Search found 66 matches

by BillPaul
Mon Nov 10, 2014 11:59 am
Forum: Modification Maddness
Topic: TS-850/DSP-100 setup HELP!!
Replies: 2
Views: 8650

1) For TX in SSB modes, I don't think you need to bypass the 455Khz filter when you have the DSP unit on. The DSP unit is effectively doing the 1st IF filtering for you (the balanced modulator isn't used). You do want to put the 8.83Mhz filter in the bypass position (that filter is used both with an...
by BillPaul
Wed Nov 05, 2014 2:33 pm
Forum: The Audion Connection
Topic: Major RFI/Grounding Problem
Replies: 12
Views: 17176

If I really did rock, I wouldn't have botched the part number for C136, twice. (Once I called it Q136 and the second time I called it C147. This is what I get for typing too fast at work. I went back and fixed things up.) As for sampling the audio, I'm not quite sure. I mean, you can sample the audi...
by BillPaul
Tue Nov 04, 2014 2:26 pm
Forum: The Audion Connection
Topic: Major RFI/Grounding Problem
Replies: 12
Views: 17176

I got curious so I dug out my PDF of the 440 service manual and took a look. From what I can tell, the audio input from the ACC2 port (pin 11) goes to J25 on the IF unit. From there it goes through J23 to the mic gain knob on the front panel. Then it returns back to the IF unit before going to C133 ...
by BillPaul
Mon Nov 03, 2014 6:16 pm
Forum: The Audion Connection
Topic: Major RFI/Grounding Problem
Replies: 12
Views: 17176

The "C131 mod" only applies to the TS-870. You can likely to something conceptually similar to the TS-440, but it will likely involve more than just one cap, and the part numbers will be different. Start with the schematics in the TS-440 service manual and just follow the audio path from the ACC2 po...
by BillPaul
Wed Oct 29, 2014 3:31 pm
Forum: The Audion Connection
Topic: Major RFI/Grounding Problem
Replies: 12
Views: 17176

I have a couple of questions: 1) How are you connecting the output of the MIC2200 to the radio? I know you're connecting to the ACC2 port on the back of the rig, but what I'm asking is how exactly did you cable up the MIC2200 preamp to the ACC2 plug? 2) What band(s) does the squeal occur on? I don't...
by BillPaul
Thu Oct 23, 2014 12:13 pm
Forum: Yak, Yak, Yakity, Yak.....
Topic: Strange things happening with my TS 950 SDX (and amp?)
Replies: 2
Views: 12958

I mentioned this in reply to your e-mail, but I'll repeat it here for the benefit of others. There are a couple of well-known problems with the TS-950SDX that can result in distorted audio. Usually the problem is that the TX audio in single sideband modes sounds raspy or warbly. The severity of the ...
by BillPaul
Tue Oct 21, 2014 11:14 am
Forum: Modification Maddness
Topic: ACC2 on my TS440
Replies: 2
Views: 8810

First, get a copy of the TS-440S service manual. I think there's several PDF scans of them out there on the web which you can find with minimal googling. I also have this one: http://people.freebsd.org/~wpaul/station/TS-440S_Service_Manual.pdf Follow the ACC2 audio input path (which if I remember ri...
by BillPaul
Fri Oct 03, 2014 1:38 pm
Forum: Modification Maddness
Topic: Another TS-850S Question
Replies: 2
Views: 8112

On AM mode, with the KA0KA mods (feeding the modulator directly and bypassing the 8.83MHz and 455KHz IF filters), you should be able to get about 9KHz to 10KHz of audio bandwidth. On SSB... well, you shouldn't operate the rig like this on SSB. You really need the DSP-100 unit. In "analog" mode, the ...
by BillPaul
Mon Aug 11, 2014 4:59 pm
Forum: Tricks of the Trade
Topic: INRAD filters - I am confused again!
Replies: 9
Views: 18149

Okay, in regards to the INRAD filter documentation, I'm not sure what's going on there.The photo shows that it's mounted on a plug-in board. The only reason I can think of to remove that board is if you wanted to mount the filter in place of one that's already soldered into the radio. Some rigs did ...
by BillPaul
Mon Aug 11, 2014 4:30 pm
Forum: Tricks of the Trade
Topic: MENU item 19 and TS950 SDX
Replies: 1
Views: 5681

Menu 19 does in fact work in SSB mode, including the BPF settings. It may also work in CW mode, though I don't remember off the top of my head, and I'm not in front of my radio right now so I can't test it. I know it does not work in AM mode. This is because the DSP unit is not used for AM receive f...
by BillPaul
Mon Aug 11, 2014 11:35 am
Forum: Tricks of the Trade
Topic: INRAD filters - I am confused again!
Replies: 9
Views: 18149

Oh, I almost forgot something. There's another menu setting which may be handy here. If you look at the owner's manual, section 4-2-13, they describe the "Power ON" menu functions. These are basically preference settings which you normally don't need to change very often. You have to press and hold ...
by BillPaul
Sun Aug 10, 2014 12:45 am
Forum: Tricks of the Trade
Topic: INRAD filters - I am confused again!
Replies: 9
Views: 18149

Okay, I guess I misunderstood. When you mentioned the AM filter, I thought you were interested in AM operation. The way the SDX works, it comes from the factory with 6KHz and 2.7KHz filters pre-installed in the 2nd IF stage. The computer forces the use of the 2.7KHz filter on SSB on transmit, and th...
by BillPaul
Fri Aug 08, 2014 4:02 pm
Forum: Tricks of the Trade
Topic: INRAD filters - I am confused again!
Replies: 9
Views: 18149

There's a couple of problems with what you want to do here. You state that your goal is to widen your AM response. That being the case, filter #475 is not going to help you at all. In fact it's going to make things worse. An AM signal is composed of three pieces: the carrier, an upper sideband and a...
by BillPaul
Mon Jul 07, 2014 12:36 pm
Forum: The Audion Connection
Topic: Phase reversal on MIC2200 pre-amp
Replies: 4
Views: 8634

(I know this question has been languishing for a while, but I only just noticed it. I figured I may as well chime in.) The phase reversal feature on the MIC2200 basically flips your audio waveform upside down. It's sometimes used for noise cancellation in pure audio applications (audio engineers som...
by BillPaul
Wed Apr 23, 2014 12:47 pm
Forum: Tricks of the Trade
Topic: Assistance Requested for my TS950SDX
Replies: 5
Views: 8938

Just to be clear, there are two phases here: 1) Use some power-on tricks nable a couple of hidden features 2) Make use of those features later To simplify it: Phase one: - Press and hold FINE key while powering up - Press and hold SCAN + right M.CH key while powering up and set service menu option 1...
by BillPaul
Fri Apr 18, 2014 2:27 pm
Forum: Tricks of the Trade
Topic: Assistance Requested for my TS950SDX
Replies: 5
Views: 8938

You left out some information: - You said you changed settings in menu options 20 and 21, but didn't say just what settings you tried. - You didn't say what means you used to evaluate the audio. (Are you listening via the monitor with a pair of headphones? Listening on a second rig? Getting radio ch...
by BillPaul
Tue Apr 08, 2014 10:35 am
Forum: Sale, Sale, Sale!!
Topic: PLEASE: DC-DC Board for TS-850 - X59-1100-00 *PLEASE*
Replies: 7
Views: 15938

Well, the replacement boards showed up, and I have the new circuit installed. The TS-850 seems to be working fine: the ALC behaves as expected. Below is a photo of the replacement board with parts fitted, along with two blanks and the original. (Why did I get 3? Because OSH Park's minimum order is 3...
by BillPaul
Tue Apr 01, 2014 4:17 pm
Forum: Sale, Sale, Sale!!
Topic: PLEASE: DC-DC Board for TS-850 - X59-1100-00 *PLEASE*
Replies: 7
Views: 15938

FYI, I recently started having trouble with the DC-DC converter circuit in my TS-850 as well. (Luckily I still have that dusty old TS-950SDX backup radio to tide me over. :) ) While deciding what to do to it, I stumbled across this article: http://oz1bxm.dk/TS850/ts850-repair.html It states that the...
by BillPaul
Wed Oct 02, 2013 1:46 pm
Forum: Tricks of the Trade
Topic: KENWOOD T-S 850s VS. ICOM 775dsp "WHICH TO VOODOO"
Replies: 3
Views: 9386

Hm, I dunno, that's a tough one. I see there are mods for the 775DSP to open the TX bandwidth up to 4.5Khz. That's pretty good, but the TS-850/DSP-100 combo will do about 6Khz, so it wins in that department. It also has an advantage on the RX side since the DSP-100 is used for both transmit and rece...
by BillPaul
Wed Jul 31, 2013 5:44 pm
Forum: Modification Maddness
Topic: Service Menu Access HELP
Replies: 4
Views: 12729

astro: Your instructions appear to be for the TS-590S (five ninety). Pat was asking about the TS-950SDX (nine-fifty).

-Bill, N1GPT