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View Full Version : SB-220, SB200 and TL-922 QSK Mods



W7RY
09-15-2012, 07:52 PM
I'm offering a well made circuit boards (board only) that does all of the QSK switching and timing for the Heathkit SB-220 and the Kenwood TL-922. Please see http://s900.photobucket.com/albums/ac206/w7ry/SB-220%20QSK%20Modifications/ for pictures. I also offer a universal step start board. Also see my QRZ.com page http://www.qrz.com/db/w7ry for more details.

Comming soon Drake L4B, Ameritron AL-1200, AL-1500 AL-82 as well as the Heathkit SB-200.

73!

Jim W7RY
w7ry at arrl dot net

KB2FCV
09-19-2012, 05:54 PM
Very cool! I'll be watching for the SB-200 board!

AG6K
09-19-2012, 09:55 PM
i'm offering a well made circuit boards (board only) that does all of the qsk switching and timing for the heathkit sb-220 and the kenwood tl-922. Please see http://s900.photobucket.com/albums/ac206/w7ry/sb-220%20qsk%20modifications/ for pictures. ..... ...... Jim w7ry
w7ry at arrl dot net

 what needs to be timed in a high-speed switching circuit jim?

W7RY
11-05-2012, 03:24 AM
The Drake L4B QSK Boards are now ready and on available on line at: http://www.ebay.com/itm/W7RY-Drake-L4B-and-L7-QSK-Board-/281016230575?pt=US_Ham_Radio_Amplifiers&hash=item416ddf62af

Also see my other auctions for more QSK products.

73
Jim W7RY

KA5ROW
11-10-2012, 02:30 PM
did not see anything for the TL-922.

W7RY
11-10-2012, 03:07 PM
did not see anything for the TL-922.

Go to the link shown above and click on "see other items". Or click on this link:

http://www.ebay.com/sch/radioamplifiers/m.html?item=281016230575&pt=US_Ham_Radio_Amplifiers&hash=item416ddf62af&rt=nc&_trksid=p2047675.l2562


73
Jim W7RY

W7RY
11-10-2012, 07:41 PM
I am not really seeing an advantage with your qsk system. Your electronics relies on the speed of a vacuum relay(s) for the overall speed. At best this is going to be around 6ms which is much slower (guessing) than an Ameritron pin diode qsk accessory they have sold for a long time. I don't use qsk and never have so maybe I'm missing something.

The Ameritron qsk system does not use relays for speed but it isn't cheap either. Vacuum relays aren't cheap when bought new but there are enough surplus ones around, but they are mechanical.

So I can see a cost advantage with your device but the Ameritron seems to be a better overall device. On the other hand I never used either type of qsk, but I think the comparison is interesting.

Please stop guessing... Because your guessing is wrong. And yes, you are missing something.


2 to 4 ms is all that is needed for speed.
Relays are more reliable than PIN diodes. The Ameritorn uses PIN diodes. (Or diodes acting as PIN diodes).
PIN diodes are VARY expensive. Around $100.00 + each.
The PIN diodes Alpha uses, are hundreds of dollars each. And they quit quite often. (Alpha has quit using them).
All of the transceivers that I have tested, start putting out RF, 6-8 ms after the amplifier keying line switches. (See the first bullet point).
My boards also incorporate "soft keying" so only 10 volts at 1ma is all the voltage and current that is switched. My boards also have a provision for positive going PTT.
The SB-220 and the TL-922 have 120 volts DC at the relay jack. Most modern transceivers will not handle that voltage. (Whatever Rich).
My QSK Boards also include adjustable bias. No need for zener diodes any more. You can set the ZSIC (zero signal idling current) to whatever current you want.
My system is more reliable and cheaper than the Ameritron.
Because my system has the capability of positive keying voltage, you can use +voltage to key the amplifier in the case of an Icom IC-7000.
See http://www.w0qe.com/amplifier_timing.html for measurements of amplifier relay speed measurements for many different types of rigs.
My system is much simpler and easier to troubleshoot and uses common leaded componets.
My system contains no microprocessors to lock up or cease to function in high RF environments.
QSK relays are not limited to QSK CW operation. Proper relay timing is a REQUIREMENT for proper amplifier performance to stop arcing in the plate tuning capacitors and band switch.
QSK relays make for extremely quiet operation of the amplifier switching system. A pleasure to use when operating VOX during rag chews.


Any questions?

73
Jim W7RY

K1ZJH
11-10-2012, 08:20 PM
Just curious if you provided a compatible QSK TX enable in/out line for the TenTec transceivers. Their amps have loop through keying for QSK.

Pete

W7RY
11-11-2012, 06:18 AM
See http://www.w0qe.com/amplifier_timing.html for measurements of amplifier relay speed measurements for many different types of rigs.

My relays switch in 2ms. Please see the above link. 2ms is more than enough time for full QSK at 50 WPM.

73
Jim W7RY

W7RY
11-11-2012, 06:24 AM
Oh... And I substantiate my "claims" (they are not claims, they are fact), with my documentation, I send scope traces of the relay times.:o

73
Jim W7RY

K1ZJH
11-14-2012, 04:34 AM
See http://www.w0qe.com/amplifier_timing.html for measurements of amplifier relay speed measurements for many different types of rigs.

My relays switch in 2ms. Please see the above link. 2ms is more than enough time for full QSK at 50 WPM.

73
Jim W7RY

Regardless, rigs like the Omni VI and Paragons require a loop through contact closure from the amplifier to confirm that the
antenna change over is ready for RF power. Otherwise, the rigs will supply a relay closure that greatly limits the QSK turn around
time. There are some mods to use the T voltage on the control board for true QSK for non TenTec amps, which works fine on my
heavily modified SB-220. From the lack of response I guess your board doesn't provide any compatibility with Ten Tec equipment?

Pete

W7RY
11-14-2012, 05:32 AM
Pete...
At this time, my board does not have any provision for this.

It would take a timing circuit to keep the exciter off until the relays are closed. There are no spare contacts available on the relays to provide a delayed (approximately 3-4ms) output to go to the Ten-Tec radios. It could probably be done with a RC constant and a couple more transistors-FETs. I'll take this under advisement. And see how I could incorporate it into my future designs.

When I have an Ameritoron amp back on the bench, I'll do some testing. My Ameritron board has an additional FET transistor that is used to turn on the PTT LED that is on the front panel of the AL-80A, AL82, AL1200, AL1500 and Heathkit SB-1000. So that may be a possible way to have an output to key the Ten-Tec. I have the manuals for the Ten-Tec Titan so I can look at that to see how they accomplished it with that amplifier.

Thanks.
73
Jim W7RY

K1ZJH
11-14-2012, 05:46 AM
Hi Jim

Since Ten Ten and QSK pretty much go hand in hand, it might be something you might consider for future revisions... I own a Paragon II and an Omni VI... hence my interest. I use the T voltage on the controller boards with power fet to key my SB-220. But that mod requires digging into the Omni and making modifications that most owners probably wouldn't want to do.

73

Pete

K8BTT
11-20-2012, 04:49 AM
Jim it looks like a really well thought out qsk board. Ill buy one soon and make it my winter project.
Thanks

Colin
K8BTT