TS-180S Repair Part 3 : Recovery in progress, but the Body Count is Increasing ...

I am aware that it has been a while since my last update on this subject, but work has been progressing quietly in the background as my limited free time has allowed. At least once careful consideration was given to this old lady "becoming a projectile", or to be more serious whether a time was approaching when I would could my losses and put it to one side as it seemed to be taking over my life! However after a brief break I rolled up my sleeves and carried on ...

I am pleased to report that this transceiver now works as a receiver, albeit not on all bands yet, and the frequency display isn't functioning. The time is fast approaching when I will check out the transmitting capability and performance of this venerable transceiver.


The replacement of the dead 2SC1907 in the Q14 position (PLL WBA) allowed me to move on to the next fault (there always seems to be a "next fault" with this radio!) - it still appeared that the PLL circuitry was the problem area.

I revisited the Premix Unit, and although all the various signals appeared to be there I was not convinced that the RF levels were all that they should be.   The Service Manual is rather vague on expected RF levels, though it is very good at expected DC levels around key parts of the circuitry.

Meanwhile, back at the PLL Unit I discovered that the amplified VCO outputs which are fed to the Premix Unit were suspiciously low whereas the VCO output levels themselves seemed to be reasonable.

TS-180S - PLL Circuit (Part)

Attention was therefore drawn to the output stage of this part of the circuit (see excerpt from the circuit), and probing around with my DVM revealed that Q2 (another 2SC1907) had just over a volt between its base and emitter and that Q3, the "unlock output mute" transistor had no volts on its collector.  The other voltages were not very close to those suggested by the Service Manual.

Small signal transistors with a volt showing across base and emitter simply aren't transistors any more (it's a kind of Law of Physics!) and clearly the load choke of the mute transistor was open circuit.

The transistor and choke were replaced, and the radio burst into life! Furthermore, replacing the components restored the DC voltages to being very close to those suggested by the Service Manual, an interesting lesson there for future use. (Note to self:- check the DC voltages first!)

It is interesting to ponder that both of the u/s transistors found so far in this circuit were identical types.  This possibly suggest a quality issue with the manufacturing as I strongly suspect they would have been made at the same time, more than likely from the same piece of material.   Worryingly there are a few more 2SC1907s in this radio!

 Now I have a radio which appears to work as a receiver on most but not all bands - there appear to be some alignment issues still with the PLL, but the frequency display now just shows the "base" frequency for each band, in short the counter isn't working.

I spent a little bit of time investigating the counter issue, and again I am not convinced the signal levels are quite sufficient.  The counted signal is a 40-40.5 MHz VFO-locked signal from the Premix Unit and has to be amplified to a sufficient level to interface with TTL (yes, TTL!) chips, and I don't think this is quite happening, but when I lifted the circuit board to investigate the underside I had a bit of a shock!

TS-180S - counter underside

The components underneath were a surprise, and suggest that the layout of this board isn't what you would call "Kenwood's Finest Moment"!.  However to be fair the added bits are shown in the Service Manual layouts, if you look carefully, and are, in the main added decoupling components to the TTL chip supply pins, or the tying down of unused pins.

Re-sweating some suspicious-looking joints and plated-through holes didn't appear to make any difference, but it's early days yet ...

Weekends are just too short!

Working away from home during the week inevitably that the weekend proper gets off to a slow and delayed start.

Generally I am so pooped on Friday evening that I am incapable of doing anything remotely demanding, and 24 hours later I am just starting to feel like myself again.

This is how it was last weekend.

Then there is the lawn mowing, plus doing the same for a neighbour who has had the misfortune of having had a heart-attack recently.

The band had a gig too, so that took care of Saturday.

Then there is the paperwork.  You have to be very careful working away that things don't get missed, credit card bills and the like.

What I am trying to say is that, even though the transistors for my TS-180S had arrived, I never got round to fitting the replacement into my PLL WBA.

However, a chance conversation with a colleague about a really neat application from the Sysinternals people (now assimilated by the Borg (sorry, Microsoft!)) called "Desktops" which allows windows users to have multiple desktops in the same way that Ubuntu users have been able to for quite some time.

This little program was downloaded in a trice and installed almost as quickly, and WOW it really is great!

If you do bizarre things with PCs like I do, then this little gem is a godsend.   However, my rather bizarre setup involves having three PCs on line (one is remote in the shed, the other two in my house "radio room") and as all three PCs how potentially have four desktops available at the click of a mouse, then you can guess how confused a fatigued brain can become.

First Es (Sporadic-E) Opening of the Season

My radio friends know that I spend a lot of energy (mental and electrical) monitoring distant Band I TV stations looking for and recording the effects of meteors on the propagation of signals between that remote transmitter and myself.

A side effect of this is that when Sporadic-E (Es) propagation occurs at the critical point along that path, the effect is obvious.

I was only commenting to two local friends two days ago that this year's Sporadic-E season seems to be late in starting, and my friends were in agreement with that statement.

This morning's events though took an interesting turn at 0906 GMT when the path from Ostrava in the Czech Republic was suddenly enhanced by a burst of Es which lasted for around ten minutes.

The frequency used by the Ostrava TV transmitter is 49.76MHz, just below the amateur "six metre" allocation.

(above) R_Meteor Trace of first Es Opening

SpectrumLab Trace of Es Opening (note +/- 25Hz Sidebands)

By a bizarre coincidence, as I type this entry, I have just heard a Spanish station EA3FER calling CQ in CW on 50.092MHz and shortly after another Spanish station, this time an EA6 call from the Balearics, so it appears that the 6-metre Es season has finally started!