Re: RF Amp for HT-1
Tim If you don't get an answer, there is a QRP Labs group on this system that he monitors. 73 Howard
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K4LXY <k4lxy.cw@...>
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#3167
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Re: RF Amp for HT-1
This is a question on the output transformer on the 50W PA from Hans (who appears to read these posts).? This uses a phasing transformer as the power feed.? It seems that the Phasing choke adds an
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Timothy Fidler
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#3166
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Re: RF Amp for HT-1
Thanks, Hans 73 Howard K4LXY
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K4LXY <k4lxy.cw@...>
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#3165
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Re: RF Amp for HT-1
Hi all I don't like unnecessary use of relays compared to solid-state because they are relatively: 1) Expensive 2) Slow 3) Noisy 4) Large 5) Heavy 6) Unreliable There are applications where use of
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Hans Summers
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#3164
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Re: Somewhat deaf D4D
Hi Adam, Short circuiting X1 did it. The receiver is back to life with the usual performance. Regards, Pedro LU7DID
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Dr. Pedro E. Colla (LU7DZ)
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#3163
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Re: RF Amp for HT-1
I'm guessing that a MOSFET solid state relay will be the way to go. ?The DC line to the transmit LED provides a little over 4v. ?I've not used MOSFET relays before but I plan to experiment with one.
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K4LXY <k4lxy.cw@...>
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#3162
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Re: RF Amp for HT-1
A reed relay is very responsive so it should work, though I'd really like to get rid of the relay. ?Maybe my next project. ?Be sure to put a reverse diode across the relay to prevent damage. The amp
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K4LXY <k4lxy.cw@...>
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#3161
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A small piece about HeathKit
Folks, Recently I focus on supply chain and manufacturing in my professional work, and I visited 10 OEM factories in the past two weeks. In my piece, I wrote that it might be good training material to
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Adam Rong
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#3160
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Re: RF Amp for HT-1
Thanks for sharing this, Howard. By controlling by a relay, is it still okay if you send really fast? Thanks, Adam
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Adam Rong
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#3159
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RF Amp for HT-1
The QRP-Labs 50W amplifier makes a great (and inexpensive) single-band amp for the HT-1A. https://www.qrp-labs.com/50wpa.html To key the amp, a 5v keying line is needed from the HT-1. ?On the HT-1
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K4LXY <k4lxy.cw@...>
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#3158
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Edited
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1000 members
Folks, 1000 members for the first time. During the lockdown period, let's build something. Thanks, Adam
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Adam Rong
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#3157
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Re: CS-40V build
The tracking at http://www.ems.com.cn/english.html says it departed Shanghai on March 20. My shipping agent told me a week ago that we should expect more than one month for France. The COVID-19
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Adam Rong
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#3156
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Re: CS-40V build
Hello Adam I have not receive my D4D for JS8. 73 Gilles F1BFU
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F1BFU - Fr - 79
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#3155
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Re: CS-40V build
If you feel weird to turn Gain pot in reversed direction, you can de-solder the gain pot and turn 180 degree and use jumper wires to connect like III I am looking forward to your progress of the
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Adam Rong
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#3154
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Re: Somewhat deaf D4D
Hi Adam, Thank you for your kind reply. Relay seems to be good. Will try during the afternoon the other two tips. 73 de Pedro, LU7DID
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Dr. Pedro E. Colla (LU7DZ)
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#3153
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Re: Somewhat deaf D4D
Hi Dr. Pedro, Please measure relay contacts with ohm meter. Also, please short the crystal in front end with a 103 or 104 cap to see if it improves. Also please check the contact of the audio out jack
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Adam Rong
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#3152
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Somewhat deaf D4D
Hello, I've been using the D4D as part of my FT8/WSPR beacon and monitoring station for several months now, very good performance I must say. However, recently, it stopped working. It was not able to
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Dr. Pedro E. Colla (LU7DZ)
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#3151
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Re: Home brewing is good for home staying
Adam and All, Yes, I wrote the HT-1A article to Japanese CQ magazine. The reputation of this small gem rapidly spread in nation wide and this is faster than the damned virus. My preparation stock in
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qrpjl1kra
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#3150
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Home brewing is good for home staying
Folks, Japan CQ magazine just published an article about HT-1A CW Transceiver Kit and it brought many more orders than expected. Perhaps home brewing is one of the best choices while home staying due
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Adam Rong
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#3149
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New file uploaded to [email protected]
Hello, This email message is a notification to let you know that the following files have been uploaded to the Files area of the [email protected] group. * /D4D Kit Documentations/D4D.pdf (
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[email protected] Notification <crkits+notification@...>
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#3148
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