Radio Station Rebuild

User avatar
PanBiker
Site Administrator
Site Administrator
Posts: 7957
Joined: 23 Jan 2012, 13:07
Location: Barnoldswick - In the West Riding of Yorkshire, always was, always will be.

Re: Radio Station Rebuild

Post by PanBiker » 24 Nov 2014, 17:45

As reported in the other thread, I have now deployed the linear PSU after one or two modifications. Ideally I need to get some heavy duty spade terminals for the power lead for my HF transceiver, they are currently bare ends which will be better terminated in spades. The PSU is working OK though, fan ticks over all the time and is silent running and the unit is considerably less noisy on the bands from an RFI point of view.
Ian

User avatar
Stanley
Global Moderator
Global Moderator
Posts: 46766
Joined: 23 Jan 2012, 12:01
Location: Barnoldswick. Nearer to Heaven than Gloria.

Re: Radio Station Rebuild

Post by Stanley » 25 Nov 2014, 05:16

Pop round and look in my terminal kit Ian......
Stanley Challenger Graham
Stanley's View
scg1936 at talktalk.net

"Beware of certitude" (Jimmy Reid)
The floggings will continue until morale improves!

User avatar
PanBiker
Site Administrator
Site Administrator
Posts: 7957
Joined: 23 Jan 2012, 13:07
Location: Barnoldswick - In the West Riding of Yorkshire, always was, always will be.

Re: Radio Station Rebuild

Post by PanBiker » 25 Nov 2014, 08:35

Thanks Stanley but I checked last night as a little light bulb came on in my head. Found some in a box of bits I packed up 20 years ago. You never know when they will come in handy. :wink:
Ian

User avatar
Stanley
Global Moderator
Global Moderator
Posts: 46766
Joined: 23 Jan 2012, 12:01
Location: Barnoldswick. Nearer to Heaven than Gloria.

Re: Radio Station Rebuild

Post by Stanley » 26 Nov 2014, 06:01

That's why my treasure chests are so full!
Stanley Challenger Graham
Stanley's View
scg1936 at talktalk.net

"Beware of certitude" (Jimmy Reid)
The floggings will continue until morale improves!

User avatar
PanBiker
Site Administrator
Site Administrator
Posts: 7957
Joined: 23 Jan 2012, 13:07
Location: Barnoldswick - In the West Riding of Yorkshire, always was, always will be.

Re: Radio Station Rebuild

Post by PanBiker » 10 May 2017, 16:35

My main station transceiver (Yaesu FT-897) has developed a fault, it has gone "deaf" (insensitive on receive) on the VHF bands. After a bit of investigation the fault turns out to be the ceramic IF filters on the main board in the transceiver. These are small plastic encapsulated filters, the originals fitted by the manufacturer are made by TOKO and have been found to have been encapsulated in a type of plastic that retains moisture. As the equipment cycles through heat and cold during normal operation, residual moisture within the plastic condenses and effectively rots the component from within. The fault manifests as salts which appear on the outside casing of the filters. It's well documented on the internet and YouTube so I have ordered up some replacements of a different make, they are type and pin for pin replacements. I will document the repair over in the homebrew thread as it's under the lid repair stuff.

The filters have arrived but after a thorough search I realised that I no longer have all of my anti static bench mats and ancillary earthing gear. I don't want to cause any static damage when I disassemble the transceiver so I have ordered up a small anti static mat suitable for my bench top, it should arrive tomorrow. I still have my wrist straps and a few leads which I always carried in my outside service kit for field service.
Ian

User avatar
Stanley
Global Moderator
Global Moderator
Posts: 46766
Joined: 23 Jan 2012, 12:01
Location: Barnoldswick. Nearer to Heaven than Gloria.

Re: Radio Station Rebuild

Post by Stanley » 11 May 2017, 03:37

:grin: I always knew you were a live wire.....
Stanley Challenger Graham
Stanley's View
scg1936 at talktalk.net

"Beware of certitude" (Jimmy Reid)
The floggings will continue until morale improves!

User avatar
PanBiker
Site Administrator
Site Administrator
Posts: 7957
Joined: 23 Jan 2012, 13:07
Location: Barnoldswick - In the West Riding of Yorkshire, always was, always will be.

Re: Radio Station Rebuild

Post by PanBiker » 15 Jun 2017, 10:04

Just realised that I posted my transceiver and computer communication problem in the wrong thread as its station related, never mind.

Replacement lead turned up the other day, 9pin mini DIN from the transceiver to a serial converter opto isolated USB plug. This end makes the USB appear as a standard COM port. Biggest problem was finding where it lived within the devices in Windows 10. I have a six way hub plugged into the ex firewall box and it sits on one of those ports. Took me about 10 minutes to sort out which one was allocated to COM3. The transceiver can link at up to 38400 baud so I set the COM port to the same, 38400baud, 8 bits, no parity and 1 stop bit, no handshaking protocol required.

When I start my data modes client software now it starts receiving on the same frequency that my transceiver is tuned to, selecting a different band or frequency within the software will be tracked by the transceiver and it does the same the other way, software follows any setting I do directly on the radio. I now have about 100 different data modes to play with including Contesia, Domino, RTTY, Throb, Thor, PSK, Olivia, MT63, Navtex, Wefax, CW and even some video data modes. :smile:
Ian

User avatar
Stanley
Global Moderator
Global Moderator
Posts: 46766
Joined: 23 Jan 2012, 12:01
Location: Barnoldswick. Nearer to Heaven than Gloria.

Re: Radio Station Rebuild

Post by Stanley » 16 Jun 2017, 02:48

Crankshaft making is simple compared to this. Deep respect!
Stanley Challenger Graham
Stanley's View
scg1936 at talktalk.net

"Beware of certitude" (Jimmy Reid)
The floggings will continue until morale improves!

Post Reply

Return to “Amateur Radio”