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Antique FT290/790 mic.
Chris Bartram G4DGU
If anyone here uses a FT790/290 transceiver as a tunable IF and is interested, while tidying my workroom I have discovered am orphaned spare microphone, probably dating from 1985, cowering in a cupboard. The first person to contact me with their address will receive it in the post in the next few days. Otherwise the 'electricals' skip at the local recycling centre beckons.
73 Chris G4DGU
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Re: smb plug?
militaryoperator
Managed to mod the little tube adaptor, had to file the centre pin on the sma socket though just a little, then soldered the legs to the body.
Run out of pcb mounting sockets but will mod the i/p when new ones arrive.
Thanks Martin.
Ben.
Military Wireless Museum
Kidderminster, UK.
Still trying to get a 2.4GHz signal for testing the amp so might have to get out the Lime! Martin G8LCE _._,_._,_
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Re: smb plug?
groupio@...
There seems to be a problem with the design of my edition of the Pluto! and it can give problems with the USB and earths.
https://wiki.analog.com/university/tools/pluto/hacking/hardware Still trying to get a 2.4GHz signal for testing the amp so might have to get out the Lime! Martin G8LCE
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Re: smb plug?
militaryoperator
It never ceases to amaze me at the ingenuity of radio hams, hi.
Great Martin, that solves one of my problems, must press on and get it going, hi.
-----Original Message-----
From: groupio <groupio@...> To: UKMicrowaves <UKMicrowaves@groups.io> Sent: Fri, 17 Jan 2020 23:16 Subject: Re: [UKMicrowaves] smb plug? I did not take the original socket off the board. The input one can have the SMA 'plugged' into it and just the four corner legs soldered. The output came with the 'barrel' connector and here again I just 'plugged' the SMA into one end and soldered.
Today I used the jumper leads to plug the power into the power sockets and powered the amp up (with dummy load) It takes around 2 Amps but I could not get a signal into it as when I connected the Pluto to it the Pluto disconnected from the computer!!! I measured a small voltage between the outer SMA on the pluto and the negative lead (which is earthed at the PSU) with the Pluto connected to my computer. There must be some sort of earthing problem in my system! Tomorrow I will try again and could use a laptop to drive the Pluto to avoid the earth problem. I may have a clue here to other problems I have had with connecting to the Pluto...... See how the back of the SMA is like a plug and the four legs are used to solder it down. Martin G8LCE
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Re: smb plug?
Alan Melia
toggle quoted messageShow quoted text
Martin check you have actually got a three wire
earthed lead suppled with the desktop. I have found leads with IEC con and metal
Earth pins but onlt L and N connected through. If this is the case your laptop
may even be worse and they usually float. If I am plugging things into a PC I
like to have everything firmly grounded on the chassis. There can be 350Vac as
measuredon a high impedance DMM. This is sometimes enough to take out in
interface device.
Alan
G3NYK
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Re: smb plug?
groupio@...
I did not take the original socket off the board. The input one can have the SMA 'plugged' into it and just the four corner legs soldered. The output came with the 'barrel' connector and here again I just 'plugged' the SMA into one end and soldered.
Today I used the jumper leads to plug the power into the power sockets and powered the amp up (with dummy load) It takes around 2 Amps but I could not get a signal into it as when I connected the Pluto to it the Pluto disconnected from the computer!!! I measured a small voltage between the outer SMA on the pluto and the negative lead (which is earthed at the PSU) with the Pluto connected to my computer. There must be some sort of earthing problem in my system! Tomorrow I will try again and could use a laptop to drive the Pluto to avoid the earth problem. I may have a clue here to other problems I have had with connecting to the Pluto...... See how the back of the SMA is like a plug and the four legs are used to solder it down. Martin G8LCE
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Re: smb plug?
militaryoperator
As for the multi way power connectors I am very tempted to cut the pins near the top of the underneath bits
-----------------------------------
Martin,
I bought this off ebay, 142781889334, which fits once you cut a 5 pin set.
Ben
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Re: smb plug?
militaryoperator
Martin,
I have this amp and need to alter the in/out. How did you get the input and output sockets off the board?
I can see the socket edge soldering but cannot get to the centre pin. How did you do it?
Ben.
Subject: Re: [UKMicrowaves] smb plug?
Here is my final conversion of the sockets/plugs. I used ordinary SMA printed circuit mounting sockets.
As for the multi way power connectors I am very tempted to cut the pins near the top of the underneath bits and turning over the bit cut off pluging it into the pins now left. Then soldering on the power supply wires to the reverse side (now the top) of the connectors. This would mean you could unplug the power leads. Take a look at the connectors and see if you think that might work. The other plan is to use some wires with pins on that come with prototyping pin boards that are sold for RPi experimenting etc. and then glueing the finish set of pins to form a plug. Martin - G8LCE
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Re: smb plug?
groupio@...
Thanks for the offer of the Tonna. I think it is a problem with the design which I can probably sort out with some silicon sealer when the dry weather comes!
The cost of a circulator is much more that the cost of the MOSFET in the linear and I bought two. The replacing of the device is reallly easy once you have done it. I just desoldered the two halves of the printed circuit board (input side and output side) and removed them. Then I undid the copper base containing the FET. I heated it up on an old ring cooker and used an optical (infrared) themometer to watch the temperature get to 140C. Popped the old one off and new one on. Rebuilt the Amp and back on air. It is easy although before attempting it I was worried but now I would encourage others to have a go. I transmit 23cms through a Wimo aerial now and receive via the Tonna. I use a Bird throughline before using a new setup! Latest project is working with iBase i38 computers. They are around £30 on Ebay and work off 12v. They can run Windows 10 Pro and have USB 3. I use them for remote stuff as they can be started from cold by switching on the power. (close them down properly though) They are good at running Plutos and Limes but I also use them for Navigating (on a boat) and Telescope control. If anyone needs info on converting these g8lce@... Martin G8LCE
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Re: smb plug?
Martin
If you're struggling with your Tonna antenna, I have an ATV 23 ele Tonna stored and it is in excellent condition ~ probably just suffering from a coating of dust! To help reduce the problems of blowing your PA again, you might consider using a circulator from Bert PE1RKI - http://www.pe1rki.com/circulators.html 73 Bob
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Re: smb plug?
groupio@...
Hi Dave,
I know the feeling. I have just modified a Nokia PA for 437MHz DATV. Basically it was a matter of supplying 28v to the right pins and 12v to switch it on. A couple of 'links' to enable things and away it went. I think this will be similar but have not done it yet. The mods for the SMA connections suddenly came in a lightbulb moment, i am still waiting for the next one. I will take some more photos when I modify it. 437MHz conversion: http://g8lce.com/forum/viewtopic.php?f=11&t=18 Martin - G8LCE
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Re: smb plug?
Timestep
Hi Martin
Were you able to find modification details on that
PA ? I've seen several iffy one ?
Thanks
Dave
G4IUG
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Re: smb plug?
groupio@...
Here is my final conversion of the sockets/plugs. I used ordinary SMA printed circuit mounting sockets.
As for the multi way power connectors I am very tempted to cut the pins near the top of the underneath bits and turning over the bit cut off pluging it into the pins now left. Then soldering on the power supply wires to the reverse side (now the top) of the connectors. This would mean you could unplug the power leads. Take a look at the connectors and see if you think that might work. The other plan is to use some wires with pins on that come with prototyping pin boards that are sold for RPi experimenting etc. and then glueing the finish set of pins to form a plug. Martin - G8LCE
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Re: Dishes and wind
Pete - GM4BYF
If the wind blows the wrong way, this is what happens !! Fortunately no damage to anybody or anything - except my pride! See attached 73 Pete GM4BYF On 16/01/20 10:00, Alan Beard wrote:
Taken on Ponape, Federated States of Melanesia --
vry 73 Pete GM4BYF
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Re: Ungar
Bob Lockley VK6KW
toggle quoted messageShow quoted text
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Gordon REASON via Groups.Io
Sent: Thursday, January 16, 2020 9:19 PM To: banburyars_g0bra@...; UKMicrowaves@groups.io Subject: [UKMicrowaves] Ungar
I have a working Ungar 9900 soldering station , but no iron , no longer made ......... Using various loads instead of a 24 volt iron element , it appears to be good . Does anyone perhaps have any info , on an Ungar 9911 , or similar , soldering iron ....I need to know what type thermocouple it used .
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Ungar
Gordon REASON
I have a working Ungar 9900 soldering station , but no iron , no longer made ......... Using various loads instead of a 24 volt iron element , it appears to be good . Does anyone perhaps have any info , on an Ungar 9911 , or similar , soldering iron ....I need to know what type thermocouple it used .
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Re: 3cm personal beacon frequencies
toggle quoted messageShow quoted text
On Thu, 16 Jan 2020 at 10:17, geoffrey pike via Groups.Io <gi0gdp=yahoo.co.uk@groups.io> wrote:
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3cm personal beacon frequencies
geoffrey pike
Just looked at the RadCom RSGB band plan and so are personal beacons in:- 10,400-10,475 MHz or under local beacons:- 10,368.750 to 800 MHz cheers Geoff GI0GDP
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Re: Dishes and wind
Alan Beard
Taken on Ponape, Federated States of
Melanesia
What happens if the wind blows the wrong way???
Taken in 2010
Alan VK2ZIW
On Wed, 15 Jan 2020 10:24:03 +0000, alwyn.seeds1
wrote
> The same Husband & Co. that did the structural design for Jodrell Bank. > > Interesting description of the issues faced in [UTF-8?]Lovell’s book [UTF-8?]“The Story of Jodrell [UTF-8?]Bank�. > > 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. > _____________________________________________________ --------------------------------------------------- Alan Beard OpenWebMail 2.53
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WTB: HP 5086-7781 YIG module
Conrad, PA5Y
I don´t suppose any one has for sale or can repair a HP 5086-7781 YIG for my HP-8562A? I have left it to one side for long enough, its time that I fixed it.
73
Conrad PA5Y
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