You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Update - Found crystal socket on the xtra channel board loose, reflowed. Checked TA7222P AF output - voltages were bad. Replaced and now have audio. Still have an issue with voltage at pin#2 manual states 3v but my reading is 6.63v. Pin#5 & 6 states 1.8v my readings are 1.15v on each. Didn't know if that .6v will make a difference somewhere. I now have TX modulation also. It had very minimal output power - checked the voltages TR#41 was 13.8 on the collector in receive then in TX dropped to 0. Moved on to TR#40 0v collector in RX and 1.4v in transmit manual states 7.6v. TR#39 13.2v collector RX and 3.7v TX manual states 5v. While checking these the collector voltages then started working on TR#39 & 41 and then I had output wattage so I checked for cold/bad solder joints didn't see anything so I just reflowed. Still only 1.4v on TR40 in TX. It worked fine for a few hours and when I started the two tone into the mic I lost output power again. Checked and the voltages were gone again just on the collector TX. While checking them again I again have the 5v back but very minimal output power. 1/2w AM 1w pep SSB. I thought I would check the Bias and I have no BIAS current and nothing when I go to adjust at TP8 & 7 just sits at 0. I have replaced capacitors 191,215,162 in the BIAS section still no difference. I have removed TR41,40,39 and 34 on tester - tested ok. Any help would be greatly appreciated. Im getting close just need some more direction.

<blockquote data-quote="RichardHartman" data-source="post: 751016" data-attributes="member: 54277"><p>Update - Found crystal socket on the xtra channel board loose, reflowed. Checked TA7222P AF output - voltages were bad. Replaced and now have audio. Still have an issue with voltage at pin#2 manual states 3v but my reading is 6.63v. Pin#5 &amp; 6 states 1.8v my readings are 1.15v on each. Didn&#039;t know if that .6v will make a difference somewhere. I now have TX modulation also. It had very minimal output power - checked the voltages TR#41 was 13.8 on the collector in receive then in TX dropped to 0. Moved on to TR#40 0v collector in RX and 1.4v in transmit manual states 7.6v. TR#39 13.2v collector RX and 3.7v TX manual states 5v. While checking these the collector voltages then started working on TR#39 &amp; 41 and then I had output wattage so I checked for cold/bad solder joints didn&#039;t see anything so I just reflowed. Still only 1.4v on TR40 in TX. It worked fine for a few hours and when I started the two tone into the mic I lost output power again. Checked and the voltages were gone again just on the collector TX. While checking them again I again have the 5v back but very minimal output power. 1/2w AM 1w pep SSB. I thought I would check the Bias and I have no BIAS current and nothing when I go to adjust at TP8 &amp; 7 just sits at 0. I have replaced capacitors 191,215,162 in the BIAS section still no difference. I have removed TR41,40,39 and 34 on tester - tested ok.&nbsp; Any help would be greatly appreciated. Im getting close just need some more direction.</p></blockquote><p></p>

[QUOTE="RichardHartman, post: 751016, member: 54277"] Update - Found crystal socket on the xtra channel board loose, reflowed. Checked TA7222P AF output - voltages were bad. Replaced and now have audio. Still have an issue with voltage at pin#2 manual states 3v but my reading is 6.63v. Pin#5 & 6 states 1.8v my readings are 1.15v on each. Didn't know if that .6v will make a difference somewhere. I now have TX modulation also. It had very minimal output power - checked the voltages TR#41 was 13.8 on the collector in receive then in TX dropped to 0. Moved on to TR#40 0v collector in RX and 1.4v in transmit manual states 7.6v. TR#39 13.2v collector RX and 3.7v TX manual states 5v. While checking these the collector voltages then started working on TR#39 & 41 and then I had output wattage so I checked for cold/bad solder joints didn't see anything so I just reflowed. Still only 1.4v on TR40 in TX. It worked fine for a few hours and when I started the two tone into the mic I lost output power again. Checked and the voltages were gone again just on the collector TX. While checking them again I again have the 5v back but very minimal output power. 1/2w AM 1w pep SSB. I thought I would check the Bias and I have no BIAS current and nothing when I go to adjust at TP8 & 7 just sits at 0. I have replaced capacitors 191,215,162 in the BIAS section still no difference. I have removed TR41,40,39 and 34 on tester - tested ok. Any help would be greatly appreciated. Im getting close just need some more direction. [/QUOTE]

Top Bottom