Date   

Re: ADF4351 Control Problems

Wayne Knowles <w.knowles@...>
 

From experience with the ZLPLL you need a good earth connection or ground plane between the controller and the ADF4351 to get reliable programming.
Ideally a 4 core usb style cable should be used to give a good shield on the signals at high speed over a long distance. This also helps protest you from EMI related issues in a RF environment.

Slowing down the SPI speed should also help you diagnose. Also check the polarity of the clocking and signals to make sure it matches the datasheet.


73
Wayne ZL2BKC


ADF4351 Control Problems

Dave G8GKQ
 

I am using an eBay (black) ADF4351 module as the LO for a DATV transmitter.  It is being controlled over SPI by a Raspberry Pi using some C code that I have written which allows 10us settling time after any state change on any of the 3 lines.


With short wiring between the Raspberry Pi GPIO and the ADF4351 module, it works perfectly.  However, the moment I put more than about 20cm of wire on it, it ceases to start when commanded.  The signals still look perfect on a low bandwidth digital storage 'scope, so I am guessing that it is a rise time issue, rather than anything else.


There is nothing in the AD data sheet about a minimum rise time, but of course this is a Chinese module...


Has anybody observed similar behaviour?


Dave, G8GKQ


Waveguide Switch

Paul G8AQA
 

I have acquired a WG16 2 way relay and google has not come up with any info.  I am looking for the pin connections and any other switching info.  It has a 6 pin circular connector the details on the label are as follows:-


WAVEGUIGE SWITCH

97942-577R341 HO2 REV.S

28VDC

Solitron/Microwave

MOD.  REP. 13958

Royal Microwave DIV.

Long Island City. N.Y.  MFR. (07149)

F.S.N. 2R1430-762-7179-AY7X

C.N. NOO383-71-C11053

DATE CODE 7119     U.S.


Pins A & B will actuate the switch when 28 V are applied but it becomes quite warm in less than a minute.  There is no connection between the other 4 wires or A or B at any time. It would seem therefore to need a lower sustaining voltage. I am guessing that there is a fault but would like more information before dismantling it.


Any help would be appreciated.


As it is to go in a WG17 EME system for 10GHz it would be better to get a WG17 switch.  Can anyone help?


73

Paul G8AQA




Re: Broadcom Obsolescence Notice

Charles Brain <chbrain@...>
 

Attention dinosaurs

If GNURadio is too hard then there is always ScratchRadio aimed at children
https://github.com/myriadrf/ScratchRadio

- Charles G4GUO


Re: Broadcom Obsolescence Notice

Christopher Bartram <cbartram@...>
 

I feel John's comments are a little too pessimistic! I suspect that for real amateur radio, many of the functions for which we currently use commercial transceivers will disappear into commodity 'SDR' products. That is the way in which things are moving and I'm already going down that route - John will doubtless be amused to hear that I have also been trying to fully come to terms with GNR Radio Companion, albeit directly running under Linux rather than via a Windows app.  I built my own transceiver hardware about 18months ago (I must put it in a box!), based on the Hermes Lite_1 DDC/DUC boards  and an Altera Cyclone 5 FPGA evaluation board running code by Steve Haynal, KF7O, developed from the OpenSource, Hermes transceiver project. Running initially under QUISK, that's taught me a quite a lot about the weaknesses of SRD signal paths. Coming to terms with FGAs is high up my list of learning projects.

A number of people are beginning to develop complementary PCBs to compensate for some of the weaknesses of these boards.  However, the architectures of the 'SDR' PCBs, while providing adequate performance in many situations, and utilising monolithic silicon technology extremely well, aren't THAT good for many of the the kinds of application to which we put them. Flexibility inevitably means compromise, and it's not possible to ignore the basics of receiver and transmitter signal path design, just because part of it has moved to the digital domain!

One of the ways in which flexibility is achieved is to use techniques such as zero IF (direct conversion, image cancelling) front-ends driving relatively low-bandwidth A/D converters. That makes sense to the chip manufacturers, as it removes the need to provide image rejection with analogue filters, and they can drop a complete T/R system onto a single piece of silicon, but it also adds other susceptibilities: particularly harmonic responses, even order intermodulation responses, and, particularly at UHF and above, reciprocal mixing from the on-chip VCOs in the synthesisers.

As I'm not interested in frequency bands much more than a couple of MHz wide, my approach to my future microwave system is to use a 16-bit DDC/DUC transceiver at just above HF to transvert to the VHF bands. That way, with suitable design of the transverters, and modern parts, I'll be able to retain most of the excellent linearity, reciprocal mixing and noise performance of the DDS/DUC transceiver on the VHF bands. I'll also have access to adaptive linearisation of the transmitter strip. I will then transvert to the microwave bands that interest me using good frequency domain filtering, paying a lot of attention to gain distribution and the dynamic performance of individual stages.

73

Chris GW4DGU


Re: Broadcom Obsolescence Notice

Conrad, PA5Y
 

I know because you made it perfectly clear :-)

I prefer to live in the past because I work in what is often referred to as 'the future' and its pretty dull! I even have a split cane fishing rod , a centre pin reel and l  use valve amplifiers on the low bands.

Broadcom are trying to save money so that they can buy companies and form NXQUALBROAD.

73

Conrad PA5Y


On 19/01/2018 13:20, g4bao john@... [ukmicrowaves] wrote:
Not You Sam!.....but you can probably work out who,  after my recent experiences with a well known supplier!

;-) 

On 19 January 2018 at 11:43, jewell@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Now, who would that be aimed at!!!?


I think John is probably correct, but I hope not.

Other companies, like MCL, have already started to step in and offer their own alternative parts. Like valves, discrete parts never will completely disappear, but will become increasingly a niche. I suspect that during my remaining time it will still be possible to find discrete parts. After that I won’t worry about it!

In the meantime it is hard to ignore the move to modular circuitry with programmable functions.

73 de Sam, G4DDK




Sent from Yahoo Mail for iPad


On Friday, January 19, 2018, 11:36 am, John Worsnop john@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 
It all goes along with what I've been banging on about in "RadCom GHz Bands" lately. Wireless hardware is becoming a commodity. Like it or not, the future for our hobby lies in writing clever code for standard modules. The days of the homebrew transverter are numberd! 

And as for leaded components........... Just for the Dinasours..........

Discuss.........😆

73 John 

On 19 Jan 2018 10:24, "Gordon REASON gordonj.reason@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 


So .. this is progress then ......... 

I've no doubt that our friends in China , will manufacture and maintain stocks , if there is a method of letting them know ...?

On 18 January 2018 at 23:26 "'Lehane Kellett (g8kmh)' g8kmh@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

But surprsing (and sad) to see 'bread and butter' MMIC's like the AMMC 5618 (HMMC5618) go obsololete - a part in 000's of COTS products - like the Alcatel units. And probably making repairs impossible, longer term, to a lot of HP/Agilent test gear that use many of the parts being discontinued.

Guess Analog/Hittite will take the market left by Broadcom.

73
Lehane
EA3/G8KMH

On 18/01/2018 20:31, Christopher Bartram cbartram@... [ukmicrowaves] wrote:
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone,
either. Other manufacturers have now deleted large chunks of their
microwave semiconductor lists, NEC and Mitsubishi amongst them. This is
generally a result of 'rationalisation' and the madness of the market
rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices
are now made by a very few specialised companies, and, of course, those
parts aren't cheap ...

73

Chris

GW4DGU




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Re: Broadcom Obsolescence Notice

Pete - GM4BYF
 

I am a dinasour ! Lots of components with leads.

73
Pete GM4BYF
On 19/01/18 11:43, jewell@... [ukmicrowaves] wrote:

 

Now, who would that be aimed at!!!?


I think John is probably correct, but I hope not.

Other companies, like MCL, have already started to step in and offer their own alternative parts. Like valves, discrete parts never will completely disappear, but will become increasingly a niche. I suspect that during my remaining time it will still be possible to find discrete parts. After that I won’t worry about it!

In the meantime it is hard to ignore the move to modular circuitry with programmable functions.

73 de Sam, G4DDK




Sent from Yahoo Mail for iPad

On Friday, January 19, 2018, 11:36 am, John Worsnop john@... [ukmicrowaves] wrote:

 
It all goes along with what I've been banging on about in "RadCom GHz Bands" lately. Wireless hardware is becoming a commodity. Like it or not, the future for our hobby lies in writing clever code for standard modules. The days of the homebrew transverter are numberd! 

And as for leaded components.......... Just for the Dinasours..........

Discuss.........😆

73 John 

On 19 Jan 2018 10:24, "Gordon REASON gordonj.reason@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 


So .. this is progress then ......... 

I've no doubt that our friends in China , will manufacture and maintain stocks , if there is a method of letting them know ...?

On 18 January 2018 at 23:26 "'Lehane Kellett (g8kmh)' g8kmh@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

But surprsing (and sad) to see 'bread and butter' MMIC's like the AMMC 5618 (HMMC5618) go obsololete - a part in 000's of COTS products - like the Alcatel units. And probably making repairs impossible, longer term, to a lot of HP/Agilent test gear that use many of the parts being discontinued.

Guess Analog/Hittite will take the market left by Broadcom.

73
Lehane
EA3/G8KMH

On 18/01/2018 20:31, Christopher Bartram cbartram@... [ukmicrowaves] wrote:
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone,
either. Other manufacturers have now deleted large chunks of their
microwave semiconductor lists, NEC and Mitsubishi amongst them. This is
generally a result of 'rationalisation' and the madness of the market
rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices
are now made by a very few specialised companies, and, of course, those
parts aren't cheap ...

73

Chris

GW4DGU




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This email has been checked for viruses by AVG antivirus software.
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Re: Broadcom Obsolescence Notice

g4bao
 

Not You Sam!.....but you can probably work out who,  after my recent experiences with a well known supplier!

;-) 

On 19 January 2018 at 11:43, jewell@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Now, who would that be aimed at!!!?


I think John is probably correct, but I hope not.

Other companies, like MCL, have already started to step in and offer their own alternative parts. Like valves, discrete parts never will completely disappear, but will become increasingly a niche. I suspect that during my remaining time it will still be possible to find discrete parts. After that I won’t worry about it!

In the meantime it is hard to ignore the move to modular circuitry with programmable functions.

73 de Sam, G4DDK




Sent from Yahoo Mail for iPad


On Friday, January 19, 2018, 11:36 am, John Worsnop john@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

It all goes along with what I've been banging on about in "RadCom GHz Bands" lately. Wireless hardware is becoming a commodity. Like it or not, the future for our hobby lies in writing clever code for standard modules. The days of the homebrew transverter are numberd! 

And as for leaded components.......... Just for the Dinasours..........

Discuss.........😆

73 John 

On 19 Jan 2018 10:24, "Gordon REASON gordonj.reason@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 


So .. this is progress then ......... 

I've no doubt that our friends in China , will manufacture and maintain stocks , if there is a method of letting them know ...?

On 18 January 2018 at 23:26 "'Lehane Kellett (g8kmh)' g8kmh@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

But surprsing (and sad) to see 'bread and butter' MMIC's like the AMMC 5618 (HMMC5618) go obsololete - a part in 000's of COTS products - like the Alcatel units. And probably making repairs impossible, longer term, to a lot of HP/Agilent test gear that use many of the parts being discontinued.

Guess Analog/Hittite will take the market left by Broadcom.

73
Lehane
EA3/G8KMH

On 18/01/2018 20:31, Christopher Bartram cbartram@... [ukmicrowaves] wrote:
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone,
either. Other manufacturers have now deleted large chunks of their
microwave semiconductor lists, NEC and Mitsubishi amongst them. This is
generally a result of 'rationalisation' and the madness of the market
rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices
are now made by a very few specialised companies, and, of course, those
parts aren't cheap ...

73

Chris

GW4DGU




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Re: Broadcom Obsolescence Notice

rfeng@...
 

As Chris says it's the way of the world these days. Obsoloescence is a real PITA and getting more and more so. I feel like I spend more time dealing with it keeping both old desings and sometimes relatively new designs going. A major headache when some projects need support for decades.

At the start of December I started a new design using a number of  tried and trusted 'HP' diodes only to find on my first day back in January when I went to get a Broadcom data sheet I'd missed out of my design file that in the mean time they had all been made obsolete. Fortunately there wrere suitable replacements from the likes of NXP and Infineon, but still a waste of time finding them.

We have some one here whose job is trying to keep ahead of it all; he passed me a long list of Broadcom parts to sort through this morning; I'd been anticipating it but hoped it wouldn't come along too soon. So so far I've had a 'happy day' finding alternatives or where it is too risky to cahnge or customer doesn't allow, getting the comapny to fork out on life time buys. 

>> I've no doubt that our friends in China , will manufacture and maintain stocks
I won't start on traceablity, another bain of my life.

It would be nice to have the opportunity to do some real desing work rather than just paper work for it's own sake.

Rant over.
I'm sure many other engineers share the same frustrations.
Peter


Re: Broadcom Obsolescence Notice

SAM JEWELL
 

Now, who would that be aimed at!!!?

I think John is probably correct, but I hope not.

Other companies, like MCL, have already started to step in and offer their own alternative parts. Like valves, discrete parts never will completely disappear, but will become increasingly a niche. I suspect that during my remaining time it will still be possible to find discrete parts. After that I won’t worry about it!

In the meantime it is hard to ignore the move to modular circuitry with programmable functions.

73 de Sam, G4DDK

On Friday, January 19, 2018, 11:36 am, John Worsnop john@... [ukmicrowaves] wrote:

 

It all goes along with what I've been banging on about in "RadCom GHz Bands" lately. Wireless hardware is becoming a commodity. Like it or not, the future for our hobby lies in writing clever code for standard modules. The days of the homebrew transverter are numberd! 

And as for leaded components.......... Just for the Dinasours..........

Discuss.........😆

73 John 

On 19 Jan 2018 10:24, "Gordon REASON gordonj.reason@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 


So .. this is progress then ......... 

I've no doubt that our friends in China , will manufacture and maintain stocks , if there is a method of letting them know ...?

On 18 January 2018 at 23:26 "'Lehane Kellett (g8kmh)' g8kmh@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

But surprsing (and sad) to see 'bread and butter' MMIC's like the AMMC 5618 (HMMC5618) go obsololete - a part in 000's of COTS products - like the Alcatel units. And probably making repairs impossible, longer term, to a lot of HP/Agilent test gear that use many of the parts being discontinued.

Guess Analog/Hittite will take the market left by Broadcom.

73
Lehane
EA3/G8KMH

On 18/01/2018 20:31, Christopher Bartram cbartram@... [ukmicrowaves] wrote:
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone,
either. Other manufacturers have now deleted large chunks of their
microwave semiconductor lists, NEC and Mitsubishi amongst them. This is
generally a result of 'rationalisation' and the madness of the market
rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices
are now made by a very few specialised companies, and, of course, those
parts aren't cheap ...

73

Chris

GW4DGU




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Re: Broadcom Obsolescence Notice

g4bao
 

It all goes along with what I've been banging on about in "RadCom GHz Bands" lately. Wireless hardware is becoming a commodity. Like it or not, the future for our hobby lies in writing clever code for standard modules. The days of the homebrew transverter are numberd! 

And as for leaded components.......... Just for the Dinasours..........

Discuss.........😆

73 John 

On 19 Jan 2018 10:24, "Gordon REASON gordonj.reason@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 


So .. this is progress then ......... 

I've no doubt that our friends in China , will manufacture and maintain stocks , if there is a method of letting them know ...?

On 18 January 2018 at 23:26 "'Lehane Kellett (g8kmh)' g8kmh@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

But surprsing (and sad) to see 'bread and butter' MMIC's like the AMMC 5618 (HMMC5618) go obsololete - a part in 000's of COTS products - like the Alcatel units. And probably making repairs impossible, longer term, to a lot of HP/Agilent test gear that use many of the parts being discontinued.

Guess Analog/Hittite will take the market left by Broadcom.

73
Lehane
EA3/G8KMH

On 18/01/2018 20:31, Christopher Bartram cbartram@... [ukmicrowaves] wrote:
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone,
either. Other manufacturers have now deleted large chunks of their
microwave semiconductor lists, NEC and Mitsubishi amongst them. This is
generally a result of 'rationalisation' and the madness of the market
rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices
are now made by a very few specialised companies, and, of course, those
parts aren't cheap ...

73

Chris

GW4DGU




AVG logo

This email has been checked for viruses by AVG antivirus software.
www.avg.com



 


 


 



Re: Broadcom Obsolescence Notice

Gordon REASON <gordonj.reason@...>
 


So .. this is progress then ......... 

I've no doubt that our friends in China , will manufacture and maintain stocks , if there is a method of letting them know ...?

On 18 January 2018 at 23:26 "'Lehane Kellett (g8kmh)' g8kmh@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

But surprsing (and sad) to see 'bread and butter' MMIC's like the AMMC 5618 (HMMC5618) go obsololete - a part in 000's of COTS products - like the Alcatel units. And probably making repairs impossible, longer term, to a lot of HP/Agilent test gear that use many of the parts being discontinued.

Guess Analog/Hittite will take the market left by Broadcom.

73
Lehane
EA3/G8KMH

On 18/01/2018 20:31, Christopher Bartram cbartram@... [ukmicrowaves] wrote:
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone,
either. Other manufacturers have now deleted large chunks of their
microwave semiconductor lists, NEC and Mitsubishi amongst them. This is
generally a result of 'rationalisation' and the madness of the market
rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices
are now made by a very few specialised companies, and, of course, those
parts aren't cheap ...

73

Chris

GW4DGU




AVG logo

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www.avg.com



 


 


 


Re: Broadcom Obsolescence Notice

Lehane Kellett G8KMH
 

But surprsing (and sad) to see 'bread and butter' MMIC's like the AMMC 5618 (HMMC5618) go obsololete - a part in 000's of COTS products - like the Alcatel units. And probably making repairs impossible, longer term, to a lot of HP/Agilent test gear that use many of the parts being discontinued.

Guess Analog/Hittite will take the market left by Broadcom.

73
Lehane
EA3/G8KMH

On 18/01/2018 20:31, Christopher Bartram cbartram@... [ukmicrowaves] wrote:
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone,
either. Other manufacturers have now deleted large chunks of their
microwave semiconductor lists, NEC and Mitsubishi amongst them. This is
generally a result of 'rationalisation' and the madness of the market
rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices
are now made by a very few specialised companies, and, of course, those
parts aren't cheap ...

73

Chris

GW4DGU




AVG logo

This email has been checked for viruses by AVG antivirus software.
www.avg.com




Re: Broadcom Obsolescence Notice

Christopher Bartram <cbartram@...>
 

I'm afraid that's the way of the world, folks. Broadcom aren't alone, either. Other manufacturers have now deleted large chunks of their microwave semiconductor lists, NEC and Mitsubishi amongst them. This is generally a result of 'rationalisation' and the madness of the market rules. Discrete GaASFETs, HEMTs etc., and particularly low-noise devices are now made by a very few specialised companies, and, of course, those parts aren't cheap ...

73

Chris

GW4DGU


Re: Broadcom Obsolescence Notice

g4bao
 

Blimey !

On 18 Jan 2018 19:11, "G3XDY g3xdy@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 

I'm sure many of you will have used HP/Agilent/Avago/Broadcom parts in
microwave projects. It looks like Broadcom is largely exiting this
market having announced the obsolescence of over 1000 parts including
GaAsFETS, MMICS, PIN Diodes, Schottky diodes etc. This notice lists the
parts affected:

https://docs.broadcom.com/docs/OBS120117WSD3

Last time buys are before June 2018 but I expect distributors will be
running down stocks before then. A great pity as there are many good
devices in the list and they were widely stocked by the major distributors.

73

John G3XDY

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Broadcom Obsolescence Notice

John Quarmby
 

I'm sure many of you will have used HP/Agilent/Avago/Broadcom parts in microwave projects. It looks like Broadcom is largely exiting this market having announced the obsolescence of over 1000 parts including GaAsFETS, MMICS, PIN Diodes, Schottky diodes etc. This notice lists the parts affected:

https://docs.broadcom.com/docs/OBS120117WSD3

Last time buys are before June 2018 but I expect distributors will be running down stocks before then. A great pity as there are many good devices in the list and they were widely stocked by the major distributors.

73

John G3XDY


Re: 50v 35amp psu

ed.murphy31@...
 

Hello Ian,

If it is still available, I would be interested.

Regards
Ed GM3SBC.


Re: 50v 35amp psu

Ian White
 

Speaking of which, is anyone in need of a 42V 55A supply? Cisco 34-1535-01. I'm never going to use it.

 

73 from Ian GM3SEK

 

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 17 January 2018 18:41
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] 50v 35amp psu

 




Chris

Pretty sure I have a spare 50V 1800VA ‘Telecoms’ battery charging regulated PSU. (that should be about 36A)

Eltek SMPS 1800SI

You are welcome to one ,  I will fish it out and test.. not been powered for a while.

I use one for my kW 2m amplifier.

 

Mark GM4ISM

 

 

 

Sent: Wednesday, January 17, 2018 5:49 PM

Subject: [ukmicrowaves] 50v 35amp psu

 

 

Has anyone got a 50v 35amp psu that they would like to sell

cheers GM4YLN





Re: 50v 35amp psu

Chris
 

that's great Mark let me know when I can come for it

cheers Chris


On 17/01/2018 18:41, gm4ism@... [ukmicrowaves] wrote:
 

Chris
Pretty sure I have a spare 50V 1800VA ‘Telecoms’ battery charging regulated PSU. (that should be about 36A)
Eltek SMPS 1800SI
You are welcome to one ,  I will fish it out and test.. not been powered for a while.
I use one for my kW 2m amplifier.
 
Mark GM4ISM
 
 
 
Sent: Wednesday, January 17, 2018 5:49 PM
Subject: [ukmicrowaves] 50v 35amp psu
 
 

Has anyone got a 50v 35amp psu that they would like to sell

cheers GM4YLN



Re: 50v 35amp psu

Mark GM4ISM
 

Chris
Pretty sure I have a spare 50V 1800VA ‘Telecoms’ battery charging regulated PSU. (that should be about 36A)
Eltek SMPS 1800SI
You are welcome to one ,  I will fish it out and test.. not been powered for a while.
I use one for my kW 2m amplifier.
 
Mark GM4ISM
 
 
 

Sent: Wednesday, January 17, 2018 5:49 PM
Subject: [ukmicrowaves] 50v 35amp psu
 
 

Has anyone got a 50v 35amp psu that they would like to sell

cheers GM4YLN