开云体育

SSB Calibration blown finals

mux_folder2001 All Messages By This Member #141531 开云体育 I have been running TN0110 finals and I calibrated my QMX+ with them. I wanted to see if the BS170 produced different curves so I installed BS170s and ran the calibration. When I was done, the finals were blown. I wonder whether or not Hans is using the shaping when he is keying the radio for the cal sweeps. The cal results didn't look substantially different from the TN0110 so I have gone back to the TN0110 and I am recalibrating. Tony AD0VC
Richard Dyer All Messages By This Member #141532 How did you deal with the reverse mounting/heat sink issue? I have purchased a set of those transistors just in case.?
Bruce Akhurst All Messages By This Member #141538 Fascinating. ? ?Would be more so with : supply voltages that blew them? power outputs that blew them? where the BS170’s came from? how they were mounted? 别迟肠…? ?
[email protected] All Messages By This Member #141543 On Sun, Mar 23, 2025 at 11:15 PM, mux_folder2001 wrote: TN0110 What is the highest frequency you are using the TN0110s on?
Nate Reik N8BTR All Messages By This Member #141552 Richard, I did this in QDXs with a Wakefield heatsink I drilled and tapped.? ? ? -Nate? N8BTR
mux_folder2001 All Messages By This Member #141567 开云体育 In the QMX+ I just mount them face up with the washer as usual. In my QDXs I have experimented extensively with heat sinks and I found that heat was never an issue. I do not run WSPR, mainly FT8. Tony AD0VC toggle quoted message Show quoted text From:[email protected] <[email protected]> on behalf of Richard Dyer via groups.io <rdyer39@...> Sent:?Monday, March 24, 2025 1:16 AM To:[email protected] <[email protected]> Subject:?Re: [QRPLabs] SSB Calibration blown finals ? How did you deal with the reverse mounting/heat sink issue? I have purchased a set of those transistors just in case.?
mux_folder2001 All Messages By This Member #141568 开云体育 This is a 9 volt build. It is supplied through an LM338 regulator adjusted for 9 volts. The regulator input is from a 12 volt linear bench supply. The BS170s came from Mouser. They were mounted normally. Tony AD0VC toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of Bruce Akhurst <bruce@...> Sent: Monday, March 24, 2025 3:43 AM To: [email protected] <[email protected]> Subject: Re: [QRPLabs] SSB Calibration blown finals ? Fascinating. ? ?Would be more so with : supply voltages that blew them? power outputs that blew them? where the BS170’s came from? how they were mounted? 别迟肠…? ?
mux_folder2001 All Messages By This Member #141569 开云体育 10 meters but they give good output on 6. Tony AD0Vc toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of adam via groups.io <adam@...> Sent: Monday, March 24, 2025 4:56 AM To: [email protected] <[email protected]> Subject: Re: [QRPLabs] SSB Calibration blown finals ? On Sun, Mar 23, 2025 at 11:15 PM, mux_folder2001 wrote: TN0110 What is the highest frequency you are using the TN0110s on?
Tony Scaminaci All Messages By This Member #141634 Hi Tony, It’s good to hear that the calibration using TN0110 was similar to that of the BS170. I was initially concerned about SSB performance but when Hans mentioned his calibration technique, I had one of those Ah-Ha moments with hopes for a good outcome. Thanks for running the calibration on both devices. Over the past year or so, it seems we came to an unofficial conclusion that BS170s were blowing due to high drain voltage as a result of high SWR or exceeding 12VDC at the supply input rather than overheating due to high current. TN0110 has a significantly higher drain voltage advantage over BS170 (100V vs 60V) and if it works well with SSB, I’ll be very happy. Keep us posted on your SSB adventure with TN0110. Tony - AC9QY toggle quoted message Show quoted text On Sun, Mar 23, 2025 at 11:15?PM mux_folder2001 via <canthony15=[email protected]> wrote: I have been running TN0110 finals and I calibrated my QMX+ with them. I wanted to see if the BS170 produced different curves so I installed BS170s and ran the calibration. When I was done, the finals were blown. I wonder whether or not Hans is using the shaping when he is keying the radio for the cal sweeps. The cal results didn't look substantially different from the TN0110 so I have gone back to the TN0110 and I am recalibrating. Tony AD0VC
mux_folder2001 All Messages By This Member #141635 开云体育 Thanks. The jury is still out for me since I have not managed to get good results with SSB yet. The microphone I tried worked but the audio was noisy and sounded distorted. I decided to order the electret that Hans is using to put one more stake in the ground before experimenting further. I think it may just be a matter of getting all the settings right. If I start with his mic, I stand a better chance at getting there. Tony AD0VC toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of Tony Scaminaci via groups.io <tonyscam@...> Sent: Monday, March 24, 2025 8:15 PM To: [email protected] <[email protected]> Subject: Re: [QRPLabs] SSB Calibration blown finals ? Hi Tony, It’s good to hear that the calibration using TN0110 was similar to that of the BS170. I was initially concerned about SSB performance but when Hans mentioned his calibration technique, I had one of those Ah-Ha moments with hopes for a good outcome. Thanks for running the calibration on both devices. Over the past year or so, it seems we came to an unofficial conclusion that BS170s were blowing due to high drain voltage as a result of high SWR or exceeding 12VDC at the supply input rather than overheating due to high current. TN0110 has a significantly higher drain voltage advantage over BS170 (100V vs 60V) and if it works well with SSB, I’ll be very happy. Keep us posted on your SSB adventure with TN0110. Tony - AC9QY On Sun, Mar 23, 2025 at 11:15?PM mux_folder2001 via <canthony15=[email protected]> wrote: I have been running TN0110 finals and I calibrated my QMX+ with them. I wanted to see if the BS170 produced different curves so I installed BS170s and ran the calibration. When I was done, the finals were blown. I wonder whether or not Hans is using the shaping when he is keying the radio for the cal sweeps. The cal results didn't look substantially different from the TN0110 so I have gone back to the TN0110 and I am recalibrating. Tony AD0VC
Jerry Gaffke All Messages By This Member #141637 Tony's, ? The fix Hans put into the SSB firmware to avoid blown finals? is to periodically give it a rest so the finals can cool down. If that does help (and my impression from forum reports is that it probably does), then current can also be a problem. ? Fortunately, the TN0110's can deal with both more voltage and more current than the BS170's. So if they can transmit clean SSB on the QMX, that's a big win either way. ? Jerry, KE7ER ? ? ? On Mon, Mar 24, 2025 at 07:15 PM, Tony Scaminaci wrote: toggle quoted message Show quoted text Over the past year or so, it seems we came to an unofficial conclusion that BS170s were blowing due to high drain voltage as a result of high SWR or exceeding 12VDC at the supply input rather than overheating due to high current. TN0110 has a significantly higher drain voltage advantage over BS170 (100V vs 60V) and if it works well with SSB, I’ll be very happy. Keep us posted on your SSB adventure with TN0110.

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