The AM Forum

Does anyone have info on this mod? I was told it may have been in an er issue, perhaps.

There are more than one set of mods for the Apache. The link below is one.

http://amwindow.org/tech/htm/w3sccmods.htm


BTW, doing a Google search on "apache audio modifications" brings up the link above #1. An AM Press/Exchange article, which is the same schematic as in the link above, shows up as number 3 on the search. There are some others in the list too that you might want to check out.

I should have been more clear. I am looking for the mod to add 160 meters to the Apache, I am aware of the audio mods.

OK. Hmmm, seems I've talked to someone that did that but I can't remember who.

Might be easier to get a DX-100.  ;)

I think it may have been John K1DEU from listening in to a QSO back in the day.
He has a website: www.hamelectronics.com

Al

Naw, I think John's gone off the deep end, his website now is: http://www.SpiritualPeaceProject.com/

Haven't  heard or worked him on 75 now for several years or longer,
probably 6 or more years...

I think it was Pete W1VZR,seems I recall him telling me abt it ,I was using an Apache on 10meters at the time
dale/ka5who

Jay, WA2IXP who is a member on AMfone modified his some years back for 160M.  It was his own mod and worked very well.  He regained all of the other bands if I recall correctly.  Did it with small relays at the appropriate circuit points.  I probably worked him in the 80's with it on top band. 

Joe, W3GMS

Yes, it was John K1DEU. Looks like he hasn't renewed that domain name hamelectronics.com, with all the great amateur radio information there. He is a member on this site so you could try and send him a PM.

Al

Regarding K1DEU's defunct website and MANY others..


http://web.archive.org/web/20051124194252/http://www.hamelectronics.com/k1deu/

The "WayBackMachine"

http://archive.org/web/web.php

you must know the web address for the query..
I see no mention of the TX-1 160 mod..
regards,
Jeff

You would have to be W1VZR to pull of a 160M mod to an Apache. Hi.

The VFO tunes 1750 to 2000 kHz so that works. It may pull a bit but it seems that there is plenty of buffering. Or you could use a 160M rock. The thing does crystal control no problem.

The absolute easiest mod is to give up 75M. The bandswitch still works but no 75.

Replace the 100pf cap to the Xtal/VFO Swich on the 6Cl6 buffer with a 470 pf trimmer. This will resonate it to 160M.

The 10 mH driver choke works fine on 160M (in the 80M position).

Add a T-200-2 Torriod inductor with 25-30 turns of # 12 enamelled on it in series with the tank to get 160M.

Loading should be OK.

Mike   WU2D

 

Thanks Jeff for the Way Back Machine link here.

Just to clarify..I did write that I would listen in to QSOs on 160m back in the 90s with John DEU and Dave KSZ in Dekalb Junction NY and others from time to time..including Pete VZR discussing a mod to the Apache for 160m operation.

The website offers some great ideas and schematics in general on improving many 100w class AM rigs to perform better on 160m or pad the finals to allow them to be used on 160m. Check here:

http://web.archive.org/web/20050313085409/http://hamelectronics.com/k1deu/pages/ham/transmitters/pages/pi_net_padding.htm

All very good stuff there for sure.

Al

W1JZ modded a 32V Collins for 160.

160 meter mods for the 32Vs were published in one of the major rags (QST, CQ, 73) back in the 50s/60s.

I had done this mod along time ago as Joe had mentioned. I unhooked the xtal/vfo sw. and used it to add a 510 uuf  (I think) cap across vfo buffer plate choke to get 160 output and to operate two relays. One was mounted in the driver coil compartment and added (or shorted out ) a coil of small wire on a 1" form. For the final I removed the top cover with the fan and put a piece of glass board across one end holding about 25 turns of 2.5 " coil cut in half side by side. There was still room over the tubes for a muffin fan. Relay was mounted on left wall just ahead of tubes. Added coil(s) were in series with cold end of tank. The relay below was small. The relay in the tank circuit was a plastic cased octal base type with the guts removed. Worked great. VFO was ok even on cw. I had sketched this out and sent it to a few guys but don't have details anymore. Way before easy pix and the internet. Also changed the driver transformer, stabilized mod bias and swapped locations of the spot and audio gain control to put the latter closer to its associated circuits because of so rf feedback on ten meters. Torroids would be the way to go.
                                                                                                    Jay-

This is the 160 mod I'm most familiar with. Very effective and when you figure in time, parts, and frustration, it's the cheapest/least invasive.  ;)

Or build a simple 160 transverter that down converts 80 meters to 160 and use the Apache to drive it. Run the Apache finals off the low voltage supply.

One of us may convince someone to run a power amp off a low voltage supply someday.

Cool to build it in the SSB converter box so it matches.....

When I built my first 6 meter transverter I couldn't find a spare SB-10 box, so I had to use some other square cabinet but I did paint the cabinet to closely match the Apache cabinet color. In my combo, the Apache drove the SB-10 and the output of the SB-10 drove the transverter.