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T1154 Transmitter




 
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August 20, 2019, 02:16:06 AM *
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Author Topic: T1154 Transmitter  (Read 296 times)
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SM6OID
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« on: August 03, 2019, 12:57:12 PM »

Hi!

Currently I have a T1154M transmitter in the workshop, so far I have good power on all bands.
Modulation is awful, carrier too high.
Running it from stabilized power supply, a bit shy of 1.2 kV.
It's a MOPA.

Frequency coverage:
200-500 kHz (yellow)
2.35-4.5 MHz (red)
4.5-8.7 MHz (blue)
8.7-16.7 MHz (blue)

Very colorful user interface as can be seen on the attached picture.
To the left, set frequency
To the right, output network
In the middle, tubes and meters.

MO is a ML6 triode, Modulator/side tone etc ML6
PA is two parallel PT15 pentodes, suppressor modulated.
Output power, I see approx. 60 W on 20 meters and a hair shy of 90 W on 80 meters, all on CW.





 


* SM6OID T1154.jpg (145.14 KB, 784x441 - viewed 48 times.)
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RADIO: 51J-4, R-390A, SP-600 JX-21, BRT-400, Set No 19, T-47/ART-13, RF-590, SRT CR91, BC-312D, BC-348Q, HF-8020/8030/8010A/8090,  and much more...

ENGINE: Zvezda M50 F6L (V12), Rolls-Royce Meteor mk4B/2 (V12), Rolls-Royce B80 (inline 8 ) and much more
PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #1 on: August 03, 2019, 01:24:45 PM »

The modulator tube and the oscillator shouLd be  vt105. i never tried an ML6. The DC voltage at the third grid of the VT104 is quite critical for a good modulation. I had a leaky capacitor in the modulation circuit upsetting the DC level at G3 which resulted is a bad modulation.  The power at AM should be approx 20 Watts. When you get 90 Watts at CW, thats a lot for the T1154. (A 1154 TURBO?) Check the DC voltages at G1, G2 and G3
You are lucky to have a complete set, mine was ""modified"" Cry when I found it and I had to build it up again to have it working. No driver coils, no oscillator coil, CW relay gone, modified output circuit etc. And the yellow section completely removed. But it works again at the HF bands.
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SM6OID
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« Reply #2 on: August 03, 2019, 01:53:38 PM »

Nico, they are both VT105, ML6 is just another name for the tube.

From what I've read, the output is not normally 90 W or so, but as you say, I have the Turbo version.
Previously I did work quite a bit with turbo systems on cars, as a Master Technical Trainer at Saab Automobile, so just following that tradition.

I will perform a complete check up, once I've put together some cables of the slightly more permanent type, lab cables and alligator clips, could be a bit unreliable...

I'm impressed of what you had to do with your T1154, that must have been quite a task to perform!
I must say that I've been lucky so far, nothing really problematic and only mechanical stuff.
 
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RADIO: 51J-4, R-390A, SP-600 JX-21, BRT-400, Set No 19, T-47/ART-13, RF-590, SRT CR91, BC-312D, BC-348Q, HF-8020/8030/8010A/8090,  and much more...

ENGINE: Zvezda M50 F6L (V12), Rolls-Royce Meteor mk4B/2 (V12), Rolls-Royce B80 (inline 8 ) and much more
KA3EKH
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WWW
« Reply #3 on: August 06, 2019, 09:16:36 AM »

Wow, you Da man! You have an ARC-5, ART-13, BC-375 and now a T-1154
Do you have the R-1155 receiver to go along with it? I had one couple years back and remember that I had to change every capacitor in it. They were all open, every one. Hope they did not use the same cans in the transmitter. Also they used combo capacitors in all the bypasses that were a can with three or four 0.1 or something like that that were not only open but also the insolation on the wire fell off the wire as soon as you touched it. The T-1154/R-1155 were to the British what the BC-348/ART-13 were to the Americans but having worked on and converting tons of this stuff the British stuff just donít age anywhere as well as the US stuff.
Have lots of other stuff around the same age like the Russian US-P receiver that appears to have held up better than the Brittís stuff. Donít have any German or Japanese sets so canít speculate on them. Been working on getting a Torn EB but donít have one yet.
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SM6OID
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« Reply #4 on: August 14, 2019, 05:34:10 AM »

Hi!

No, no R-1155 yet, will se if it happens.
As far as I understand, the receiver requires plenty of work to be OK, wires and caps.
Luckily, that is not the case with the T-1154!

Tried to reduce the supply voltage to 940 V, and got this modulation pattern.
Not super great, but no too bad.
Still, something needs to be fixed!


* SM6OID T1154 940V feed.jpg (33.38 KB, 393x322 - viewed 8 times.)
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RADIO: 51J-4, R-390A, SP-600 JX-21, BRT-400, Set No 19, T-47/ART-13, RF-590, SRT CR91, BC-312D, BC-348Q, HF-8020/8030/8010A/8090,  and much more...

ENGINE: Zvezda M50 F6L (V12), Rolls-Royce Meteor mk4B/2 (V12), Rolls-Royce B80 (inline 8 ) and much more
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