Date   

Re: Balanced 90 degree hybrid

Andy G4JNT
 

Need to elaborate a bit more on the 90° hybrid:

The classic lumped 90° hybrid is two caps of 2.Zo across the inputs, and a bifilar wound dual L of Zo in series with each leg - good for 10% bandwidth in an I/Q converter.   Two ports in, two out, one terminated.
But I can't visualise a balanced version of this.  Four inputs - fine.   But how to work with the four outputs?



On Wed, 2 Dec 2020 at 09:13, Mark GM4ISM via groups.io <gm4ism=blueyonder.co.uk@groups.io> wrote:

you could always add a 90 deg phase shifter in one leg. The lumped component solution to this wont be as wideband  as purists may like but should work fine..   3 extra components,  a Pi Low pass network with inductor and capacitors reactance equal  to Zo  gives 90 deg phase shift. Other phase shifts available  retaining Zo in and out with different component values

Very useful at low frequencies where a 1/4 wave cable is not practical


Mark GM4ISM

On 02/12/2020 08:59, Andy G4JNT wrote:
Looking to design a better network to go on the output of a quad downconverter chip.    These devices have differential outputs for I and Q, so essential 0/90/180/270° ports

Simplest in concept is to use two 1:1 transformers, then combine the outputs in a single 90° hybrid. And this works well enough;  I use it on my QO100 second downconverter from 739.00005MHz to 28MHz.   

But it must be possible to do it the other way, a balanced 90° hybrid followed by a single transformer (or some other type of stage with balanced input).

Can I just double-up on the components for a single discrete 90° hybrid, in which case what changes are needed to counter the double phase shift?

Must be getting old; thinking through this sort of conundrum wasn't a problem 20 years go :-(



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Re: Balanced 90 degree hybrid

Andy G4JNT
 

A better solution than that would be a high pass and low pass 45° solution in each leg - 6 components in all.   That will give a broader bandwidth for 90° overall



On Wed, 2 Dec 2020 at 09:13, Mark GM4ISM via groups.io <gm4ism=blueyonder.co.uk@groups.io> wrote:

you could always add a 90 deg phase shifter in one leg. The lumped component solution to this wont be as wideband  as purists may like but should work fine..   3 extra components,  a Pi Low pass network with inductor and capacitors reactance equal  to Zo  gives 90 deg phase shift. Other phase shifts available  retaining Zo in and out with different component values

Very useful at low frequencies where a 1/4 wave cable is not practical


Mark GM4ISM

On 02/12/2020 08:59, Andy G4JNT wrote:
Looking to design a better network to go on the output of a quad downconverter chip.    These devices have differential outputs for I and Q, so essential 0/90/180/270° ports

Simplest in concept is to use two 1:1 transformers, then combine the outputs in a single 90° hybrid. And this works well enough;  I use it on my QO100 second downconverter from 739.00005MHz to 28MHz.   

But it must be possible to do it the other way, a balanced 90° hybrid followed by a single transformer (or some other type of stage with balanced input).

Can I just double-up on the components for a single discrete 90° hybrid, in which case what changes are needed to counter the double phase shift?

Must be getting old; thinking through this sort of conundrum wasn't a problem 20 years go :-(



Virus-free. www.avg.com


Re: Balanced 90 degree hybrid

Mark GM4ISM
 

you could always add a 90 deg phase shifter in one leg. The lumped component solution to this wont be as wideband  as purists may like but should work fine..   3 extra components,  a Pi Low pass network with inductor and capacitors reactance equal  to Zo  gives 90 deg phase shift. Other phase shifts available  retaining Zo in and out with different component values

Very useful at low frequencies where a 1/4 wave cable is not practical


Mark GM4ISM

On 02/12/2020 08:59, Andy G4JNT wrote:
Looking to design a better network to go on the output of a quad downconverter chip.    These devices have differential outputs for I and Q, so essential 0/90/180/270° ports

Simplest in concept is to use two 1:1 transformers, then combine the outputs in a single 90° hybrid. And this works well enough;  I use it on my QO100 second downconverter from 739.00005MHz to 28MHz.   

But it must be possible to do it the other way, a balanced 90° hybrid followed by a single transformer (or some other type of stage with balanced input).

Can I just double-up on the components for a single discrete 90° hybrid, in which case what changes are needed to counter the double phase shift?

Must be getting old; thinking through this sort of conundrum wasn't a problem 20 years go :-(



Virus-free. www.avg.com


Balanced 90 degree hybrid

Andy G4JNT
 

Looking to design a better network to go on the output of a quad downconverter chip.    These devices have differential outputs for I and Q, so essential 0/90/180/270° ports

Simplest in concept is to use two 1:1 transformers, then combine the outputs in a single 90° hybrid. And this works well enough;  I use it on my QO100 second downconverter from 739.00005MHz to 28MHz.   

But it must be possible to do it the other way, a balanced 90° hybrid followed by a single transformer (or some other type of stage with balanced input).

Can I just double-up on the components for a single discrete 90° hybrid, in which case what changes are needed to counter the double phase shift?

Must be getting old; thinking through this sort of conundrum wasn't a problem 20 years go :-(



Tayloe mixer, ICs on a board

Alan Beard
 

Hi guys,
Can anybody point me to a small Tayloe mixer board with
just the 4way mux chip and the 90deg. clock divider chip on it?
Anything with an xxxx3253 chip on it. I'll do the op-amp and
phasing SSB caps and resistors on a bread-board.

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


Re: Modifying a POTY dish feed

Andrew G8TZJ
 

Thanks for the comments. I'll report back in due course.

73 Andrew G8TZJ


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Clint Sharp <cjaysharp@...>
 

Also happy to help with SMD work/rework.


On Tue, 1 Dec 2020 at 13:51, Robin Szemeti - G1YFG <robin@...> wrote:
I would just add, that if you want me to scrape that one off the board and mount a fresh one, just let me know. It looks like it is not a particularly small package, 3mm x 2mm ans 8 legs, so should be easy enough.

On Tue, 1 Dec 2020 at 13:49, Robin Szemeti <robin@...> wrote:
Ah noted, then yes indeed, the Chinese eBay optio makes sense.

On Tue, 1 Dec 2020 at 11:35, Clint Sharp <cjaysharp@...> wrote:
My motivation to order from ebay would be that you get them mounted on a board complete with sockets and ready to use.

I quite like being able to lash up test setups from a pile of modules before I commit to spinning a board. 



On Tue, 1 Dec 2020, 10:17 Robin Szemeti - G1YFG, <robin@...> wrote:
I'm just slightly baffled why anyone would order from eBay and wait 2 months when mouser.co.uk has them in stock ... for less than a fiver.

On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG



--
Clint. M0UAW IO83

No trees were harmed in the sending of this mail. However, a large number of electrons were greatly inconvenienced.


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Robin Szemeti - G1YFG
 

I would just add, that if you want me to scrape that one off the board and mount a fresh one, just let me know. It looks like it is not a particularly small package, 3mm x 2mm ans 8 legs, so should be easy enough.

On Tue, 1 Dec 2020 at 13:49, Robin Szemeti <robin@...> wrote:
Ah noted, then yes indeed, the Chinese eBay optio makes sense.

On Tue, 1 Dec 2020 at 11:35, Clint Sharp <cjaysharp@...> wrote:
My motivation to order from ebay would be that you get them mounted on a board complete with sockets and ready to use.

I quite like being able to lash up test setups from a pile of modules before I commit to spinning a board. 



On Tue, 1 Dec 2020, 10:17 Robin Szemeti - G1YFG, <robin@...> wrote:
I'm just slightly baffled why anyone would order from eBay and wait 2 months when mouser.co.uk has them in stock ... for less than a fiver.

On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Robin Szemeti - G1YFG
 

Ah noted, then yes indeed, the Chinese eBay optio makes sense.

On Tue, 1 Dec 2020 at 11:35, Clint Sharp <cjaysharp@...> wrote:
My motivation to order from ebay would be that you get them mounted on a board complete with sockets and ready to use.

I quite like being able to lash up test setups from a pile of modules before I commit to spinning a board. 



On Tue, 1 Dec 2020, 10:17 Robin Szemeti - G1YFG, <robin@...> wrote:
I'm just slightly baffled why anyone would order from eBay and wait 2 months when mouser.co.uk has them in stock ... for less than a fiver.

On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Clint Sharp <cjaysharp@...>
 

My motivation to order from ebay would be that you get them mounted on a board complete with sockets and ready to use.

I quite like being able to lash up test setups from a pile of modules before I commit to spinning a board. 



On Tue, 1 Dec 2020, 10:17 Robin Szemeti - G1YFG, <robin@...> wrote:
I'm just slightly baffled why anyone would order from eBay and wait 2 months when mouser.co.uk has them in stock ... for less than a fiver.

On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian


--
Robin Szemeti - G1YFG


Re: UKuG 2021 Contests - Some ideas for slight improvements

Robin Szemeti - G1YFG
 

I very much like the "microwave field day" idea.



On Tue, 1 Dec 2020 at 10:27, G1DFL via groups.io <peterdwberkshire=yahoo.com@groups.io> wrote:
Hi John,

I'm re-sending to you my ideas for slight improvements to the UKuG Calendar for 2021, and CC'ing the wider community to see if anyone else wants to suggest some changes, before the final 2021 calendar is agreed by the community and published on the UKuG website.

1) Adding 122GHz to the same day as 24/74/76GHz. So not just activity days but contests with same rules as the other bands that day. 

2) Adding an extra 24/47/76/122GHz session so we have 4 Sunday's to play in 2021. For the 4th session, I'd like to suggest either:

               - Sunday 28th March (to make use of the colder less humid weather), or
               - Sunday 15th August (a summer alternative).

3) Also, is there any chance that we can harmonise the 10GHz rules so they are the same as 5GHz.  On 5GHz there is a single "ALL" section and stations can rove. On 10GHz can you make this the same please (so remove Low Power so its just "ALL" and remove the restriction currently not allowing roving with >1W). Many /P stations like to rove with both bands, so it would make sense for the rules for that day to be more consistent on both bands.

4) In 2020 there were various "Activity Weekends" coloured green on the UKuG 2020 calendar. No one knew what they were?!  I would just get rid of them, or just make them the Sunday, unless there is some guidance on how to take advantage of them??  Were we all supposed to get the gear out and concentrate some casual activity? 

5) I'd love for UKuG to brig back a "Microwave Field Day" in the summer. Just a Sunday when we can choose our bands and just ALL come on, maybe for a natter, maybe to exchange stuff like contest details or postcode or our UKuG membership number if we were all given one (a bit like the WAB book number). ...Just a lovely summers day to get all of the UK on GHz playing radio and publicise what we do across email, Twitter, Fbook etc to get more Hams interested and experimenting - and off HF!  Just an idea for a day to increase activity outside of contests. Maybe a chance for clubs to introduce newcomers to GHz, if we ever get back to what normal was like and not just solo portable! If the Sunday 15th August is not used in 2) above, I would suggest that date.

Thanks for all the stuff you and the UKuG C'tee do for us.


Regards....Pete
G1DFL


--
Robin Szemeti - G1YFG


UKuG 2021 Contests - Some ideas for slight improvements

G1DFL
 

Hi John,

I'm re-sending to you my ideas for slight improvements to the UKuG Calendar for 2021, and CC'ing the wider community to see if anyone else wants to suggest some changes, before the final 2021 calendar is agreed by the community and published on the UKuG website.

1) Adding 122GHz to the same day as 24/74/76GHz. So not just activity days but contests with same rules as the other bands that day. 

2) Adding an extra 24/47/76/122GHz session so we have 4 Sunday's to play in 2021. For the 4th session, I'd like to suggest either:

               - Sunday 28th March (to make use of the colder less humid weather), or
               - Sunday 15th August (a summer alternative).

3) Also, is there any chance that we can harmonise the 10GHz rules so they are the same as 5GHz.  On 5GHz there is a single "ALL" section and stations can rove. On 10GHz can you make this the same please (so remove Low Power so its just "ALL" and remove the restriction currently not allowing roving with >1W). Many /P stations like to rove with both bands, so it would make sense for the rules for that day to be more consistent on both bands.

4) In 2020 there were various "Activity Weekends" coloured green on the UKuG 2020 calendar. No one knew what they were?!  I would just get rid of them, or just make them the Sunday, unless there is some guidance on how to take advantage of them??  Were we all supposed to get the gear out and concentrate some casual activity? 

5) I'd love for UKuG to brig back a "Microwave Field Day" in the summer. Just a Sunday when we can choose our bands and just ALL come on, maybe for a natter, maybe to exchange stuff like contest details or postcode or our UKuG membership number if we were all given one (a bit like the WAB book number). ...Just a lovely summers day to get all of the UK on GHz playing radio and publicise what we do across email, Twitter, Fbook etc to get more Hams interested and experimenting - and off HF!  Just an idea for a day to increase activity outside of contests. Maybe a chance for clubs to introduce newcomers to GHz, if we ever get back to what normal was like and not just solo portable! If the Sunday 15th August is not used in 2) above, I would suggest that date.

Thanks for all the stuff you and the UKuG C'tee do for us.


Regards....Pete
G1DFL


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Robin Szemeti - G1YFG
 

I'm just slightly baffled why anyone would order from eBay and wait 2 months when mouser.co.uk has them in stock ... for less than a fiver.

On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian


--
Robin Szemeti - G1YFG


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Michael Scott
 

Hi Andy

If you are referring to the IAM82008, according to the data sheet it is OK to 5 GHz. We still have a few of them left in the Chipbank stock.

73, Mike, G3LYP.


On 30/11/2020 20:09, Andy G4JNT wrote:
The MIcrowave components service has an active mixer, same topology as the ADL5350 - it was used for a 2.4GHz upconverter for QO-100.   Not sure if it goes to 4GHz though.   



Virus-free. www.avg.com

On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Adrian G4UVZ
 

Thanks Andy ..it is for a Q100 application ..I will see if Mike still has any in stock

A


Re: 23cm interference

Robin Szemeti - G1YFG
 

A good tip is have a listen in AM .. the 50Hz buzz of an SMPS is often readily apparent.


On Mon, 30 Nov 2020 at 21:17, Dave - G4RQI <io93ir@...> wrote:
Hello... sorry for the delay in replying. I will go out and look for it probably in the new year. For now it’s just an annoyance, maybe if I’m lucky it’ll go faulty

Thanks for looking

David - G4RQI


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of David Redman <davidredmang4idr@...>
Sent: Wednesday, November 11, 2020 11:40:55 AM
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 23cm interference
 
Hi David
No sign of the signal here on any 55el beam heading
Must be fairly local to you
No idea what it is , can you drive around / M 

( Any yes the RX is working GB3MHZ is its usual strength )
 
Dave
G4IDR
IO93BP


--
Robin Szemeti - G1YFG


Re: 23cm interference

Dave - G4RQI
 

Hello... sorry for the delay in replying. I will go out and look for it probably in the new year. For now it’s just an annoyance, maybe if I’m lucky it’ll go faulty

Thanks for looking

David - G4RQI


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of David Redman <davidredmang4idr@...>
Sent: Wednesday, November 11, 2020 11:40:55 AM
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 23cm interference
 
Hi David
No sign of the signal here on any 55el beam heading
Must be fairly local to you
No idea what it is , can you drive around / M 

( Any yes the RX is working GB3MHZ is its usual strength )
 
Dave
G4IDR
IO93BP


Re: Battery

Alan Beard
 

Hi Bill,

If your looking at LiPo batteries in the 18650 format 18mm dia. 65mm long,
be wary, the MAX that genuine manufacturers can do in this size is around 4000mAh.

The batch of 10000mAh cells I bought did at max, 200mAh !!!!
Only use, practising welding the tabs on.

Yes, NiCd and NiMh AA batteries went from 500mAh to 2800mAh over the years,
don't expect LiPo to do a five times improvement.

Alan VK2ZIW

On Sun, 29 Nov 2020 06:00:47 -0800, Bill Hill, M1BKF wrote
> I've seen batteries which were the brand "8000mah", actual capacity not stated...

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


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Andy G4JNT
 

It's the AMCY-1228H-1FU   reviewed in Sept 2013 Scatterpoint, page 14.




Virus-free. www.avg.com


On Mon, 30 Nov 2020 at 20:09, Andy Talbot <andy.g4jnt@...> wrote:
The MIcrowave components service has an active mixer, same topology as the ADL5350 - it was used for a 2.4GHz upconverter for QO-100.   Not sure if it goes to 4GHz though.   



Virus-free. www.avg.com

On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian


Re: ADL5350 Module Low Frequency 10Mhz-4GHz high-linearity Mixer RF / IF / LO Port

Andy G4JNT
 

The MIcrowave components service has an active mixer, same topology as the ADL5350 - it was used for a 2.4GHz upconverter for QO-100.   Not sure if it goes to 4GHz though.   



Virus-free. www.avg.com


On Mon, 30 Nov 2020 at 19:42, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
A friend has just received, after 2 months wait,  a faulty mixer from Ebay. Before he re-orders does anyone have a surplus working mixer?

Adrian

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