Date   

Re: Handy solution for 10GHz?

John G3UUT
 

Neil,

Thank you for telling us that, we all tend to try and keep this stuff bottled up and it doesn't do any good, you have my greatest sympathy and it's great that you are managing to keep something of a normal life going as well. My wife was diagnosed with Alzheimers almost exactly ten years ago now and is a long way down the road.  I know how difficult it is to keep all the balls in the air - it's been especially awful over the past lock downs (for you as well I'm sure) as I didn't want to risk carers coming in but things are now getting better again now we've been jabbed and carers are back.

Best wishes to you all
John G3UUT

On 19/06/2021 14:37, Neil Smith G4DBN wrote:
On 19/06/2021 12:26, Robin Szemeti - G1YFG wrote:
For 10G, I have ordered one of the "french" kits from Neil DBN, 

Hi folks, the reason I am abnormally quiet at the moment and my radio and machining work is very much curtailed is because Caroline is in the very last stage of her seven-year cancer journey. I am spending all my "spare" time carrying out nursing duties, monitoring oxygen levels and managing the household as her many friends and relatives come to see her for the "last" time.  She is a tough old boot and that "last" visit often gets repeated.  She has a PMR446 handheld with an alarm button so I don't need to be with her all the time, but her voice is now extremely weak, so if she wants to listen to music or podcasts or the radio, she bleeps me and whispers into the handheld, then I yell an Alexa command to get her Echo Dot to play whatever.  It works even if I am 150 metres away down in the antenna farm. Neighbours must be a bit alarmed at me shouting random stuff about Bach preludes from the dark depths of the woodland (Microwave absorber par excellence). Marvellous stuff, radio.

Sorry I haven't replied to many emails, normal service will be resumed once nature takes its course. I am radically sleep-deprived, so replying to emails is sometimes just too much. It's like when you have a new baby in the house, but it knows how to use a handheld rather than just bawling. Caroline is bored with the whole "dying" thing and wants it to be over, we've been on borrowed time for three or four years now, and it's hardly a shock that she won't be here much longer. The extra time has been a great gift. It is great that she gets to see her great-granddaughter regularly, I just hope Polly is old enough to remember her great-grandma.

I'm just waiting for a batch of septums to arrive from Ron G6BMY, then I'll start shipping the 10 GHz transverter kits. I've built three and they all work fine. I have a hundred cardboard boxes, posting bags, several reams of paper for the component sheets, schematic and layout, and a 30-page construction manual which is being proof-checked.  All that remains is cutting all those component tapes to length and Sellotaping them to the parts sheets.  Quite relaxing

I have a waiting list of two for any cancelled orders, but so far, the attrition rate is very low. If anyone is late to the party and wants to join the queue, you are welcome, but don't count any chickens... 

https://groups.io/g/BVA-transverters-uk

Same delays also apply to the F6BVA QO100 kits, I have almost all the parts now, but some are on very long back order, so I've had to make some substitutions.

I still have a few Wavelab interface and power/control PCBs to ship, and a fair few antenna feeds, roof-rack mast bearing clamps, SCAM spigots, 122 GHz, 76 GHz and 24 GHz parts and a heap of heatspreaders adn watercooling plates to complete and ship, plus some components for EME antenna mounts to get finished.

I'll send updates when there is news.

Neil G4DBN




Virus-free. www.avast.com


Dish choices for 10GHz.....

Gareth G4XAT
 

I've two dish solutions to pursue for 10GHz, a 65cm offset and a 60cm Prime focus.
I know 'back in the day' that a 'Penny Feed' was a popular solution on prime focus but which would be best now I'm wondering?
For the launcher I'm using SMA to WG16 with a small horn (for added gain?) or I imagine a 22mm Copper to SMA creation may be possible. I can design and fab/3-D print a bracket to mount that on the Offset dish arm, added benefit is that the TX and RX strips can be fitted directly underneath the arm so very short feeder runs involved.
Equally, the green dish is a lot lighter (alloy not steel) and easier to mount/aim but I'd need to feed from behind the dish. I've seen the G3PHO dual mode feed and a 'shepherds crook' adaptation that may work for me too. I also have a 12" piece of copper WG16 that may help.
Guidance and suggestions as to best route forwards please....I suspect that there may be a degree of 6 of one and 1/2 a doz. of the other involved, but thought I'd ask anyway.
I've also deigned a replacement LNB mount for a Sky Mini-dish, then another to mount a Titanium C band LNB on the same thing. If anyone would like the .stl files, just ask....
Pictures show....
Thanks
Gareth


Re: Handy solution for 10GHz?

Neil Smith G4DBN
 

On 19/06/2021 12:26, Robin Szemeti - G1YFG wrote:
For 10G, I have ordered one of the "french" kits from Neil DBN, 

Hi folks, the reason I am abnormally quiet at the moment and my radio and machining work is very much curtailed is because Caroline is in the very last stage of her seven-year cancer journey. I am spending all my "spare" time carrying out nursing duties, monitoring oxygen levels and managing the household as her many friends and relatives come to see her for the "last" time.  She is a tough old boot and that "last" visit often gets repeated.  She has a PMR446 handheld with an alarm button so I don't need to be with her all the time, but her voice is now extremely weak, so if she wants to listen to music or podcasts or the radio, she bleeps me and whispers into the handheld, then I yell an Alexa command to get her Echo Dot to play whatever.  It works even if I am 150 metres away down in the antenna farm. Neighbours must be a bit alarmed at me shouting random stuff about Bach preludes from the dark depths of the woodland (Microwave absorber par excellence). Marvellous stuff, radio.

Sorry I haven't replied to many emails, normal service will be resumed once nature takes its course. I am radically sleep-deprived, so replying to emails is sometimes just too much. It's like when you have a new baby in the house, but it knows how to use a handheld rather than just bawling. Caroline is bored with the whole "dying" thing and wants it to be over, we've been on borrowed time for three or four years now, and it's hardly a shock that she won't be here much longer. The extra time has been a great gift. It is great that she gets to see her great-granddaughter regularly, I just hope Polly is old enough to remember her great-grandma.

I'm just waiting for a batch of septums to arrive from Ron G6BMY, then I'll start shipping the 10 GHz transverter kits. I've built three and they all work fine. I have a hundred cardboard boxes, posting bags, several reams of paper for the component sheets, schematic and layout, and a 30-page construction manual which is being proof-checked.  All that remains is cutting all those component tapes to length and Sellotaping them to the parts sheets.  Quite relaxing

I have a waiting list of two for any cancelled orders, but so far, the attrition rate is very low. If anyone is late to the party and wants to join the queue, you are welcome, but don't count any chickens... 

https://groups.io/g/BVA-transverters-uk

Same delays also apply to the F6BVA QO100 kits, I have almost all the parts now, but some are on very long back order, so I've had to make some substitutions.

I still have a few Wavelab interface and power/control PCBs to ship, and a fair few antenna feeds, roof-rack mast bearing clamps, SCAM spigots, 122 GHz, 76 GHz and 24 GHz parts and a heap of heatspreaders adn watercooling plates to complete and ship, plus some components for EME antenna mounts to get finished.

I'll send updates when there is news.

Neil G4DBN



Re: Handy solution for 10GHz?

Robin Szemeti - G1YFG
 

For 10G, I have ordered one of the "french" kits from Neil DBN, I am not sure those 10G PCBs you used are still available on eBay? It was Bison electronics I think selling them in .PL?

On Sat, 19 Jun 2021 at 07:51, Maarten PA0MHE <maarten.heuvelman@...> wrote:
I made a kind of double conversion solution, with a first IF on 2419.2 MHz and second on 432 MHz. This with one single (ADF4351) LO on 1987.2 MHz. This LO is used as input to the LO1 x4 multiplier on the module resulting in 7948.8 MHz as first LO and the LO is used to convert down to 432.
Although I have a Pluto this solution is more interesting for me, still I used the Pluto and an ADF4351 module for a quick test and it delivers nearly 1W on 10368 MHz.

See here the IF part off the PCB I made, the other part is a ADF4351 with low noise supply but is straightforward.


This PCB replaces the original IF PCB and fits within the screening. The MCX_PCB connectors of the original IF PCB I intend to resuse on my PCB.

See the mixer and SWAF on the schematic I got from Chipbank (thanks to Mike). The 2 layer 100x85mm PCB is ordered yesterday from  JLCPCB.


'73 Maarten PA0MHE


--
Robin Szemeti - G1YFG


Re: Handy solution for 10GHz?

Maarten PA0MHE
 

I made a kind of double conversion solution, with a first IF on 2419.2 MHz and second on 432 MHz. This with one single (ADF4351) LO on 1987.2 MHz. This LO is used as input to the LO1 x4 multiplier on the module resulting in 7948.8 MHz as first LO and the LO is used to convert down to 432.
Although I have a Pluto this solution is more interesting for me, still I used the Pluto and an ADF4351 module for a quick test and it delivers nearly 1W on 10368 MHz.

See here the IF part off the PCB I made, the other part is a ADF4351 with low noise supply but is straightforward.


This PCB replaces the original IF PCB and fits within the screening. The MCX_PCB connectors of the original IF PCB I intend to resuse on my PCB.

See the mixer and SWAF on the schematic I got from Chipbank (thanks to Mike). The 2 layer 100x85mm PCB is ordered yesterday from  JLCPCB.


'73 Maarten PA0MHE


[camb-hams] 23cm Quad Loop Yagi for sale

John Worsnop
 

Please reply directly to g6ohm

---------- Forwarded message ---------
From: g6ohm@... via groups.io <g6ohm=talktalk.net@groups.io>
Date: Fri, 18 Jun 2021, 10:16
Subject: [camb-hams] 23cm Quad Loop Yagi for sale
To: Cam-Hams <camb-hams@groups.io>


For Sale

23cm Quad loop Yagi

48 element. 3.75 m long !

Breaks down into 1.8 m aprox sections

N type Socket.

60 pounds

Tel: 01354695186 have caller id. Just give your callsign.


Thanks

Andy Dunham G6OHM

Sysop of MB7IAD HUBNET Node 145.2875 mhz  CTCSS 94.8


Email: g6ohm@...
Website: http://g6ohm.webs.com/


Re: Handy solution for 10GHz?

Gareth G4XAT
 

Interesting Marten, more info gratefully received, I'm hoping to use a single LO and then adjust the RX and TX frequencies to suit the two filter passbands. As the Pluto will receive anywhere in that region it would make it very simple. I'd be interested to know how good the RX front end is in terms of gain/sensitivity/selectivity etc.For DATV RX the highest I can go is 2450MHz (minitiouner limit).
73
Gareth


Anyone on 13cms now?

Nick Gregory G0HIK
 

I'm monitoring 13cms now. I just need one more QSO to qualify this SOTA summit.
Am monitoring 2320.200 and KST.
Nick G0HIK/P IO84MG


Wanted Kuhne G4 3cm Transvereter

Clive Elliott GW4MBS
 

Wanted MKU 10 G4 PROF 3cm Transverter.

Production has just ceased & now superceded by G5 which has wider frequency coverage, more sophisticated, more facilities & firmware controlled :(

For those wanting to upgrade with all the new features of the G5 might like to consider selling their G4 to me!

Please contact me off site on PM or email
-- 
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Re: 9cm filter?

militaryoperator
 


Well interesting. Thanks to a load of an interdigital filter and a Minikits pcb filter from Mike G3LYP I think I need one. 

When I beam East the noise floor rises but with the filter, either one, inline the noise floor stays the same in all directions.

Unfortunately, Minikits.au no longer list one on their website. 

So, any ideas?

Ben G4BXD


Re: 10GHz WG transition

Alan Beard
 

Hi all,

I asked about the "T" bar transition a while back, has anybody tried a flat strip replacing the round cross bar?

Could somebody do a simulation to give use guidelines for a "simple to build" transition?

Alan VK2ZIW

On Fri, 11 Jun 2021 09:57:23 +0100, John Fell wrote
> Hi Alan,
> Probably but I have no data .
> At the low frequencies you quote I would use a conventional 1/4 wave dipole structure mounted on a suitable coaxial socket .For no tune expand the dipole diameter and it should give a wideband performance .
> Material mix could give you long term intermetallic issues in a damp environment .
>
> 73
> John
> G0API   
>
> On Fri, 11 Jun 2021 at 06:45, Alan Beard <beardal@...> wrote:
>

> Hi John,
>
>

> "T" bar, can the bar be replaced by a flat strip?
>
>

> Are there any simulations to give us some guidelines?
>
>

> I'm looking for "no tune" transitions for 1, 2 and 3GHz.
> Where the waveguide will be extruded aluminium and
> all the added bits will be brass with the coax soldered to them. 
> Also, to reduce the inductance where the "inner goes to the bar",
> bring the coax right into the waveguide, the coax outer being a larger
> diameter.
>
>

> I have a 3.5GHz "T" bar transition here from 1950 perhaps, beautifully made
> but a custom, never seen anywhere, coax connector.
> WG 2 3/8" x 1 1/8" or 60mm x 29mm and the bar 1/2" or 12.5mm 5/8" or 16mm
> from the back-short, 3/8 " or 10mm centre up from the WG broad face. 
> Thus the gap down to the broad face is about 4mm.
>
>

> Alan VK2ZIW
>
>

> On Thu, 10 Jun 2021 11:06:27 +0100, John Fell wrote
> > Fairy snuff .
> > It was based on one you made and I swopped for a T bar , rear of guide socket based thingy - long time ago .
> >
> > I also like the 3 stub /screw design using brass or copper plated brass screws for a more defined bandwidth .
> >
> > 73
> > John
> > G0API
> >
> > On Thu, 10 Jun 2021 at 10:48, Andy G4JNT <andy.g4jnt@...> wrote:
> >

> >
> > 'snot my design.    If I gave it to you,  'twould have been nicked from somewhere else. 
> > Remember decades ago hearing a rule of thumb along the lines of  "a fifth of a wavelength probe at a fifth of a wavelength from the back short".
> >
> > Andy
> > www.g4jnt.com
> >
> > On Thu, 10 Jun 2021 at 10:33, John Fell <john.g0api@...> wrote:
> >

> > Found this design by G4JNT just now .(see attached)
> > I have made several and they are easy to adjust using cross coupler and diode detector .
> >
> > The back short was milled from 1"x 1/2" Brass bar into a T section length and then cut into 1/2" lengths , providing a solid contact around the inner guide faces .
> >
> > The short is inserted partially and return loss measured - if required the short is squeezed further into the guide using a vice or thumped with a hammer and measurement repeated .
> >
> > As shown the socket is based on a flanged N type with extended spill.An SMA version is fine , with the spill extended using the outer of solid jacket cable to within a mm of the inner guide wall .
> >
> > 73
> > John
> > G0API
> >
> >

> >
> >

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


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


IO93 to IO80 10 GHz - an SSB contact for a change!

Neil Smith G4DBN
 

Nice surprise this evening, had a call on Zello from Adrian G4UVZ and we just had a ragchew on 10 GHz SSB at 56 each way over a 340 km path.

Big RS signals from GB3PKT, but I think too much drizzle between me and the big storms over the channel to hear F5ZTR

Neil G4DBN


Re: 6cm tests

militaryoperator
 

Hi Ben
GB3ZME/P is operational OK. In fact, it's been on 24/7 for more than 17 years, with only a single failure in 2014 (coax connector).
However, it is located in an un-insulated attic, so temp. up there must be boiling!
It does drift LF on such hot days.
73 Martyn G3UKV


Very odd in that case Martyn. I saw ZME when I was using the bi-quad indoors and with the panel inside the window, its in the picture below,  but nothing today despite a booming signal, stronger than the 9Cm beacon, from OHM. Very strange.

Hey ho, on with the tx side now. Will reverse the amps at 6Cm, see if I feed some 432 into the dbl bal mixer just how much comes out of it and then through the amps. 

Ben. 



On Wed, 16 Jun 2021 at 13:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Well, outdoor aerials do work better, hi. 

Best with indoor:

6cm-ant.jpg


With panel ant outdoors on pole and with new super LO: OHM beacon down to 70Cms

panel-osc.JPG

oddly though, can't hear Telford. Is it off?

Ben G4BXD


Virus-free. www.avg.com


Re: LibreVNA ?

Tim, VK2XAX
 

Hi Claudio,

Yep , I did see that but I thought I'd ask here and other groups to get more opinions :)

thanks

Tim


On 17/6/21 2:32 am, i2NDT via groups.io wrote:
hi Tim,
they have a dedicated group.io:

https://groups.io/g/LibreVNA

best 73
de
i2NDT Claudio
_

-- 
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA


Re: 6cm tests

Martyn G3UKV
 

Hi Ben
GB3ZME/P is operational OK. In fact, it's been on 24/7 for more than 17 years, with only a single failure in 2014 (coax connector).
However, it is located in an un-insulated attic, so temp. up there must be boiling!
It does drift LF on such hot days.
73 Martyn G3UKV

On 16/06/2021 16:30, militaryoperator via groups.io wrote:
Must be off. I saw it on the internal antenna as you can see in pic but not there today. 

Cheers, Ben. 


Not hearing GB3ZME down here today .Perhaps wandering in the heat ....
GB3OHM about 52 ave close to 5760.900MHz .

RX only on 6cm .

73
John
G0API
IO80XS77JR

On Wed, 16 Jun 2021 at 13:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Well, outdoor aerials do work better, hi. 

Best with indoor:

6cm-ant.jpg


With panel ant outdoors on pole and with new super LO: OHM beacon down to 70Cms


oddly though, can't hear Telford. Is it off?

Ben G4BXD


Virus-free. www.avg.com


Re: LibreVNA ?

i2NDT
 

hi Tim,
they have a dedicated group.io:

https://groups.io/g/LibreVNA

best 73
de
i2NDT Claudio


Re: Unused Unloved K2RIW Amp

Reg Woolley
 

Hi Alwyn I have seen 2 different amps for 2m recently for sale with a 3cx800. One had a soft tube. Other was working . Neither with a spare. I am not a betting man so did not even make an offer

Reg G8VHI 



Sent from my Samsung Galaxy S10e - Powered by Three


-------- Original message --------
From: "alwyn.seeds1" <a.seeds@...>
Date: 16/06/2021 15:13 (GMT+00:00)
To: "UK Microwaves groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Unused Unloved K2RIW Amp

Dear Reg,

Yes, I have seen that the Eimac 3CX800A7s are now $1,200 each plus shipping, VAT and import charges.

The NOS batch I bought were a bit cheaper, but scarcely cheap.

Thus,  the impolite expression I uttered when I destroyed my first one by not using the heaters only conditioning trick

 reflected the pain to my wallet, as well as my surprise as I dodged the jet of flaming nichrome from the safety resistor.

Taught me a lesson, that I will not forget.

Anyone have recent experience of the Chinese ones sold under multiple brands including Thomson CSF?

Regards,

Alwyn



_____________________________________________________

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
_____________________________________________________


Re: 6cm tests

militaryoperator
 
Edited

Must be off. I saw it on the internal antenna as you can see in pic but not there today. 

Cheers, Ben. 


Not hearing GB3ZME down here today .Perhaps wandering in the heat ....
GB3OHM about 52 ave close to 5760.900MHz .

RX only on 6cm .

73
John
G0API
IO80XS77JR

On Wed, 16 Jun 2021 at 13:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Well, outdoor aerials do work better, hi. 

Best with indoor:

6cm-ant.jpg


With panel ant outdoors on pole and with new super LO: OHM beacon down to 70Cms


oddly though, can't hear Telford. Is it off?

Ben G4BXD


Re: 6cm tests

John Fell
 

Not hearing GB3ZME down here today .Perhaps wandering in the heat ....
GB3OHM about 52 ave close to 5760.900MHz .

RX only on 6cm .

73
John
G0API
IO80XS77JR

On Wed, 16 Jun 2021 at 13:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Well, outdoor aerials do work better, hi. 

Best with indoor:

6cm-ant.jpg


With panel ant outdoors on pole and with new super LO: OHM beacon down to 70Cms

panel-osc.JPG

oddly though, can't hear Telford. Is it off?

Ben G4BXD


Re: Unused Unloved K2RIW Amp

alwyn.seeds1
 

Dear Derek,

If it’s solid copper that’s a real Rolls Royce kit.

I have a lot of NOS 4CX250Bs collected over the years.

STC and MoV made them in the UK and they were excellent quality.

I either need to get one of my old PAs going, or let them go.

Moving to IO93 you’ll find the challenge of getting across the North Sea very different from life in JO03.

I hope you’re moving to a nice hill-top.

Look forward to working you on 70cm.

I have few QSOs on that band except in contests and it has superb tropo. characteristics.

Regards,

Alwyn G8DOH

_____________________________________________________

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
_____________________________________________________

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