Trio/Kenwood TS-700 on Four Metres

Questions and answers on 4 m transceivers, transverters, antennas, etc.

Trio/Kenwood TS-700 on Four Metres

Postby G4IZH » Mon 20 Jun 2011, 07:27

Hello all, I have just converted a Trio TS-700 to Four Metres, it covers 70.000 to 70.500 MHz all modes and produces 16 watts PEP on SSB.
I have also made a separate VFO for split frequency working, DL/ON stations on 69.950 MHz.
There is quite a bit to do but the results are very worthwhile.
The full details can be found at my website G4IZH.com and clicking on the construction/mods pages.
73
Pete, G4IZH.
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Postby GW3XJQ » Wed 22 Jun 2011, 07:51

Very interesting Pete, just looked at the details on your website.

I have a TS-700G doing nothing and I wonder if you have any comments on converting that version?

Any comments welcomed.

73
Martin, GW3XJQ
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Postby G1HBE » Wed 22 Jun 2011, 09:28

Excellent work, Pete. The great thing about rigs of this age is that not only do they use understandable techniques and real components, but they were built in such a way that allowed us to get our tools in for repair or modification.
I fully agree with your comments re the 'horrible' Jones plug on the mains. Every time I reach around the back of my 780 I get visions of the wife coming home to a charred body. I think I may just fit a proper connector.
Here's what I subjected my TS780 to:

http://g1hbe.webs.com/thets780project.htm
Andy.
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Postby EI7GMB » Wed 22 Jun 2011, 10:32

Gentlemen, both pages are extremely interesting. Thank you!
Resistance is futile.
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Postby G4IZH » Wed 22 Jun 2011, 13:21

Thanks for the comments, Martin GW3XJQ, I am sure the G version will be just the same to modify, from what I remember the main difference is the repeater switch and the dual af/rf gain controls. I used no trimmers, just preferred value fixed capacitors which simplifies the setting up and incidentally the "DRIVE" control still tunes the vari cap diodes in tx and rx but its operation is a little less critical.
I hated that Jones socket for AC and DC supply, that would never be permitted now!
Good luck anyone doing the conversion.
73
Pete.
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Postby G4IZH » Tue 9 Aug 2011, 11:25

Just converted my second Trio TS-700 to four metres, works fine, what is somewhat surprising is the stability of the VFO, it really is very good indeed.
I have replaced the band edge marker with one at 70.2000 MHz as that is much more useful here as GB3BUX is very strong at the bottom of the band.
Pete, G4IZH.
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Postby G4FZN » Thu 9 Feb 2012, 07:25

Hi,

I successfully converted my old TS-700 onto four metres following the comprehensive instructions on Pete's web site. My only problem at first was that the 17MHz crystal wasn't oscillating on its third overtone, but on its fundamental which made for spurious outputs on close-by frequencies. Once I had eliminated the 17MHz, and only had 51MHz, the spurii disappeared, and the output is clean.

I also fitted an small pi-network attenuator between the MIX unit and the FINAL unit to keep the output power down to less than ten watts.

73,
Chris
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Postby G4IZH » Thu 9 Feb 2012, 09:46

Sorrry I missed you when you were in PA Chris, my horizontal aerials are down for maintenance at the moment. I also had a pi attenuator just before the booster but removed it when I fitted the drive pot in the same location enabling me to vary the power output from about 100mW to 17 watts. Incidentally I have been running the rig at full 17 watts output on FM for some months now with no ill effects, certainly no need at all for a fan on the heat sink.
73
Pete, G4IZH.
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Postby PA1PDB » Mon 16 Jul 2012, 05:35

Hello Pete,

I converted my TS-700 to 4M with the help of your information.

Took me only a couple of hours.
I used a 50.970MHz crystal (you advised 51 to 51.6).
I had to add 18P more between TP1 and ground.
The VFO needed only a very little adjustment in frequency.
Output power about 16Watt. :D

Thanks!

73'

Pascal PA1PDB
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Postby G4IZH » Mon 16 Jul 2012, 20:01

:D Very good Pascal, that is a very fast conversion, 2 hours!
Yes, the closer you get to that local oscillator frequency the better as if you have to pull the vfo too far the tracking suffers.
Pleased to see that you get the same output as I do on my rigs.
Incidentally there is a Dutch translation on the net, I don't know if you used that.
73
Pete.
Don't buy it if you can make/modify it!
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Postby PA1PDB » Wed 18 Jul 2012, 05:13

Hi Pete,

I found the dutch translation. I only used the photos. I mainly used youre intructions. I printed all the documentation and read it a view times before starting the conversion. I Printed the circuits and marked the locations for the new parts. This saved a lot of time.

Alligment was easy. I didn't have to use my scope only my grid dip meter and frequency counter.
Thanks

73

Pascal
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Re: Trio/Kenwood TS-700 on Four Metres

Postby PA1PDB » Sun 23 Jun 2013, 12:36

With the Es conditions I worked a lot of stations across Europe with my TS-700. :D
I do not use a pre-amp or poweramp.

73' PA1PDB



http://qsl.net/pa1pdb
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Re: Trio/Kenwood TS-700 on Four Metres

Postby G8JMK » Mon 24 Jun 2013, 20:05

Another successful conversion completed here Pete, can get a full 20 watts but have taken it back to 15w with the ALC control. Receive seems a bit "quiet" gainwise, so I may change the RF amp for a more modern alternative, all that remains is to get some metalwork up in the sky and after 40 years I will have finally made it onto "four".

Now that other TS700, Hmmm, six maybe!.

Dave in Bristol
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Calvin Coolidge (30th Presidentof the United States of America)
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