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Re: Hf tx
Ok I will do that. Thanks Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Saturday, February 1, 2025 3:47:49 PM To: [email protected] <[email protected]> Subject:
By James Weston · #42930 ·
Re: Hf tx
James, Before you do anything, make sure the power supply can handle the transmit current of the rig. If it did it before, it’s probably fine. And definitely, take out the blade fuses from
By James F. Boehner, MD · #42929 ·
Re: Hf tx
Check the absorption of the power supply, check the contacts of the cable with the power supply and with the radio and finally check the fuses along the cable itself, they must have a solid electrical
By Pasquale S · #42928 ·
Hf tx
I've owned my 7000 since new. Recently upon attempting to TX on hf the radio re-starts. Any ideas before I send it off? Tried different antennas same result. Haven't tried vhf or uhf.
By James Weston · #42927 ·
Re: IC7000 no HF Transmit
I have done a little more troubleshooting around the LPF final filter section. I unplugged the cable from the main board to the PA. I set the freq to 14.2 MHz. I separated the output of L305
By Tommy Wooten · #42926 ·
Re: IC7000 no HF Transmit
20% high does not sound too bad!! It is when they drop low and you lose 90% will be the issue. 73 Andrew ?Get BlueMail for Android ?
By Andrew Lenton · #42925 ·
Re: IC7000 no HF Transmit
JD I think Andrew suggested that capacitors may be the issue. There are two large smt capacitors in the filter section after the PA section. I removed these and measured them. The result is as
By Tommy Wooten · #42924 ·
Re: IC7000 no HF Transmit
Steve Great info. I will consider these measurements, especially the ALC section. Thanks Tommy [email protected]> wrote:
By Tommy Wooten · #42923 ·
Re: Adjusting
Thank you for this update, Pentti OH5KOA. This is great news!? ?It was a difficult repair in many ways, and you did very well to find the parts.
By Steve G4ALG · #42922 ·
Re: IC7000 no HF Transmit
Tommy, This file in the Group's Files section shows RF levels at key points from the IF output to the Antenna output.? Typical ALC levels are also shown at the
By Steve W3AHL · #42921 ·
Re: Adjusting
Update, the coil cans I ordered have arrived and have also been installed. High-quality and functional parts, which I did wait a little while for. The radio now works great. I can recommend the
By OH5KOA · #42920 ·
Re: IC7000 no HF Transmit
RL801 may not be making good contact. You can check the levels with your scope. I would use SSB and whistle in the Mike for tracing to keep the power dissipation low. [email protected]> wrote:
By J.D. Barron · #42919 ·
Re: IC7000 no HF Transmit
Take a good look at RL801 [email protected]> wrote:
By J.D. Barron · #42918 ·
Re: IC7000 no HF Transmit
JD I was able to access each of the relay leads from the top side of the PA board. I found that each relay had the 14VR supplied at the relay coil. The voltage is 10.5V and falls to 9.2V when tx is
By Tommy Wooten · #42917 ·
Re: IC7000 no HF Transmit
Very well said, Tommy has removed the PA transformer and resolder it top side, but he was still only getting low power, so does not make much sense KR Andrew ?Get BlueMail for Android ?
By Andrew Lenton · #42916 ·
Re: IC7000 no HF Transmit
(PA 1) The RF comes from L305? through HF03 to RL-801 (PA 2) (changes from orange to blue and out through (A). to (PA 3) the bandpass filters. There are a pair of relays that have to be energized for
By J.D. Barron · #42915 ·
Re: IC7000 no HF Transmit
Ok it is a cap, I had this, a 390nf cap measured 50 of, and did attenuated lower frequencies. Change a few caps ?Get BlueMail for Android ?
By Andrew Lenton · #42914 ·
Re: IC7000 no HF Transmit
Hi Tommy Have you tried removing J101, drive to hf PA. You can then put the radio into TX mode and check continuity of circuit after C327. You should be able to check circuit through the relay and
By James Tiberius · #42913 ·
Re: IC7000 no HF Transmit
JD, Thank you for the insight. I appreciate the response. I agree with your comment that there may some kind of fault past the L305 transformer. I have looked for broken traces in the path through
By Tommy Wooten · #42912 ·
Re: IC7000 no HF Transmit
Hi There is an path problem broken track or inductors or SC caps. You need to to feed a DC in reflected path to drop the power to a few watts current no more than 3 amps, then signal
By Andrew Lenton · #42911 ·