Date   

Re: Re fixing cores

Dave
 

Thanks Chris,
Yes, think I remember it in the distant past. 
73
Dave G4GLT. 


On 22 May 2021, at 10:54, Chris via groups.io <chris.yln@...> wrote:



what I use is I don't know what it is called,its the thin stretchy thread ,I unwrap it and use the thin elastic core

Chris GM4YLN



Virus-free. www.avg.com


Re: Re fixing cores

Chris
 

what I use is I don't know what it is called,its the thin stretchy thread ,I unwrap it and use the thin elastic core

Chris GM4YLN



Virus-free. www.avg.com


Re: How to get ahold of G4DDK?

 

Hi Sam,
Found email, Sending message now.
Thanks
Dave
VE7HR

On Fri, May 21, 2021 at 2:47 PM SAM JEWELL via groups.io <jewell=btinternet.com@groups.io> wrote:
Can I help?
Sam



On 21 May 2021, at 22:39, Dave Miller <ve7hr@...> wrote:

Trying to order a Preamp kit from him.
Link on website for contact information goes to his list of products.
Thanks
Dave
VE7HR (AT) VE7HR DOT CA



--
72 de Dave
VE7HR


Re: How to get ahold of G4DDK?

SAM JEWELL
 

Can I help?
Sam



On 21 May 2021, at 22:39, Dave Miller <ve7hr@...> wrote:

Trying to order a Preamp kit from him.
Link on website for contact information goes to his list of products.
Thanks
Dave
VE7HR (AT) VE7HR DOT CA


How to get ahold of G4DDK?

 

Trying to order a Preamp kit from him.
Link on website for contact information goes to his list of products.
Thanks
Dave
VE7HR (AT) VE7HR DOT CA


Re: Re fixing cores

Dave
 

Thanks to everyone who has replied. All very helpful.
73
Dave G4GLT.

On 21 May 2021, at 18:13, R Hopkins via groups.io <gw4nos=btinternet.com@groups.io> wrote:

I use Core Locking compound made by Rocol.

It looks like it's silicon based. It's sticky and doesn't harden. Can't tell you where to get it
though. I bought mine in a rally in the early eighties.


Roger GW4NOS


On Fri, 21 May 2021 16:48:28 +0100, you wrote:

I wonder what people use to fix cores such as the in the oscillator coils of DB6NT transverters. The brass core in my 5.7 ghz transverter is rather loose ( not good for a portable station) and I have seen wax mentioned on U tube but I would have thought that things like thin cotton are likely to lock and pre unpredictable.
73
Dave G4GLT.









FW: Rare locator expedition in Britany

Ralph
 

It has been requested by Jean-Paul F5AYE

 

Good luck

 

73

Ralph G4ALY

 

Sent from Mail for Windows 10

 

From: f5aye
Sent: 21 May 2021 18:04
To: EA1DDU Domi; EA1DQE Ruben; G4ALY Ralph; G4DBN Neil; G4NNS Brian
Subject: Rare locator expedition in Britany

 

Hi everybody, opportunity to make IN78 on 144, 432, 1296 and 10368 MHz

(10368 is new and not in the band plan but will be active with 60 cm and

3 W).

 

Informations here : https://tm6kjs.f6kjs.fr/en/home/

 

Please can you forward to your friends active on VHF to microwaves.

 

73 Jean-Paul F5AYE

 

 

 

--

L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.

https://www.avast.com/antivirus

 

 


Re: Re fixing cores

R Hopkins
 

I use Core Locking compound made by Rocol.

It looks like it's silicon based. It's sticky and doesn't harden. Can't tell you where to get it
though. I bought mine in a rally in the early eighties.


Roger GW4NOS

On Fri, 21 May 2021 16:48:28 +0100, you wrote:

I wonder what people use to fix cores such as the in the oscillator coils of DB6NT transverters. The brass core in my 5.7 ghz transverter is rather loose ( not good for a portable station) and I have seen wax mentioned on U tube but I would have thought that things like thin cotton are likely to lock and pre unpredictable.
73
Dave G4GLT.




Wolfspeed CGHV59070 70W 50V 6cm GaN HEMT

Neil Smith G4DBN
 

Has anyone played with the CGHV59070 GaN devices? They look relatively easy to match because of running at 50V, and make serious power on 6cm for about £250.

Gain and power are falling off by the time you get to 5760, but should still do around 70W CW with 13dB gain, so perhaps 3.5W input. Pulse rating is typically 100W at 5.4 GHz.

I've ordered one for the giggles. Given their niceness, it would be rude not to, wouldn't it? OK, I could probably find a pair of 20 year old Gasfets to get the same power, but even second-hand they are going to cost more than the new device, and have way less gain.

https://www.wolfspeed.com/downloads/dl/file/id/875/product/568/cghv59070.pdf

I have a huge pile of other projects to finish first, obviously, but given the state of the semiconductor industry, I wanted to have one in my parts box while I can buy them.

Fingers crossed I pass the EAR test again.  A pair of these would be mightily loud, wouldn't they?

Right, time to get back to the machine shop to make more Radio Things after a hard day at the infosec coal face.

Neil G4DBN


Re: Re fixing cores

geoffrey pike
 

A piece of an old thin elastic band,or thin ptfe as suggested
Geoff
GI0GDP

On Friday, 21 May 2021, 16:48:43 BST, Dave via groups.io <davidnewman55@...> wrote:


I wonder what people use to fix cores such as the in the oscillator coils of DB6NT transverters. The brass core in my 5.7 ghz transverter is rather loose ( not good for a portable station) and I have seen wax mentioned on U tube but I would have thought that things like thin  cotton are likely to lock and pre unpredictable.
73
Dave G4GLT.






Re: Re fixing cores

Dave
 

Thanks Andy. 


On 21 May 2021, at 16:50, Andy G4JNT <andy.g4jnt@...> wrote:


Plumbers PTFE tape



On Fri, 21 May 2021 at 16:48, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
I wonder what people use to fix cores such as the in the oscillator coils of DB6NT transverters. The brass core in my 5.7 ghz transverter is rather loose ( not good for a portable station) and I have seen wax mentioned on U tube but I would have thought that things like thin  cotton are likely to lock and pre unpredictable.
73
Dave G4GLT.






Re: Re fixing cores

Andy G4JNT
 

Plumbers PTFE tape



On Fri, 21 May 2021 at 16:48, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
I wonder what people use to fix cores such as the in the oscillator coils of DB6NT transverters. The brass core in my 5.7 ghz transverter is rather loose ( not good for a portable station) and I have seen wax mentioned on U tube but I would have thought that things like thin  cotton are likely to lock and pre unpredictable.
73
Dave G4GLT.






Re fixing cores

Dave
 

I wonder what people use to fix cores such as the in the oscillator coils of DB6NT transverters. The brass core in my 5.7 ghz transverter is rather loose ( not good for a portable station) and I have seen wax mentioned on U tube but I would have thought that things like thin cotton are likely to lock and pre unpredictable.
73
Dave G4GLT.


Re: 6cm rf?

militaryoperator
 

Found one on ebay, £26 from China or £30 from Amazon. 
I blew up two of those, so treat them *very* gently. They usually have  a pair of the same 5mm square devices that everything uses.  In the end, I fixed a slab of aluminium over the top of the chips to press them down to a bigger heatsink and help remove more heat from the package. I also scrapped the noisy switchmode regulator and used a two-stage linear regulator
Neil G4DBN


OK Neil. I see the Kuhne unit uses the SE5005 in the o/p, (£1.06 at digikey!) but limits it to 250mw o/p.

Ben


Looking for SMA male to SMA female pigtail

Andy
 

I'll try here first before buying the bits and making my own or buying something dodgy from eBay.....

I'm looking for a flexible patch lead about 50cms long for use on 13cms at low(ish) powers, currently 2W but doubt it will ever see more than 25W. 

SMA straight male on one end and SMA straight female on the other end in RG-400 or something similarly flexible with the same or lower loss.

Contact me off list if you have something suitable to discuss costs/postage etc. 

Thanks,
Andy
MM0FMF


Re: 6cm rf?

Neil Smith G4DBN
 

On 21/05/2021 13:12, militaryoperator via groups.io wrote:

Found one on ebay, £26 from China or £30 from Amazon. 

I blew up two of those, so treat them *very* gently. They usually have  a pair of the same 5mm square devices that everything uses.  In the end, I fixed a slab of aluminium over the top of the chips to press them down to a bigger heatsink and help remove more heat from the package. I also scrapped the noisy switchmode regulator and used a two-stage linear regulator

Neil G4DBN




Re: 6cm rf?

militaryoperator
 

Hi Ben,
Have you looked at the FPV booster amps for drones?, i used these on 5.8 GHz Analogue ATV from memory they use
a pair of devices and achieve 4 Chinese watts
cheers
Geoff
GI0GDP


Found one on ebay, £26 from China or £30 from Amazon. 


Re: SMD, ah!.

Andy
 

Donate the surplus to the Microwave Group chip bank.


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of militaryoperator via groups.io <Military1944@...>
Sent: Friday, May 21, 2021 4:28 AM
To: ukmicrowaves@groups.io <ukmicrowaves@groups.io>
Subject: [UKMicrowaves] SMD, ah!.
 
Well, SMD might make the pcb's smaller but not on the paperwork packing side.

Just ordered a few bits from Digikey, box arrived, each component in a plastic sealed bag, big bag, and must have misread, thought I'd ordered 10 100pf caps, seems they are in x5 units, so now have 50 of them! on a large reel of audio reel to reel days.

Plus two large printouts of the parts with rows of facts and figures, bar codes, place of manufacture etc etc. 

Just need to wait for boards for W1GHZ for preamp and pa amp then I can start the gluing, hi.

Ben.


Re: SMD, ah!.

Andy G4JNT
 

When I replaced my stock of 100nF 0805 caps, I ordered 1000.   It had taken about 10 years to get through the last lot, of which I think I'd ordered 500 back then.   But they get used up faster now.

This lot might just last me out :-(
 


On Fri, 21 May 2021 at 12:28, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Well, SMD might make the pcb's smaller but not on the paperwork packing side.

Just ordered a few bits from Digikey, box arrived, each component in a plastic sealed bag, big bag, and must have misread, thought I'd ordered 10 100pf caps, seems they are in x5 units, so now have 50 of them! on a large reel of audio reel to reel days.

Plus two large printouts of the parts with rows of facts and figures, bar codes, place of manufacture etc etc. 

Just need to wait for boards for W1GHZ for preamp and pa amp then I can start the gluing, hi.

Ben.


SMD, ah!.

militaryoperator
 

Well, SMD might make the pcb's smaller but not on the paperwork packing side.

Just ordered a few bits from Digikey, box arrived, each component in a plastic sealed bag, big bag, and must have misread, thought I'd ordered 10 100pf caps, seems they are in x5 units, so now have 50 of them! on a large reel of audio reel to reel days.

Plus two large printouts of the parts with rows of facts and figures, bar codes, place of manufacture etc etc. 

Just need to wait for boards for W1GHZ for preamp and pa amp then I can start the gluing, hi.

Ben.

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