ts-700g

[paul .a larner]

Hi all i was fitting a CTCSS pcb to my radio,one of the small coax cables came off a pcb on the bottom of the radio,i dont know where tho,the other end goes to the psu,if the rig is the right way up the wire joins to the psu rear top left terminal with a couple of other wires,all i measure at the psu terminal is 0.3v,any ideas what voltage it should be? TIA de m3vuv.

[A. non Eyemouse]

On 24/07/2022 18:40, paul .a larner wrote:
> Hi all i was fitting a CTCSS pcb to my radio,one of the small coax cables came off a pcb on the bottom of the radio,i dont know where tho,the other end goes to the psu,if the rig is the right way up the wire joins to the psu rear top left terminal with a couple of other wires,all i measure at the psu terminal is 0.3v,any ideas what voltage it should be? TIA de m3vuv.

That's what happens when you play with deteriorating 1970's technology.
If you've got the manual, there should be a schematic in there. The PSU
in that radio is quite clever, it takes mains down to 12V then it all
goes into a DC-DC converter with 24V for the PA and the varicap tuning
as well as a few -ve rails for the receiver bias. A lot of the internal
wiring used wire-wrap onto posts which is probably very brittle after
40+ years.

You'll probably find a manual on Rigpix if you don't have a paper one.

--
Mouse.
Where Morse meets House.

[paul .a larner]

i am fully aware of what you say,i have the service manual but it doesent tell me what i need to know,ie what pcb's get a feed from the top rear left hand side pin on the rear of the psu when viewed from the top front,if i can get that info it should be easy,cheers 73 m3vuv.

[Brian]

I don’t have a service manual / circuit for the TS700G, only the earlier
700A model. However, I suspect, in this area they are similar.

The ‘coax’ is actually screened wire- similar at first look perhaps.

There are two screened cables in that area on the circuit I have, one is
labelled R8, the other end goes to the Rx / NB unit - both ends labelled
R8. Usually the pins are marked on the PCB. On the PSU, R8 is at the
junction of R16 and 17.

The other is T8, it goes to the AF unit. Again pin T8. On the PSU T8, is
the junction of R20 & 21.

Again, the info is from a 700A circuit but, if you check, you may find it
is the same.

Good old radios. I have one of the digital display versions lurking
(TS700S?)

73
Brian
G8OSN

[paul .a larner]

cheers brian,mine have no markings on them,they are soldered to what look like the male half of a bullet connector,any idea what voltage should be on it at what mode etc,all the radio does is squeel from the speaker at the moment,unless thats feedback with the lna i fitted,diddnt do it before tho,73 Paul m3vuv.

[paul .a larner]

On Sunday, July 24, 2022 at 6:56:57 PM UTC+1, A. non Eyemouse wrote:

[paul .a larner]

where does the wire go on the af pcb?,its ok on the psu end,mine are not marked r8.

[Jim Stewart ...]

welcome back nice brian version....

[paul .a larner]

brian,the wire is soldered ok on the psu end i need to know where the other ie the af pcb end goes ok.

[Brian]

Ah, I thought I’d included that, sorry:

(Also, I think it is TB - the print isn’t clear.)

The other end of TB / T8 goes to three places:

A normally open contact of Relay 2.

R16 (via a pin on the PCB) on the AF board. There should be a group of
three pins near R16. Two on the edge of the board, a third set back. The
centre conductor connects to the pin on the edge furthest from the corner.
The other pin on the edge is the screen. ( third pin is unrelated)

The TX lamp / bulb.

Remember, I have the 700A manual, so check before you connect anything. If
it looks the same, you should be ok.

73
Brian

[A. non Eyemouse]

TS-700A was the US market version of the 700G that covered 144-148MHz.
There was an earlier (no suffix version) with a different front panel
layout (no repeater shift).

[Brian]

Sounds about right.

Either way, I suspect much of the circuitry is common.

[A. non Eyemouse]

On 26/07/2022 13:16, Brian Morrison wrote:
> On Tue, 26 Jul 2022 10:14:13 +0100

> "A. non Eyemouse" <some...@work.invalid> wrote:
>

>> There was an earlier (no suffix version) with a different front panel
>> layout (no repeater shift).
>

> And a 700GII version, which I never knew existed.
>

That would be right because the circuit in the handbook for my 700G
never matched the VFO/mixer board. IIRC mine used discrete devices for
the mixer and the handbook used some analog IC. But it's 20 years since
I got rid of it. Another thing I vaguely remember is that the switching
PSU produced some interesting noise sidebands on the signal.

Just remembered I do still have a bit of it left - the crystal
calibrator. I took this out to fit a RX preamp in the space.

[Rambo]

He is just putting on an act .... there is nothing nice about him ....

[paul .a larner]

>who is this rambo tosser,slagging me off and dont know me from adam,what a wanker!,btw brian found the txb fitted the wire to that on the af pcb and it seems ok,thanks paul m3vuv He is just putting on an act .... there is nothing nice about him ....

[Brian]

Glad to help Paul.

(Just ignore Rambo. He hasn’t pass the Advanced Exam and blames me. )

73
www.g8osn.net

[Rambo]

Since you are using an obviously forged post in order to perpetuate
your persistent lies and slurs against me, is it safe to assume that
the aforementioned forgery emanated from your very own keyboard?

[Jim GM4DHJ ...]

an act is better than nothing

[A. non Eyemouse]

You let me down badly Jim. I was hoping you would spot that one of
Brian's original cache of M3's was a QRO fan.

"projects at the moment include a hf linear using 2x572 valves in
grounded grid mode"

Anyway, here's hoping to spot a nice cheap TS-700G at the next
Horncastle rally.

LOL!
YCMTSU

[Brian]

The only forger here is you. Glad to help.


73 Brian G8OSN

[Jim GM4DHJ ...]

lucky you

[Jim GM4DHJ ...]

this will be it for me this year.....


12 Aug – Cockenzie & Port Seton ARC 27th Mini-Rally Night

Community Centre, Main Hall, Port Seton

6pm, admission £2, tables on first come first served basis.

[www.cpsarc.com]

[Jim GM4DHJ ...]

and this.....

30 Oct – Galashiels Radio Rally

Volunteer Hall, St Johns Street, TD1 3JX

Doors open 11am. Usual traders, Bring & Buy and refreshments.

[Jim GM4DHJ ...]

might manage this.......

27 Nov – Bishop Auckland RAC Rally

Spennymoor Leisure Centre, High St, Spennymoor DL16 6DB

A variety of stalls, including radio old and new, computers, electronics
and a Bring & Buy. Catering and bar facilities on site. There is good
parking, and the rally takes place in a large ground floor hall. Doors
open at 10.30am (10am for disabled visitors). Contact Bob Dingle, G0OCB
on 07710 023916 or email g4...@yahoo.co.uk for more details.

[Rambo]

So says "Judith"

[Jim Stewart ...]

what a gay day ....

[Jim Stewart ...]

what about the doctor ? ....

[Rambo]

Brian wants to be a woman, after all he's pretty useless as a man.

[A. non Eyemouse]

On 29/07/2022 20:12, Rambo wrote:

> Brian wants to be a woman, after all he's pretty useless as a man.

These days he can be one, the other, or anything in between. How about
the name Pamela?

[Spike]

On 30/07/2022 13:58, A. non Eyemouse wrote:
> On 29/07/2022 20:12, Rambo wrote:

>> Brian wants to be a woman, after all he's pretty useless as a man.

> These days he can be one, the other, or anything in between. How about
> the name Pamela?

Has he got the stomach for it?

--
Spike

[Jim Stewart ...]

and the chebs ....