Date   

Re: latching relays?

Colin Ranson
 

Ben, Neil, all.

 

 

I have a  pic of completed board, should be easy enough to replicate..... unless someone has bought rights to Dave’s designs of course.

 

Please e-mail me for a copy if you are interested.      

 

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Colin Ranson
Sent: 25 March 2021 15:45
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] latching relays?

 

Hi Ben, I have a number of these in use......

 

 

http://huprf.com/huprf/latching-relay-driver-board/

 

 

Someone was supposed to take over production (DX Shop ?) when Dave died but I think it never happened, I may be wrong though.

 

I got one spare for future use.    Attached is the configuration PDF in case it goes walkies into a data black hole one day.

 

Been looking for a PCB layout but no luck yet.

 

Colin de G8LBS

 

 

 

Sent from Mail for Windows 10

 

From: Neil Smith G4DBN
Sent: 25 March 2021 12:34
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] latching relays?

 

If they don't have tellback contacts, there is a bit of a problem in knowing the current state of the relay following loss of power for instance. I've just bought some HP latching jobs with 3.5 mm connectors and no tellbacks, so I have the same issue as you.  This one I have on the bench at the moment is rated at 15 V and pulls about 170 mA.  The others I have all come with separate tellbacks or internal contact so the current drops to zero once the relay has flipped.

The way I'm dealing with these is to use a PIC as a sequencer and just send a half-second pulse to a low-side FET switch.

Not exactly low-tech. How about a small double pole relay with two resistors and two electrolytics? Electrolytics sized to give a 200ms pulse on the relay and a resistor with 10 times the value of the coil resistance to recharge the cap?  You'd end up with a small current through the active coil all the time on rx and tx, but only 10 mA.

Neil G4DBN

On 25/03/2021 11:10, militaryoperator via groups.io wrote:

There was a thread a while back about lathing relays. 

 

The ones I had required a voltage, they latched then pulled no current.

 

One's I have just got need volts to latch then pull about 100mA if volts left on. As they don't need volts all the time, what's the best way, circuit etc, to pulse them, common goes to ground and a 12v pulse on 1 or 2 needed to latch etc. 

 

Just trying to avoid over-straining my few remaining brain cells, and not re-invent the wheel again. 

 

Ben.  

-- 
Neil
http://g4dbn.uk

 

 


Re: latching relays?

Colin Ranson
 

Hi Ben, I have a number of these in use......

 

 

http://huprf.com/huprf/latching-relay-driver-board/

 

 

Someone was supposed to take over production (DX Shop ?) when Dave died but I think it never happened, I may be wrong though.

 

I got one spare for future use.    Attached is the configuration PDF in case it goes walkies into a data black hole one day.

 

Been looking for a PCB layout but no luck yet.

 

Colin de G8LBS

 

 

 

Sent from Mail for Windows 10

 

From: Neil Smith G4DBN
Sent: 25 March 2021 12:34
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] latching relays?

 

If they don't have tellback contacts, there is a bit of a problem in knowing the current state of the relay following loss of power for instance. I've just bought some HP latching jobs with 3.5 mm connectors and no tellbacks, so I have the same issue as you.  This one I have on the bench at the moment is rated at 15 V and pulls about 170 mA.  The others I have all come with separate tellbacks or internal contact so the current drops to zero once the relay has flipped.

The way I'm dealing with these is to use a PIC as a sequencer and just send a half-second pulse to a low-side FET switch.

Not exactly low-tech. How about a small double pole relay with two resistors and two electrolytics? Electrolytics sized to give a 200ms pulse on the relay and a resistor with 10 times the value of the coil resistance to recharge the cap?  You'd end up with a small current through the active coil all the time on rx and tx, but only 10 mA.

Neil G4DBN

On 25/03/2021 11:10, militaryoperator via groups.io wrote:

There was a thread a while back about lathing relays. 

 

The ones I had required a voltage, they latched then pulled no current.

 

One's I have just got need volts to latch then pull about 100mA if volts left on. As they don't need volts all the time, what's the best way, circuit etc, to pulse them, common goes to ground and a 12v pulse on 1 or 2 needed to latch etc. 

 

Just trying to avoid over-straining my few remaining brain cells, and not re-invent the wheel again. 

 

Ben.  

-- 
Neil
http://g4dbn.uk

 


Re: GRP tube

Colin Ranson
 

Thanks Stuart,

 

 

Colin

 

Sent from Mail for Windows 10

 

From: Stuart M1GSM via groups.io
Sent: 25 March 2021 08:18
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

[Edited Message Follows]

They have off cuts, I think I got a 3m 2" (scaf) & 1 1/2" and some other bits for £25
The postage is expensive £28

Unless you get it delivered to a business address £18, they don't know why this is ether :)
i was working near one day so popped in.

They basically make direct copies of industrial stairs and walkways but all in GRP
So spark free, so plenty bits for all those scaff railings too.

I spoke to

Mel Perkins

Engineered Composites Ltd

Unit B4

Borders 2 Industrial Park

River Lane Saltney

Chester

CH4 8RJ

Tel: 01244 676000

DDI: 01244 980333

Fax: 01244 677267

e-mail: melanie@...

 


Re: latching relays?

Clive Jenner
 
Edited

Hi I have a couple of Latching Coaxial Relay Drivers on eBay. search for "Latching Coaxial Relay driver"

73 Clive GW0PPO

 


Re: GRP tube

g4zod@btinternet.com
 

Be careful of some lightweight masts.
My brother gave me   wind surfing  masts to donate to club members. The trouble was that some were made from fibre glass and as they age can shed fibres. ( This problem can be solved by slapping a coat of paint over the pole.)
These poles are now  doing sterling duty  at member' s  QTHs
G4ZOD


Sent from BlueMail

On 25 Mar 2021, at 11:43, "Gordon REASON via groups.io" <virgin.net@groups.io target=_blank>gordonj.reason=virgin.net@groups.io> wrote:

and old boat mast's .... boat chandlers may help ?

On 25 March 2021 at 08:03 Stephen Tompsett <stephen@...> wrote:

Just give them a call...

FYI from memory.

In 2019 a number of local amateurs purchased 6m 48.5mm diameter  6.65mm thich GRP Scaffold poles - at approx £80 each, Delivery was a fixed cost for the order approx £25

The tube you want is a lot lighter...

On 24/03/2021 22:49, Colin Ranson wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 

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


 


 


Re: latching relays?

Andy G4JNT
 

That's the advantage of using microcontrollers for all Tx/Rx switching and sequencing.
The algorithm can preset all latching relays into the correct position  before anything is activated
If there art ellback contacts it can read these



On Thu, 25 Mar 2021 at 12:34, Neil Smith G4DBN <neil@...> wrote:

If they don't have tellback contacts, there is a bit of a problem in knowing the current state of the relay following loss of power for instance. I've just bought some HP latching jobs with 3.5 mm connectors and no tellbacks, so I have the same issue as you.  This one I have on the bench at the moment is rated at 15 V and pulls about 170 mA.  The others I have all come with separate tellbacks or internal contact so the current drops to zero once the relay has flipped.

The way I'm dealing with these is to use a PIC as a sequencer and just send a half-second pulse to a low-side FET switch.

Not exactly low-tech. How about a small double pole relay with two resistors and two electrolytics? Electrolytics sized to give a 200ms pulse on the relay and a resistor with 10 times the value of the coil resistance to recharge the cap?  You'd end up with a small current through the active coil all the time on rx and tx, but only 10 mA.

Neil G4DBN

On 25/03/2021 11:10, militaryoperator via groups.io wrote:
There was a thread a while back about lathing relays. 

The ones I had required a voltage, they latched then pulled no current.

One's I have just got need volts to latch then pull about 100mA if volts left on. As they don't need volts all the time, what's the best way, circuit etc, to pulse them, common goes to ground and a 12v pulse on 1 or 2 needed to latch etc. 

Just trying to avoid over-straining my few remaining brain cells, and not re-invent the wheel again. 

Ben.  

-- 
Neil
http://g4dbn.uk


Re: latching relays?

Neil Smith G4DBN
 

If they don't have tellback contacts, there is a bit of a problem in knowing the current state of the relay following loss of power for instance. I've just bought some HP latching jobs with 3.5 mm connectors and no tellbacks, so I have the same issue as you.  This one I have on the bench at the moment is rated at 15 V and pulls about 170 mA.  The others I have all come with separate tellbacks or internal contact so the current drops to zero once the relay has flipped.

The way I'm dealing with these is to use a PIC as a sequencer and just send a half-second pulse to a low-side FET switch.

Not exactly low-tech. How about a small double pole relay with two resistors and two electrolytics? Electrolytics sized to give a 200ms pulse on the relay and a resistor with 10 times the value of the coil resistance to recharge the cap?  You'd end up with a small current through the active coil all the time on rx and tx, but only 10 mA.

Neil G4DBN

On 25/03/2021 11:10, militaryoperator via groups.io wrote:
There was a thread a while back about lathing relays. 

The ones I had required a voltage, they latched then pulled no current.

One's I have just got need volts to latch then pull about 100mA if volts left on. As they don't need volts all the time, what's the best way, circuit etc, to pulse them, common goes to ground and a 12v pulse on 1 or 2 needed to latch etc. 

Just trying to avoid over-straining my few remaining brain cells, and not re-invent the wheel again. 

Ben.  

-- 
Neil
http://g4dbn.uk


Re: latching relays?

militaryoperator
 

I got these from W6PQL about $20 per board ...arrived quite quickly 


Steve G4HTZ 
--------------------------

Thanks Steve. 

Was thinking about it and just tried something, this might work. After latching current drops back to just a few mA as cap charges. 
Will play further. 
Ben
Image (57).jpg


Re: latching relays?

Kjeld, OZ1FF
 

For latching relays that don’t shot off current I use an SOIC Dual Coil Driver FAN3240TMX from Fairchild Semiconductor – now ON Semiconductor.

 

Vy 73 de OZ1FF/Kjeld

 

Member UK µWave Group, DDXG

 

Phone/SMS +45 4021 1119

 

https://www.oz1ff.dk

 


Re: latching relays?

Steve G4HTZ
 

I got these from W6PQL about $20 per board ...arrived quite quickly 



--
Steve G4HTZ 
JO01JN60
Great Wakering, Essex 
24ghz 1.8w 80cm dish 

also known to be active occasionally on 70cms DATV 


Re: GRP tube

Gordon REASON <gordonj.reason@...>
 

and old boat mast's .... boat chandlers may help ?

On 25 March 2021 at 08:03 Stephen Tompsett <stephen@...> wrote:

Just give them a call...

FYI from memory.

In 2019 a number of local amateurs purchased 6m 48.5mm diameter  6.65mm thich GRP Scaffold poles - at approx £80 each, Delivery was a fixed cost for the order approx £25

The tube you want is a lot lighter...

On 24/03/2021 22:49, Colin Ranson wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 

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


 


 


latching relays?

militaryoperator
 

There was a thread a while back about lathing relays. 

The ones I had required a voltage, they latched then pulled no current.

One's I have just got need volts to latch then pull about 100mA if volts left on. As they don't need volts all the time, what's the best way, circuit etc, to pulse them, common goes to ground and a 12v pulse on 1 or 2 needed to latch etc. 

Just trying to avoid over-straining my few remaining brain cells, and not re-invent the wheel again. 

Ben.  


Re: GRP tube

John Lemay
 

Colin

 

Another supplier is All Propped Up. Looks like a quite extensive range and shipping is £20.

 

Shipping anything over a couple of metres long is going to be expensive because that’s what the carriers charge, and only a few will carry long parcels – such as Tuffnells and DHL.

 

John G4ZTR

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Stuart M1GSM via groups.io
Sent: 25 March 2021 08:08
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

[Edited Message Follows]

They have off cuts, I think I got a 3m 2" (scaf) & 1 1/2" and some other bits for £25
The postage is expensive £28

Unless you get it delivered to a business address £18, they don't know why this is ether :)
i was working near one day so popped in.

They basically make direct copies of industrial stairs and walkways but all in GRP
So spark free, so plenty bits for all those scaff railings too.

I spoke to

Mel Perkins

Engineered Composites Ltd

Unit B4

Borders 2 Industrial Park

River Lane Saltney

Chester

CH4 8RJ

Tel: 01244 676000

DDI: 01244 980333

Fax: 01244 677267

e-mail: melanie@...


Re: GRP tube

Stuart M1GSM
 
Edited

They have off cuts, I think I got a 3m 2" (scaf) & 1 1/2" and some other bits for £25
The postage is expensive £28

Unless you get it delivered to a business address £18, they don't know why this is ether :)
i was working near one day so popped in.

They basically make direct copies of industrial stairs and walkways but all in GRP
So spark free, so plenty bits for all those scaff railings too.

I spoke to

Mel Perkins
Engineered Composites Ltd
Unit B4
Borders 2 Industrial Park
River Lane Saltney
Chester
CH4 8RJ
Tel: 01244 676000
DDI: 01244 980333
Fax: 01244 677267
e-mail: melanie@...


Re: GRP tube

Paul G8AQA
 

Later in the year I will be needing some GRP tube for a 4 Yagi 2m eme array in due course. Not sure of the lengths yet but I may be able to help with a purchase if  necessary. If it is delivered here I could cut off a length and send it on.

Paul G8AQA

On 24/03/2021 23:45, Gordon REASON via groups.io wrote:

www.hongbangcomposites.com/

Bbbbbbbest I can find on a quick search .............

I have messaged a pipe company in the west midlands  too .....................

On 24 March 2021 at 23:30 "Gordon REASON via groups.io" <gordonj.reason@...> wrote:

Ok Colin ,

Well if you have some .......... there must be more out there , somewhere .............

Perhaps an email to a scaffold pipe manufacturer might get a result ..............

Never give up .

On 24 March 2021 at 23:23 Colin Ranson <g8lbs@...> wrote:

Hi Gordon,

 

Neither of those you mentioned would be strong enough.   Just as an aside they now make Glass Fibre scaffold tube.... its as strong as the steel one apparently.

 

I only need a four foot length but if it was cheap enough I’d get a 6m length and sell the rest on e-bay.... I fear it’s well pricey though.

 

I have a two foot length here that was left over from making the GB3IH collinears 30 years ago, it was like hens teeth then.

 

Regards and thanks for reply

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Gordon REASON via groups.io
Sent: 24 March 2021 23:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 

 

 


 


 


 


 



Virus-free. www.avg.com


Re: GRP tube

Stephen Tompsett
 

Just give them a call...

FYI from memory.

In 2019 a number of local amateurs purchased 6m 48.5mm diameter  6.65mm thich GRP Scaffold poles - at approx £80 each, Delivery was a fixed cost for the order approx £25

The tube you want is a lot lighter...

On 24/03/2021 22:49, Colin Ranson wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 

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


Re: OZ8AFC 8.4 GHz Feedhorn with adjustable Scalar Rings

Keith
 

Thanks for the info folks, both online and off.
It arrived this morning, a beautiful piece of machining.
Now I have to find the right dish to use it in :(
Cheers
Keith VK6KB /VK6EME


Re: GRP tube

Gordon REASON <gordonj.reason@...>
 

www.hongbangcomposites.com/

Bbbbbbbest I can find on a quick search .............

I have messaged a pipe company in the west midlands  too .....................

On 24 March 2021 at 23:30 "Gordon REASON via groups.io" <gordonj.reason@...> wrote:

Ok Colin ,

Well if you have some .......... there must be more out there , somewhere .............

Perhaps an email to a scaffold pipe manufacturer might get a result ..............

Never give up .

On 24 March 2021 at 23:23 Colin Ranson <g8lbs@...> wrote:

Hi Gordon,

 

Neither of those you mentioned would be strong enough.   Just as an aside they now make Glass Fibre scaffold tube.... its as strong as the steel one apparently.

 

I only need a four foot length but if it was cheap enough I’d get a 6m length and sell the rest on e-bay.... I fear it’s well pricey though.

 

I have a two foot length here that was left over from making the GB3IH collinears 30 years ago, it was like hens teeth then.

 

Regards and thanks for reply

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Gordon REASON via groups.io
Sent: 24 March 2021 23:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 

 

 


 


 


 


 


Re: GRP tube

Gordon REASON <gordonj.reason@...>
 

Ok Colin ,

Well if you have some .......... there must be more out there , somewhere .............

Perhaps an email to a scaffold pipe manufacturer might get a result ..............

Never give up .

On 24 March 2021 at 23:23 Colin Ranson <g8lbs@...> wrote:

Hi Gordon,

 

Neither of those you mentioned would be strong enough.   Just as an aside they now make Glass Fibre scaffold tube.... its as strong as the steel one apparently.

 

I only need a four foot length but if it was cheap enough I’d get a 6m length and sell the rest on e-bay.... I fear it’s well pricey though.

 

I have a two foot length here that was left over from making the GB3IH collinears 30 years ago, it was like hens teeth then.

 

Regards and thanks for reply

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Gordon REASON via groups.io
Sent: 24 March 2021 23:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 

 

 


 


 


Re: GRP tube

Colin Ranson
 

Hi Gordon,

 

Neither of those you mentioned would be strong enough.   Just as an aside they now make Glass Fibre scaffold tube.... its as strong as the steel one apparently.

 

I only need a four foot length but if it was cheap enough I’d get a 6m length and sell the rest on e-bay.... I fear it’s well pricey though.

 

I have a two foot length here that was left over from making the GB3IH collinears 30 years ago, it was like hens teeth then.

 

Regards and thanks for reply

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Gordon REASON via groups.io
Sent: 24 March 2021 23:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GRP tube

 

For interest's sake , t5here are two types of common hite water pipe , one is just pvc and very flexible ,

the other uses ceramic beads , and pvc? ........ but has a stiffer form .

If you could find the manufactures , they may make something to suit your application ?

On 24 March 2021 at 22:49 Colin Ranson <g8lbs@...> wrote:

Hi all,

Before I waste my time, and theirs, by phoning Engineered Composites (Radcom ad) for a price – does anyone know the rough price of 38mm GRP tube, 3mm wall thickness – comes in 6m lengths – and the carriage.  Don’t seem to find this info on their site.   I think it will be wholly expensive.

 

 

Regards, and thanks

 

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 


 


 

 

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