Date   

Crystal holder type

Michael Scott
 

Hi All

Does anyone know the correct designation for a crystal holder which looks like HC49U but is smaller, the dimensions being 8mmx7mmx2mm HxWxD. The Chipbank has a lot this size and although I have Googled various descriptions, I haven't found a specification. Presumably somwhere there is a table of crystal case sizes and specifications as there is for capacitors etc., but I can't find it. Crystal cases brings up DVD cases and jewellery items but nothing electronic!

73, Mike, G3LYP.


Re: Baofeng UV-5R output on 10GHz

Andy G4JNT
 

If you want a weak test source at 10Ghz, why not buy yourself a cheap crystal oscillator at 48MHz and connect it to a Schottky diode as a multiplier.   Calibrate the frequency against a beacon.    Bog standard oscillators run at a few quid each.
Picking a couple at random 15 and 20ppm  accuracy

Or go for a 2PPM 38.4MHz (* 270 = 10368MHz) costing a whopping 87p

Mind you, 2PPM is still 20kHz uncertainty on 10GHz.



Virus-free. www.avg.com


On Sat, 16 Jan 2021 at 12:45, Andy Talbot <andy.g4jnt@...> wrote:
You had me intrigued so went and tried mine - tuned to 432.0125

There's a disgusting sounding strong poor quality note at 10368.091 MHz to be found when I place the unsquelched Baofeng near the radio.   The actual RF out of the radio measured as 432.0125137 MHz, which is remarkably good  sub-1ppm accuracy.



Virus-free. www.avg.com

On Sat, 16 Jan 2021 at 12:18, Clive Elliott GW4MBS via groups.io <humber1ton=btinternet.com@groups.io> wrote:
I know some of us use the Baofeng UV-5R 2m/70cm hand-held as a signal marker on 10GHz due to the 24th harmonic of the RX LO highlighted in this article:

https://destevez.net/2016/07/phase-noise-of-a-baofeng-uv-5r-10ghz-signal/

When tuned to 432.0125 it gave me a remarkably stable signal on 10368.22 with a GPS locked Kuhne. When I have been able to go portable the rig calibration was verified by two beacons.

Back home in the valley I am stuck as we have no beacons in Wales so I am reliant on the Baofeng for reassurance that things still work & are on frequency. During heavy rain I can usually hear GB3KBQ & sometimes GB3SCX, unfortunately we have had no useful rain for many weeks nor have I caught a whisper of the two beacons by AS.

Somehow I messed up the settings on the Baofeng so in desperation I did a reset. But immediately after doing that I find the 432.0125 RX output has moved down to 10368.145. I have reset this several times but get the same result.

So my question is, what frequency output on 10GHz do others get when using the Baofeng in this way? Is it giving the "correct" frequency in it's present state or was my earlier set up correct & I have reset it up wrongly?
--
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Re: Baofeng UV-5R output on 10GHz

Andy G4JNT
 

You had me intrigued so went and tried mine - tuned to 432.0125

There's a disgusting sounding strong poor quality note at 10368.091 MHz to be found when I place the unsquelched Baofeng near the radio.   The actual RF out of the radio measured as 432.0125137 MHz, which is remarkably good  sub-1ppm accuracy.



Virus-free. www.avg.com


On Sat, 16 Jan 2021 at 12:18, Clive Elliott GW4MBS via groups.io <humber1ton=btinternet.com@groups.io> wrote:
I know some of us use the Baofeng UV-5R 2m/70cm hand-held as a signal marker on 10GHz due to the 24th harmonic of the RX LO highlighted in this article:

https://destevez.net/2016/07/phase-noise-of-a-baofeng-uv-5r-10ghz-signal/

When tuned to 432.0125 it gave me a remarkably stable signal on 10368.22 with a GPS locked Kuhne. When I have been able to go portable the rig calibration was verified by two beacons.

Back home in the valley I am stuck as we have no beacons in Wales so I am reliant on the Baofeng for reassurance that things still work & are on frequency. During heavy rain I can usually hear GB3KBQ & sometimes GB3SCX, unfortunately we have had no useful rain for many weeks nor have I caught a whisper of the two beacons by AS.

Somehow I messed up the settings on the Baofeng so in desperation I did a reset. But immediately after doing that I find the 432.0125 RX output has moved down to 10368.145. I have reset this several times but get the same result.

So my question is, what frequency output on 10GHz do others get when using the Baofeng in this way? Is it giving the "correct" frequency in it's present state or was my earlier set up correct & I have reset it up wrongly?
--
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Re: Baofeng UV-5R output on 10GHz

John Fell
 

Hi Clive ,
Never tried that on a BF but seems a reasonable thing to do/P - would imagine some detectable microphony at 10GHz from the synth ref Xtal and temp drift ?

If you cannot hear KBQ or SCX and bands are extremely flat , like now , you could perhaps Tee of your RX down the chain after downconversion and use a scanner to listen to QO100 .Always activity or the two beacons to hear and loud on a 60cm offset .

HNY
John
G0API

PS Any update on the 10GHz  GW beacon ?

On Sat, 16 Jan 2021 at 12:18, Clive Elliott GW4MBS via groups.io <humber1ton=btinternet.com@groups.io> wrote:
I know some of us use the Baofeng UV-5R 2m/70cm hand-held as a signal marker on 10GHz due to the 24th harmonic of the RX LO highlighted in this article:

https://destevez.net/2016/07/phase-noise-of-a-baofeng-uv-5r-10ghz-signal/

When tuned to 432.0125 it gave me a remarkably stable signal on 10368.22 with a GPS locked Kuhne. When I have been able to go portable the rig calibration was verified by two beacons.

Back home in the valley I am stuck as we have no beacons in Wales so I am reliant on the Baofeng for reassurance that things still work & are on frequency. During heavy rain I can usually hear GB3KBQ & sometimes GB3SCX, unfortunately we have had no useful rain for many weeks nor have I caught a whisper of the two beacons by AS.

Somehow I messed up the settings on the Baofeng so in desperation I did a reset. But immediately after doing that I find the 432.0125 RX output has moved down to 10368.145. I have reset this several times but get the same result.

So my question is, what frequency output on 10GHz do others get when using the Baofeng in this way? Is it giving the "correct" frequency in it's present state or was my earlier set up correct & I have reset it up wrongly?
--
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Baofeng UV-5R output on 10GHz

Clive Elliott GW4MBS
 

I know some of us use the Baofeng UV-5R 2m/70cm hand-held as a signal marker on 10GHz due to the 24th harmonic of the RX LO highlighted in this article:

https://destevez.net/2016/07/phase-noise-of-a-baofeng-uv-5r-10ghz-signal/

When tuned to 432.0125 it gave me a remarkably stable signal on 10368.22 with a GPS locked Kuhne. When I have been able to go portable the rig calibration was verified by two beacons.

Back home in the valley I am stuck as we have no beacons in Wales so I am reliant on the Baofeng for reassurance that things still work & are on frequency. During heavy rain I can usually hear GB3KBQ & sometimes GB3SCX, unfortunately we have had no useful rain for many weeks nor have I caught a whisper of the two beacons by AS.

Somehow I messed up the settings on the Baofeng so in desperation I did a reset. But immediately after doing that I find the 432.0125 RX output has moved down to 10368.145. I have reset this several times but get the same result.

So my question is, what frequency output on 10GHz do others get when using the Baofeng in this way? Is it giving the "correct" frequency in it's present state or was my earlier set up correct & I have reset it up wrongly?
--
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Re: Help with Tektronixs 492 S.A. PSU fault.

Nick Gregory G0HIK
 

I didn't know there was group. I'll join that when it fails next time. The heart always misses a beat when you switch on 1980's test kit.

Nick G0HIK


Re: Help with Tektronixs 492 S.A. PSU fault.

Nick Gregory G0HIK
 

Thanks all for the helpful comments.

I've just got it licked, well it looks like it anyway.
It was an overload on the +/- 15v rails. I thought I had disconnected every consumer of the  +/-15v from the motherboard, but hidden under the YIG filter was a supply to the 100MHz L.O. Low and behold there were two +/- 12v regulators, decoupled by Tants. One was S/C but both changed out of course.

Several lessons learnt, every day is a school day, I just need to try and retain it all.

Nick G0HIK


Re: Help with Tektronixs 492 S.A. PSU fault.

geoff wiggins
 

I had a similar type of fault on my Tek 466 storage scope. The supply rail was down to 4.7v approx and that was the clue.

I found a huge current drain and the fault was a short cct 2.2uF capacitor fed from a 4.7v zener which was supposed to feed 10v or so to the trigger pots. Believe it or not this little 400mW zener was taking all that current and didn't blow. The capacitor in question was a small yellow type about the size of the zener. Just follow the track around looking for a short to deck.

Good hunting.

73 Geoff. G4XMJ

On 15/01/2021 18:55, Nick Gregory G0HIK via groups.io wrote:
I came to switching on one time and it light up, but nothing on the display.

The +15 v rail is 4.7v
The -15 v rail is -3.1v.

I think the minus rail uses the plus rail as a reference so it may well be just the + 15v rail faulty.

I've disconnected all cards and connectors and the volts are still low, so I dont think is a card fault and it's probably a PSU fault. The 0.3 ohm resistor in the +15v line says its has a draw of 1.0 amps with seems a lot at 4 volts though.

the +/- 17v rails that feed the +/- 15v are fine.

I would have suspected s/c Tants, but there does not seem to be any tants.

Any help welcomed please.

I've included a part of the circuit with some voltages on.

Thanks Nick G0HIK


Re: Help with Tektronixs 492 S.A. PSU fault.

Mark - M1MPW
 

Is that not a tant by the multiturn preset?
Also... a burnt resistor above the edge connector?

Mark


Re: Request for a broken doner attenuator HP8563 33321

Robin Szemeti - G1YFG
 

You can also ask in this group:


Very helpful people.


On Fri, 15 Jan 2021 at 21:50, Maarten PA0MHE <maarten.heuvelman@...> wrote:
By a stupidity I blew up the control board in the 33321 attenuator in my HP8593 SA, so the attenuation itself is ok but the control logic inside the attenuator is broken.
Normally the RF part of such an attenuator is damaged of such an attenuator by applying too much RF at the input of a SA.
I hope someone has a broken attenuator (RF part) in his junkbox with a still intact control PCB which can be a donor for my attenuator ??????


--
Robin Szemeti - G1YFG


Request for a broken doner attenuator HP8563 33321

Maarten PA0MHE
 

By a stupidity I blew up the control board in the 33321 attenuator in my HP8593 SA, so the attenuation itself is ok but the control logic inside the attenuator is broken.
Normally the RF part of such an attenuator is damaged of such an attenuator by applying too much RF at the input of a SA.
I hope someone has a broken attenuator (RF part) in his junkbox with a still intact control PCB which can be a donor for my attenuator ??????


Re: Help with Tektronixs 492 S.A. PSU fault.

geoffrey pike
 

Hi Nick.
Have you posted this on the Textronics group.io?
Good luck
Geoff
GI0GDP

On Friday, 15 January 2021, 18:55:32 GMT, Nick Gregory G0HIK via groups.io <nickg0hik@...> wrote:


I came to switching on one time and it light up, but nothing on the display.

The +15 v rail is 4.7v
The -15 v rail is -3.1v.

I think the minus rail uses the plus rail as a reference so it may well be just the + 15v rail faulty.

I've disconnected all cards and connectors and the volts are still low, so I dont think is a card fault and it's probably a PSU fault. The 0.3 ohm resistor in the +15v line says its has a draw of 1.0 amps with seems a lot at 4 volts though.

the +/- 17v rails that feed the +/- 15v are fine.

I would have suspected s/c Tants, but there does not seem to be any tants.

Any help welcomed please.

I've included a part of the circuit with some voltages on.

Thanks Nick G0HIK


Re: Help with Tektronixs 492 S.A. PSU fault.

Ian White
 

Nick,

Would an 2x18-way double sided board extender be any use, 0.15in pitch and about 5in long? Could post it on Monday.

A batch was made some years ago for working on FT221 RF boards, so if you really need two there may still be others around to borrow.

73 from Ian GM3SEK


On 15/01/2021 20:49, Nick Gregory G0HIK via groups.io wrote:

Thanks, But unfortunately not this time.

It's a right pain soldering wires to various test points to bring them to the outside would.

I think you can still get 0.15" ( I think) PCB sockets, can you obtain the mating double sided PCB to make a couple of extenders ?


Re: Help with Tektronixs 492 S.A. PSU fault.

Nick Gregory G0HIK
 

Thanks, But unfortunately not this time.

It's a right pain soldering wires to various test points to bring them to the outside would.

I think you can still get 0.15" ( I think) PCB sockets, can you obtain the mating double sided PCB to make a couple of extenders ?


Re: Help with Tektronixs 492 S.A. PSU fault.

cricri
 

Hi ,

Open the PSU and test the fuses  !  ( 2 or 3 don't remember )

Seen a similar pb and it was a fuse broken ..


73

F1VL


Le 15/01/2021 à 19:55, Nick Gregory G0HIK via groups.io a écrit :
I came to switching on one time and it light up, but nothing on the display.

The +15 v rail is 4.7v
The -15 v rail is -3.1v.

I think the minus rail uses the plus rail as a reference so it may well be just the + 15v rail faulty.

I've disconnected all cards and connectors and the volts are still low, so I dont think is a card fault and it's probably a PSU fault. The 0.3 ohm resistor in the +15v line says its has a draw of 1.0 amps with seems a lot at 4 volts though.

the +/- 17v rails that feed the +/- 15v are fine.

I would have suspected s/c Tants, but there does not seem to be any tants.

Any help welcomed please.

I've included a part of the circuit with some voltages on.

Thanks Nick G0HIK



Help with Tektronixs 492 S.A. PSU fault.

Nick Gregory G0HIK
 

I came to switching on one time and it light up, but nothing on the display.

The +15 v rail is 4.7v
The -15 v rail is -3.1v.

I think the minus rail uses the plus rail as a reference so it may well be just the + 15v rail faulty.

I've disconnected all cards and connectors and the volts are still low, so I dont think is a card fault and it's probably a PSU fault. The 0.3 ohm resistor in the +15v line says its has a draw of 1.0 amps with seems a lot at 4 volts though.

the +/- 17v rails that feed the +/- 15v are fine.

I would have suspected s/c Tants, but there does not seem to be any tants.

Any help welcomed please.

I've included a part of the circuit with some voltages on.

Thanks Nick G0HIK


adf3451 software

Neil, G3RIR
 

I have just obtained a ADF3451 via Amazon. It seems to work OK but is there any windows software to control it?

Neil G3RIR


Re: DUBUS Magazine for 2021

Conrad, PA5Y
 

Alan, I think that I will do exactly that. My distance vision remains excellent and a 4-x magnification illuminated lamp or even some 4 x magnification glasses are fine for soldering and I have a microscope for the small stuff.  I don't get headaches when doing this, only when reading. 

I do like the idea of Dubus in its present form and its strange smelling ink, but I need to do something that's for sure.

 I use Sony Xperia tablet for reading pdfs and I have not dropped it yet 🙂

73

Conrad PA5Y



From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Alan Melia via groups.io <Alan.Melia@...>
Sent: 15 January 2021 14:29
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021
 
Conrad If you have reached that state, can I seriously suggest (if you have not done it) it is the time to dump cheap reading glasses and get a full eyetest and prescription glasses. I reached that state about 10 years ago finding I was getting acute eyestrain using standard readng glasses. I found I had astigmatismin my left eye. After getting prescription corrected glasses  I found I could read much more easily though a good light was an advantage, but I no longer felt eyestrain or headaches. I do not need distance glasses yet.
 
Like many of the other I cannot read technical text easily from a screen. A paper copy also makes less noise when it hits the floor than the laptop, when I fall asleep :-))
 
Alan
G3NYK 
----- Original Message -----
Sent: Friday, January 15, 2021 12:38 PM
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021

I used to feel the same way, but the fact is that I no longer get any enjoyment from Dubus. The print is simply too small for me to read. So, what should I do? Ask for a pdf so that I can enlarge the text to a comfortable size or just not renew? Dubus has an aging readership and I am quite sure that I am not the only one struggling. I could buy a big magnifying table lamp I suppose. I can't get on with higher magnification reading glasses, they give me headache.

Just a by-product of getting older.

73

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Robin Szemeti - G1YFG via groups.io <robin@...>
Sent: 15 January 2021 13:22
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021
 
I enjoy getting the paper copy ... there is something "different" about having it in tangible form.  PDF is nice but people will tend to share them, which kills the revenue and eventually, kills the magazine ...

On Fri, 15 Jan 2021 at 12:17, Conrad, PA5Y <g0ruz@...> wrote:
I will renew my subscription, but I feel that it is about time that a PDF version was made available. I find it increasingly difficult to read as my eyesight worsens. Does anyone else feel the same way?

Regards

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Andy G4JNT via groups.io <andy.g4jnt=gmail.com@groups.io>
Sent: 15 January 2021 11:24
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021
 
An excellent magazine - well-worth subscribing to.
And you can use it to practice your German too - all articles appear in both languages.



Virus-free. www.avg.com

On Fri, 15 Jan 2021 at 10:21, Roger Blackwell GM4PMK <gm4pmk@...> wrote:

The usual reminder that, if you wish to received DUBUS Magazine in 2021, subscriptions are due.

UK readers can find all the necessary details at www.dubus.org/uksubs.htm.

Non UK readers should look at www.dubus.org/subs.htm

Any questions, please contact me off list at dubus@...

73

-- 

Roger Blackwell  GM4PMK

www.marsport.org.uk


--
Robin Szemeti - G1YFG


Re: DUBUS Magazine for 2021

Alan Melia
 

Conrad If you have reached that state, can I seriously suggest (if you have not done it) it is the time to dump cheap reading glasses and get a full eyetest and prescription glasses. I reached that state about 10 years ago finding I was getting acute eyestrain using standard readng glasses. I found I had astigmatismin my left eye. After getting prescription corrected glasses  I found I could read much more easily though a good light was an advantage, but I no longer felt eyestrain or headaches. I do not need distance glasses yet.
 
Like many of the other I cannot read technical text easily from a screen. A paper copy also makes less noise when it hits the floor than the laptop, when I fall asleep :-))
 
Alan
G3NYK 

----- Original Message -----
Sent: Friday, January 15, 2021 12:38 PM
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021

I used to feel the same way, but the fact is that I no longer get any enjoyment from Dubus. The print is simply too small for me to read. So, what should I do? Ask for a pdf so that I can enlarge the text to a comfortable size or just not renew? Dubus has an aging readership and I am quite sure that I am not the only one struggling. I could buy a big magnifying table lamp I suppose. I can't get on with higher magnification reading glasses, they give me headache.

Just a by-product of getting older.

73

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Robin Szemeti - G1YFG via groups.io <robin@...>
Sent: 15 January 2021 13:22
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021
 
I enjoy getting the paper copy ... there is something "different" about having it in tangible form.  PDF is nice but people will tend to share them, which kills the revenue and eventually, kills the magazine ...

On Fri, 15 Jan 2021 at 12:17, Conrad, PA5Y <g0ruz@...> wrote:
I will renew my subscription, but I feel that it is about time that a PDF version was made available. I find it increasingly difficult to read as my eyesight worsens. Does anyone else feel the same way?

Regards

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Andy G4JNT via groups.io <andy.g4jnt=gmail.com@groups.io>
Sent: 15 January 2021 11:24
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021
 
An excellent magazine - well-worth subscribing to.
And you can use it to practice your German too - all articles appear in both languages.



Virus-free. www.avg.com

On Fri, 15 Jan 2021 at 10:21, Roger Blackwell GM4PMK <gm4pmk@...> wrote:

The usual reminder that, if you wish to received DUBUS Magazine in 2021, subscriptions are due.

UK readers can find all the necessary details at www.dubus.org/uksubs.htm.

Non UK readers should look at www.dubus.org/subs.htm

Any questions, please contact me off list at dubus@...

73

-- 

Roger Blackwell  GM4PMK

www.marsport.org.uk


--
Robin Szemeti - G1YFG


Re: DUBUS Magazine for 2021

Andy
 

Renewed my subscription before Christmas!

I enjoy getting a magazine although 31 years of them is starting to take up a noticeable amount of space on the bookshelves.

I used to get QST in paper then switched to online only simply for the cost and space saving. The format was such you could, with a bit of program-foo convert it to PDF (albeit 300MB per magazine) for my own use. I was happy with that as I could read my QSTs on any computer/tablet I had.  Then ARRL changed the format to something horrific with animated page turning and rustling noises that was not portable and needed an online connection to display.  That's when I cancelled QST. I don't mind a company protecting its assets but if I cannot access what I have paid for in way that suits my needs then they don't get my money.  And yes, I'm sure I wasn't the only person who figured out how to get the old QST digital format converted to PDF and some people will have been making copies available so I don't blame ARRL for changing to a more protected form. Just the version they choose was so horrible. Perhaps I should have bought an iPad and it would have been lovely and it was just the Windows version that sucked. The ARRL viewer app would not run on my old Android tablet.

Andy
MM0FMF


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Conrad, PA5Y <g0ruz@...>
Sent: Friday, January 15, 2021 4:16 AM
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021
 
I will renew my subscription, but I feel that it is about time that a PDF version was made available. I find it increasingly difficult to read as my eyesight worsens. Does anyone else feel the same way?

Regards

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Andy G4JNT via groups.io <andy.g4jnt@...>
Sent: 15 January 2021 11:24
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] DUBUS Magazine for 2021
 
An excellent magazine - well-worth subscribing to.
And you can use it to practice your German too - all articles appear in both languages.



Virus-free. www.avg.com

On Fri, 15 Jan 2021 at 10:21, Roger Blackwell GM4PMK <gm4pmk@...> wrote:

The usual reminder that, if you wish to received DUBUS Magazine in 2021, subscriptions are due.

UK readers can find all the necessary details at www.dubus.org/uksubs.htm.

Non UK readers should look at www.dubus.org/subs.htm

Any questions, please contact me off list at dubus@...

73

-- 

Roger Blackwell  GM4PMK

www.marsport.org.uk

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