
Best regards,

Robin Szemeti

Redpoint Consulting Limited

E: robin@...
T: +44 (0) 1299 405028
M: +44 (0) 7971 883371

CONFIDENTIALITY NOTICE
The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the
intended recipient or person responsible for delivering it to the
intended recipient, you have received this communication in error
and must not distribute or copy it.
Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication.

Thank you.


Re: Water cooling question

Robin Szemeti - G1YFG
 

There is a resin used for producing DI water, you just stick it in a length of tube with a bit of gauze at each end ... tap water in, DI out.  When I ran large industrial lasers, the cooling systems had a DI pack of this stuff in circuit. It kept conductivity well below around 20 uSiemens ... perfect for any high voltage use.


On Wed, 13 May 2020 at 16:30, Stephen Tompsett <stephen@...> wrote:

What about using one of the radiators designed for water cooling computers? I think that a moderate size radiator/fan can can provide a cooling capacity of 200-400W for a 10 degree temperature difference from ambient when used with an appropriate fan.


On 13/05/2020 10:03, Conrad, PA5Y wrote:
Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 

I have no idea how much heat such a radiator with a fan would take out of the water.

73

Conrad PA5Y
-- 
Stephen Tompsett (G8LYB)
Tel: 01788 578940
Mob: 07956 855816



--
Best regards,

Robin Szemeti

Redpoint Consulting Limited

E: robin@...
T: +44 (0) 1299 405028
M: +44 (0) 7971 883371

CONFIDENTIALITY NOTICE
The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the
intended recipient or person responsible for delivering it to the
intended recipient, you have received this communication in error
and must not distribute or copy it.
Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication.

Thank you.


Re: What Moon/Sun tracking software is being used.

Conrad, PA5Y
 

PSTRotator has its own Moon and Sun tracking calculator which produces the same results as the one in WSJT-X,  Moonsked, F1EHN etc. It also plays perfectly with an ERC-M. I have 3 such systems and 2 of them have been and are being used for EME for quite a few years now. 

No problems at all with this combination.

Highly recommended.

73

Conrad PA5Y




From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Nick Gregory G0HIK via groups.io <nickg0hik@...>
Sent: 13 May 2020 15:44
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] What Moon/Sun tracking software is being used.
 
I use the ERC Az/El interface, which emulates the Yaesu one.
I'm currently using HamRadio Deluxe as that's what I used to use with the satellites.
What else is there, I have seen MoonSked, but I've not tried it yet.
Nick G0HIK


Re: Water cooling question

Stephen Tompsett
 

What about using one of the radiators designed for water cooling computers? I think that a moderate size radiator/fan can can provide a cooling capacity of 200-400W for a 10 degree temperature difference from ambient when used with an appropriate fan.


On 13/05/2020 10:03, Conrad, PA5Y wrote:
Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 

I have no idea how much heat such a radiator with a fan would take out of the water.

73

Conrad PA5Y
-- 
Stephen Tompsett (G8LYB)
Tel: 01788 578940
Mob: 07956 855816


Re: Water cooling question

Clive, G3GJA
 

I would leave it as it is, you’ve done enough.

 

Back in the early nineties I ran a pair of 3CX100A5s (posh 2C39As) water cooled for FM ATV. With long overs and a 25l bucket it only ever got warm , not hot.

 

The water had to be deionised with 1200v on the anodes and the leakage would remain acceptable (>10mA) for a couple of years. Best source was from dehumidifiers after filtering through a fine cloth to remove dust particles.

 

Clive G3GJA

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Conrad, PA5Y
Sent: 13 May 2020 10:03
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Water cooling question

 

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 

 

I have no idea how much heat such a radiator with a fan would take out of the water.

 

73

 

Conrad PA5Y

HESH Computer Services Limited

Tel: (01482) 324936

12 Louis Pearlman Centre

Web: www.hesh.co.uk

Goulton Street

Registered in England No.: 3003479

Hull

VAT No.: GB 647 3679 95

HU3 4DL

 

Disclaimer:

The information contained in this email may be legally privileged and/or confidential. If you are not the intended recipient, use of this information (including disclosure, copying or distribution) or any action taken, or omitted to be taken, in reliance on it is prohibited and may be unlawful; therefore please inform the sender and delete the message immediately. The views expressed in this email are those of the originator and not necessarily those held by HESH Computer Services Ltd, who do not accept liability for any action taken in reliance on the contents of this message or for the consequences of any computer viruses which may have been transmitted by this email.


Re: Water cooling question

Neil Smith G4DBN
 

If my PA cooling fluid tank gets over 30C, I chuck a load of ice cubes in it.  That takes 300-odd kJ per kg to melt, and cools my 50 litre tank by about 2 degrees per kilo of ice.

Neil G4DBN


On 13/05/2020 15:52, Ian White wrote:

As others have said, it's difficult to remove heat from a coolant that is barely above room temperature itself. On the other hand, it's very easy to increase the total mass of water and continue to use passive cooling.


Changing to a full-size 110 litre dustbin would reduce the temperature rise by a factor of 2 and increase the surface area for passive cooling by a factor closer to 4. Next step in that direction would be a 240 litre wheelie bin. It sounds like you have space enough for that.


Another data-point from the 2C39 days is that K2UYH used to operate a water cooled ring of 8 for a whole EME weekend using a large bin with no other cooling.


73 from Ian GM3SEK



On 13/05/2020 10:03, Conrad, PA5Y wrote:

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 

I have no idea how much heat such a radiator with a fan would take out of the water.


Re: Water cooling question

Ian White
 

As others have said, it's difficult to remove heat from a coolant that is barely above room temperature itself. On the other hand, it's very easy to increase the total mass of water and continue to use passive cooling.


Changing to a full-size 110 litre dustbin would reduce the temperature rise by a factor of 2 and increase the surface area for passive cooling by a factor closer to 4. Next step in that direction would be a 240 litre wheelie bin. It sounds like you have space enough for that.


Another data-point from the 2C39 days is that K2UYH used to operate a water cooled ring of 8 for a whole EME weekend using a large bin with no other cooling.


73 from Ian GM3SEK



On 13/05/2020 10:03, Conrad, PA5Y wrote:

Last night I ran my new water-cooled PA for 4.5hrs during the NAC/UKAC. I use 50l of distilled water in a barrel and a 30l/min pond pump. It all worked fine but the water was lukewarm so I was thinking that a small car heater radiator might be appropriate? I will bring the thermocouple from work and make some measurements but I estimate that the water was less than 30 deg C. I was wondering if these cheaper and small car heater radiators would help? Ironically I don't care about fan noise as I have a machine room next to the shack. It's an ex broadcast PA and just happened to be water-cooled and cheap. 

I have no idea how much heat such a radiator with a fan would take out of the water.

73

Conrad PA5Y


Re: What Moon/Sun tracking software is being used.

Brian Howie GM4DIJ
 

In message <tFTy.1589377475733179422.Kso9@groups.io>, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> writes
I use the ERC Az/El interface, which emulates the Yaesu one.
I'm currently using HamRadio Deluxe as that's what I used to use with
the satellites.
What else is there, I have seen MoonSked, but I've not tried it yet.
Nick G0HIK
This might do it.

Https://www.satsignal.eu/software/wxtrack.htm

You'd have to input the moon and sun Keplerian elements for sun and moon tracking.

Brian GM4DIJ
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Brian Howie

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