Date   

Re: Dual gate mosfets ...

Robin Szemeti - G1YFG
 

That would be most kind Colin ... I had been wondering why my transverter seemed somewhat deaf for a while now!

On Mon, 23 Nov 2020 at 16:38, Colin Ranson <g8lbs@...> wrote:

Robin,

 

I have a 3SK174 you can have – still on its NEC paper strip – been looking for a good ohm for thrice-ten years or so.

 

Regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Robin Szemeti - G1YFG
Sent: 23 November 2020 14:38
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Dual gate mosfets ...

 

As the 3SK97 / NE41137 in my 23cm transverter appears to have shat itself ... (presumably as a result of me transmitting into it at some point)  .. is there a current preferred replacement? 

 

All I can find in dual gate is the BF998 which is SMD ... I can probably make it fit, if I have to ... any other recommendations that are easy to get?

 


--
Robin Szemeti - G1YFG

 


--
Robin Szemeti - G1YFG


Re: Low Cost VNA

Stanislaw Ziemczonek
 

I would like to warn colleagues who have decided to purchase the version with N sockets (NanoVNA V2_2 - trade name SAA-2N) not to tighten the nuts on the N sockets on the faceplate of this device.
Today I 'discovered' that the N sockets are in fact N-SMA adapters that are screwed onto the SMA sockets coming out of the VNA board and soldered to them (yes, the SMA plug nut is soldered to the socket mounted on the PCB).
N-socket nut tightened too much may tear this connector off the PCB.

At the moment, I have used the lock nuts that are under the 'faceplate' of the device and after mounting the faceplate they are tightened with the N socket nut, but without the washer.
This solution stiffens the N sockets together, although it does not fully protect the VNA PCB from tearing off the SMA sockets when measuring thick and stiff cables.
The three control buttons are less protruding but can be controlled.

73's de Staszek SP6GWB

Members of the group might be interested in this low cost VNA that covers 50kHz-3GHz:

https://www.aliexpress.com/item/1005001267696890.html

Sam G4DDK has measured his compared to an HP VNA and cal kit, and thinks its good value.

It will actually go up to about 4GHz but with unknown accuracy.

Its in a rugged metal case and with N connectors so good for external work on antennas.

Several of my locals now have this. Delivery about 3-4 weeks from order, and it appears to creep into the UK without any VAT to pay (so far).

73

John G3XDY




Re: Dual gate mosfets ...

Colin Ranson
 

Robin,

 

I have a 3SK174 you can have – still on its NEC paper strip – been looking for a good ohm for thrice-ten years or so.

 

Regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Robin Szemeti - G1YFG
Sent: 23 November 2020 14:38
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Dual gate mosfets ...

 

As the 3SK97 / NE41137 in my 23cm transverter appears to have shat itself ... (presumably as a result of me transmitting into it at some point)  .. is there a current preferred replacement? 

 

All I can find in dual gate is the BF998 which is SMD ... I can probably make it fit, if I have to ... any other recommendations that are easy to get?

 


--
Robin Szemeti - G1YFG

 


Re: Chinese ADF4351 signal source

Clint Sharp <cjaysharp@...>
 

Depends on ref frequency but yes, you're correct, it's not always 'very' small, I should have said 'smaller' however, they're still limited by the on-board controller firmware on some of the boards which have OLED/TFT display and a UI, I'm not sure if you can bypass that with the serial/USB ports though?


On Mon, 23 Nov 2020 at 15:57, Andy G4JNT <andy.g4jnt@...> wrote:
Well, not very small.  Teh ADF4351 has a maximum Denominator register of just 4096, so your minimum step is going to be afew kHz  or so at 10MHz type reference frequencies and OPdiv = 1

If you want REALLY fine step size, use the ADF5355 with a double Fract-N set for mHz resolution   at GHz frequencies
See http://g4jnt.com/ADF5355_Synthesizer_Control.pdf for programming info for that device



On Mon, 23 Nov 2020 at 15:39, Clint Sharp <cjaysharp@...> wrote:
Think that's the thing, the ADF4351 chip itself is programmable in very small steps but on the boards with control interface sometimes have a minimum step size enforced in the firmware amd the only way to solve that is to reprogram the MCU

On Mon, 23 Nov 2020, 14:43 Robin Szemeti - G1YFG, <robin@...> wrote:
The chinese modules have the ADF4351 so will have the same steps as any other ADF4351 system ... how you program it is what matters, there are low spur modes, many parameters can affect output quality .. but, in terms of step size, they will behave just like any other ADF4351. I tend to stick to "integer N" modes as the spurs appear to be lower than running in fractional N ... so I pick my references to be an integer division of the output frequency.


On Mon, 23 Nov 2020 at 14:37, Richard Ferryman via groups.io <g4bbh=btinternet.com@groups.io> wrote:
I think it will be useful. Most of my external references are 10MHz which are GPS locked and based on 10MHz double oven.  I now hace a Leo Bodnar GPSDO so I should be able to set up the second output for whatever reference I need whils the output 1 runs 10MHz for my IC-9700.
I have a gut feeling that the Chinese module will have very big frequency steps.
Dick


--
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: Chinese ADF4351 signal source

Andy G4JNT
 

Well, not very small.  Teh ADF4351 has a maximum Denominator register of just 4096, so your minimum step is going to be afew kHz  or so at 10MHz type reference frequencies and OPdiv = 1

If you want REALLY fine step size, use the ADF5355 with a double Fract-N set for mHz resolution   at GHz frequencies
See http://g4jnt.com/ADF5355_Synthesizer_Control.pdf for programming info for that device



On Mon, 23 Nov 2020 at 15:39, Clint Sharp <cjaysharp@...> wrote:
Think that's the thing, the ADF4351 chip itself is programmable in very small steps but on the boards with control interface sometimes have a minimum step size enforced in the firmware amd the only way to solve that is to reprogram the MCU

On Mon, 23 Nov 2020, 14:43 Robin Szemeti - G1YFG, <robin@...> wrote:
The chinese modules have the ADF4351 so will have the same steps as any other ADF4351 system ... how you program it is what matters, there are low spur modes, many parameters can affect output quality .. but, in terms of step size, they will behave just like any other ADF4351. I tend to stick to "integer N" modes as the spurs appear to be lower than running in fractional N ... so I pick my references to be an integer division of the output frequency.


On Mon, 23 Nov 2020 at 14:37, Richard Ferryman via groups.io <g4bbh=btinternet.com@groups.io> wrote:
I think it will be useful. Most of my external references are 10MHz which are GPS locked and based on 10MHz double oven.  I now hace a Leo Bodnar GPSDO so I should be able to set up the second output for whatever reference I need whils the output 1 runs 10MHz for my IC-9700.
I have a gut feeling that the Chinese module will have very big frequency steps.
Dick


--
Robin Szemeti - G1YFG


Re: Chinese ADF4351 signal source

Clint Sharp <cjaysharp@...>
 

Think that's the thing, the ADF4351 chip itself is programmable in very small steps but on the boards with control interface sometimes have a minimum step size enforced in the firmware amd the only way to solve that is to reprogram the MCU


On Mon, 23 Nov 2020, 14:43 Robin Szemeti - G1YFG, <robin@...> wrote:
The chinese modules have the ADF4351 so will have the same steps as any other ADF4351 system ... how you program it is what matters, there are low spur modes, many parameters can affect output quality .. but, in terms of step size, they will behave just like any other ADF4351. I tend to stick to "integer N" modes as the spurs appear to be lower than running in fractional N ... so I pick my references to be an integer division of the output frequency.


On Mon, 23 Nov 2020 at 14:37, Richard Ferryman via groups.io <g4bbh=btinternet.com@groups.io> wrote:
I think it will be useful. Most of my external references are 10MHz which are GPS locked and based on 10MHz double oven.  I now hace a Leo Bodnar GPSDO so I should be able to set up the second output for whatever reference I need whils the output 1 runs 10MHz for my IC-9700.
I have a gut feeling that the Chinese module will have very big frequency steps.
Dick


--
Robin Szemeti - G1YFG


Re: Dual gate mosfets ...

Andy G4JNT
 

Make the effort to make it fit !
IIRC the pinout of SMT DG MOSFETs allow them to sit on the pads of the old wired type.   That's purely based on memory of a very loooong time ago, so may be wrong.
Check it out and report back.



On Mon, 23 Nov 2020 at 14:38, Robin Szemeti - G1YFG <robin@...> wrote:
As the 3SK97 / NE41137 in my 23cm transverter appears to have shat itself ... (presumably as a result of me transmitting into it at some point)  .. is there a current preferred replacement? 

All I can find in dual gate is the BF998 which is SMD ... I can probably make it fit, if I have to ... any other recommendations that are easy to get?



--
Robin Szemeti - G1YFG


Re: Chinese ADF4351 signal source

Robin Szemeti - G1YFG
 

The chinese modules have the ADF4351 so will have the same steps as any other ADF4351 system ... how you program it is what matters, there are low spur modes, many parameters can affect output quality .. but, in terms of step size, they will behave just like any other ADF4351. I tend to stick to "integer N" modes as the spurs appear to be lower than running in fractional N ... so I pick my references to be an integer division of the output frequency.


On Mon, 23 Nov 2020 at 14:37, Richard Ferryman via groups.io <g4bbh=btinternet.com@groups.io> wrote:
I think it will be useful. Most of my external references are 10MHz which are GPS locked and based on 10MHz double oven.  I now hace a Leo Bodnar GPSDO so I should be able to set up the second output for whatever reference I need whils the output 1 runs 10MHz for my IC-9700.
I have a gut feeling that the Chinese module will have very big frequency steps.
Dick


--
Robin Szemeti - G1YFG


Dual gate mosfets ...

Robin Szemeti - G1YFG
 

As the 3SK97 / NE41137 in my 23cm transverter appears to have shat itself ... (presumably as a result of me transmitting into it at some point)  .. is there a current preferred replacement? 

All I can find in dual gate is the BF998 which is SMD ... I can probably make it fit, if I have to ... any other recommendations that are easy to get?



--
Robin Szemeti - G1YFG


Re: Chinese ADF4351 signal source

Richard Ferryman
 

I think it will be useful. Most of my external references are 10MHz which are GPS locked and based on 10MHz double oven.  I now hace a Leo Bodnar GPSDO so I should be able to set up the second output for whatever reference I need whils the output 1 runs 10MHz for my IC-9700.
I have a gut feeling that the Chinese module will have very big frequency steps.
Dick


Re: Chinese ADF4351 signal source

Dave Cutts
 

I use a cheap 4351 board (about £13) from china, locked to GPS to injection lock the 116MHz crystal on a DDK Anglian Transverter. Works great, just programmed for the one frequency.

73 Dave G4FAW


Re: Optimum tone freq for detecting a weak

Gordon REASON <gordonj.reason@...>
 

Surely , unless you have a glitch in your audible E-thearial ( Joke .... get it ? ) response , or suffer annoying tinnitis , it's the shape of the tone response thay matters .........

A pure sine wave is much easier and gentler , on the earbones , to listen to , than a sharp singing squarewave or similar .  

Not for me !

On 21 November 2020 at 14:17 Neil Smith G4DBN <neil@...> wrote:

There is a whole level of nutjob action on Youtube where they publish copies of music with A set to 432 Hz instead of 440 cos it does Healing and is more in tune with the Universe and stuff.  All about harmonics of Schumann resonances.

Good grief.

Except it isn't.  It's all because Verdi didn't like singers being divas about high notes. Allegedly.

There are even apps that will do the 440->432 conversion.

Gentle pee-extraction of the nuttiness by this guy.... https://www.youtube.com/watch?v=EKTZ151yLnk

Neil G4DBN

On 21/11/2020 13:57, Andy G4JNT wrote:

I posed the same question to an ex-military comms intercept chappess.   Her first comment was that:
 "you're all a bunch of deaf old f__rts who can only ever hear low tones" (they're a rude lot, ex military types) then commented that there were considered to be two 'magic frequencies', but wouldn't say initially what they were.   Today she came back with:
" 432Hz is favoured by many in the healing game,  occasionally there are them that think 528Hz works better".   

Which has got nothing to do with comms intercept work, and seems more about meditation and cult stuff, but I tried listening to those tone frequencies, including buried in noise.  And she's right.  They do sound 'nice'  and quite detectable.  They also happen to be in the ratio 11/9.  So just for the fun of it, there are now eight user-selectable tones in my gizmo, in the ratio 1.2222222   starting 432, 528, 645 etc up to 1760Hz.   Details will be published in due course (writing it up now, hopefully in time for Scatterpoint)




 


 


Re: KST ghost hoards?

Tony G4NBS
 

Something that I found by accident a few years ago - if you log in with one PC but don't log out properly then a different PC (with the same log in detail) will still not let you log out.
You think that you've done it but your call remains on the list!

Not sure if it happens if both PC's are on the same IP address (ie at home) but happened to me when I was /P and just closed the laptop without logging off. When I went home I was made aware I was still logged in but couldn't correct it till the laptop was used again. Vague feeling I was actually using KST2ME at the time as well just to confuse.....

73
Tony G4NBS


Re: Chinese ADF4351 signal source

Andy G4JNT
 

😅😈😅😈😅😈😅😈😅😈😅👍💀😈



On Mon, 23 Nov 2020 at 11:57, Robin Szemeti - G1YFG <robin@...> wrote:
I'd concur with the crystals being way off ... I used an external cheap chinese "golden" TCXO and I have to say it is solid as a rock in terms of frequency ... during the low band cumulative, the TCXO refused to come at all ... when the contest finished, it sprang into life!   I discovered if turned all the fans off in the shack, and listened very carefully out of the window, I could faintly hear Andy JNT laughing in the distance ...

The actual Chinese 4351 boards seem fine .. you must check the value of the charge pump resistor though and make sure you set it the same in your software programmer.

On Mon, 23 Nov 2020 at 11:45, geoffrey pike via groups.io <gi0gdp=yahoo.co.uk@groups.io> wrote:
That's a good price, apart from spectral purity which varies alot with these boards in general
it may be worth checking the minimum frequency step as some are as high as 100 KHz
and you may need to consider an external ref also as some of the on board xtals are way off
cheers
Geoff
GI0GDP


On Monday, 23 November 2020, 10:35:27 GMT, Richard Ferryman via groups.io <g4bbh=btinternet.com@groups.io> wrote:


I have been looking at a Chinese signal source using an ADF4351 and sold for around £30.  This one has a large LCD display and several functions and looks to have an SMA connector for an external reference but the spec doesn't say much.  I am looking at it a general signal generator for my QO-100 activities.  Does anyone use on of the boards and are they of any use??  Are there any really bad sides?
Dick G4BBH


--
Robin Szemeti - G1YFG


Re: Chinese ADF4351 signal source

Robin Szemeti - G1YFG
 

I'd concur with the crystals being way off ... I used an external cheap chinese "golden" TCXO and I have to say it is solid as a rock in terms of frequency ... during the low band cumulative, the TCXO refused to come at all ... when the contest finished, it sprang into life!   I discovered if turned all the fans off in the shack, and listened very carefully out of the window, I could faintly hear Andy JNT laughing in the distance ...

The actual Chinese 4351 boards seem fine .. you must check the value of the charge pump resistor though and make sure you set it the same in your software programmer.


On Mon, 23 Nov 2020 at 11:45, geoffrey pike via groups.io <gi0gdp=yahoo.co.uk@groups.io> wrote:
That's a good price, apart from spectral purity which varies alot with these boards in general
it may be worth checking the minimum frequency step as some are as high as 100 KHz
and you may need to consider an external ref also as some of the on board xtals are way off
cheers
Geoff
GI0GDP


On Monday, 23 November 2020, 10:35:27 GMT, Richard Ferryman via groups.io <g4bbh=btinternet.com@groups.io> wrote:


I have been looking at a Chinese signal source using an ADF4351 and sold for around £30.  This one has a large LCD display and several functions and looks to have an SMA connector for an external reference but the spec doesn't say much.  I am looking at it a general signal generator for my QO-100 activities.  Does anyone use on of the boards and are they of any use??  Are there any really bad sides?
Dick G4BBH


--
Robin Szemeti - G1YFG


Re: KST ghost hoards?

Robin Szemeti - G1YFG
 

I just like to see what's been going on during the day. i tend to leave it running and if I hear the meep I respond, if I don't well, I don't.

I'm planning to add "stored messages" to my software ... that might be nice.  Having used it a few times in anger I can see some improvements needed too, will try to do those over the next month or so.


On Sun, 22 Nov 2020 at 22:47, Conrad, PA5Y <g0ruz@...> wrote:

Then they are very naughty operators or most likely forgot due to old age. I forget to set no here sometimes.

 

How much time did you actually waste? You seem to be overreacting a little.

 

Regards

 

Conrad PA5Y

 

 

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of militaryoperator via groups.io
Sent: 22 November 2020 19:15
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] KST ghost hoards?

 

The simple answer is that you might be interested to know what has happened while you have been "away". 

I don't see a problem with setting your status as away if you just want to monitor activity, your callsign is in brackets so everyone is aware. 

 

Pete, G4CLA.

 

Not everyone it seems. I wondered what the brackets around a callsign meant. One should learn something every day. 

 

Still, unfortunately, none of those I wasted my time on today had any brackets whatsoever!

 

Cheers, Pete.  Ben.


--
Robin Szemeti - G1YFG


Re: Chinese ADF4351 signal source

geoffrey pike
 

That's a good price, apart from spectral purity which varies alot with these boards in general
it may be worth checking the minimum frequency step as some are as high as 100 KHz
and you may need to consider an external ref also as some of the on board xtals are way off
cheers
Geoff
GI0GDP


On Monday, 23 November 2020, 10:35:27 GMT, Richard Ferryman via groups.io <g4bbh@...> wrote:


I have been looking at a Chinese signal source using an ADF4351 and sold for around £30.  This one has a large LCD display and several functions and looks to have an SMA connector for an external reference but the spec doesn't say much.  I am looking at it a general signal generator for my QO-100 activities.  Does anyone use on of the boards and are they of any use??  Are there any really bad sides?
Dick G4BBH


Re: Programming 13Ghz Signal generator

Andy G4JNT
 

No experience of that hardware, but I note from the manual the command has to be terminated with a [LF] only, 0x0A
To quote:
" The format is: wfcxxxxxxxxxxxx + 0x0a, a total of 16 bytes; "

Many terminal progs send [CR][LF]   0x0D, 0x0A  or just [CR]  0x0D  
Putty can be set up to do whatever is needed

The manual also shows the commands in lower case (and I hate seeing hex characters in lower case).
Have you tried lower / upper case ?    Programmers sometimes get lax about that sort of thing,   er...er.. cough, ahem ...
Or it may be a translation thing

Where


On Mon, 23 Nov 2020 at 10:14, Mike Webb <gd6icr@...> wrote:
According to the spec of this device (ADF5355 54M-13.6GHz) it is programmable via USB - Ive tried a few methods but cant get it to re-act to any serial commands anyone out there with experience of this device A copy of the chinese and translated instruction is enclosed as well


https://www.ebay.co.uk/itm/ADF5355-OLED-Digital-54M-13-6GHz-RF-Source-Generator-Frequency-Source-Moudle-New-/253690376645?hash=item3b111ff1c5
--
Mike GD6ICR IO74PF73TW


Chinese ADF4351 signal source

Richard Ferryman
 

I have been looking at a Chinese signal source using an ADF4351 and sold for around £30.  This one has a large LCD display and several functions and looks to have an SMA connector for an external reference but the spec doesn't say much.  I am looking at it a general signal generator for my QO-100 activities.  Does anyone use on of the boards and are they of any use??  Are there any really bad sides?
Dick G4BBH


Re: KST ghost hoards?

GM6VXB
 

A lot of stations forget that they have KST in a background window, so 'appear' to be logged on even when no where near the PC/radio.
If I am near radios then I am logged on. If doing other things but looking back occassionally then I post ' I am away'. If I have given up for
the day then I log-off.
I could say simple, but probably not to many.
Simple when you use KST a lot, if you do not, why not have a look at the 'HELP' section in MENU.

Some pet hates I often see on KST:
WHAT IS YOUR LOCATOR ?. Have a look at the 'users list', call, locator, name, and possibly equipment appears there.

Not using 'MEEP'. Fine on a slow KST day, but try it during a contest then complain that 'A Station' never answers me.

The sudden influx of stations when there is an activity/contest on. Shame really as they probably have missed some
good conditions during the month they were not active. Who noticed some good 'coastal ducting' earlier this month ?.

Many others but you need to use KST to spot them.

Martin, GM6VXB








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