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Re: low power out on HF

DH1KLM
 

The IC7000 is known to develop issues with the driver and the finals also. Even in this group there are several posts about this topic. Otherwise Google is your friend.


Re: low power out on HF

Helmut Wabnig
 

On Tue, 19 Jan 2021 08:34:23 +0100, you wrote:

replaced maybe the driver transistor, is it common for this part to
go bad ?
Any thing to watch out for to prevent it from happening in the future
This is not the driver in question, it is common to HF and V / UHF.
To prevent this failure, do not use more than 30W in FM or numerical
mode (FT8, etc)
like all the 100W tranceivers.

Best regards,
Ludovic - F5PBG.
http://radioamateur.forumsactifs.com/f36-ic-7000

With the appropriate care, the 7000 is capable of working 100% power,
that is, 100 watts on HF , 50 w on VHF and 30 w on UHF,
in FT8 with its (the FT8) 50% duty cycle.
All those "don'ts" and "do nots" are based on unsufficient technical
knowledge.

As for the original poster's complaint, his 7000 does not deliver the
rated capacity power, yes, there is perhaps a hardware problem
and you will possibly have to replace the driver and/or the finals.
I cannot remotely diagnose the fault. Must have my hands on :-)

Sorry for being nasty, but those "don't do this" pull my nerves.

OE8UWW


Re: low power out on HF

Ludovic Ludo
 

replaced maybe the driver transistor, is it common for this part to go bad ?
Any thing to watch out for to prevent it from happening in the future

This is not the driver in question, it is common to HF and V / UHF.
To prevent this failure, do not use more than 30W in FM or numerical mode (FT8, etc)
like all the 100W tranceivers.

Best regards,
Ludovic - F5PBG.
http://radioamateur.forumsactifs.com/f36-ic-7000


low power out on HF

Jamie WW3S <ww3s@...>
 

Only getting about 25 watts out or so on HF, VHF/UHF is fine, full power.....Its NOT the power cord, I've tried a couple different ones, same result, and those cords work fine with my 7300, I had a problem with the 7000 before, actually no power out on HF and SARS in Michigan, replaced maybe the driver transistor, is it common for this part to go bad? Any thing to watch out for to prevent it from happening in the future. 


Re: VCTCXO model and the issue with crystal aging - 2LO off the DAC range

Steve W3AHL
 

Igor,

Good job!  Glad you were able to get the REF in spec with a simple change.

Steve, W3AHL


Re: VCTCXO model and the issue with crystal aging - 2LO off the DAC range

igor-m <mikki@...>
 

I applied my TCXO mod above and it seems it works!
I removed the R11 short and soldered in a 10k smd resistor at the pads of the not populated trimp pot.
The 10k resistor is easily accessible now as it sits on "top side" of the DDS pcb when mounted in.
I also covered the TCXO and the pcb from the opposite side with 3mm piece of foam (against the "banana effect").

The measurement is as follows now:

Service menu:
HEX        FREQ 2LO
00            124.031.190
7F            124.031.640
FF            124.032.120

I get the exact 2LO frequency of 124.032.000 Hz with E6 hex.

While measuring at the dummy load (with TX RTTY method) I get my 21.200.000 with 89% set in OTH menu #51.

73 Igor


Re: VCTCXO model and the issue with crystal aging - 2LO off the DAC range

igor-m <mikki@...>
 

Example: With R11 removed and the trimmpot soldered in (will be accessible from the top of the DDS board), for example 22k large, you may get following voltage ranges (the x-axis is the DAC output voltage from 00h to FFh, and the y-axis is the voltage at the CV pin of the TCXO):


Re: VCTCXO model and the issue with crystal aging - 2LO off the DAC range

igor-m <mikki@...>
 

On the DDS pcb - the position H10-V5 - you may find the pads for a smd pot trimmer (not populated), wired to the VC pin of the TCXO. They apparently planned to have a pot trim there in order to find a sweet spot for the voltage tuning range..


VCTCXO model and the issue with crystal aging - 2LO off the DAC range

igor-m <mikki@...>
 

Hi, as it has been discussed earlier I have been messing with the rather known potential issue - the TCXO's crystal aging.
The service menu REF hex value of FF does not tune my 2LO to the required 124.032MHz. Even with 100% OTH menu #51 I am still low by 5-10Hz at 21.2MHz.
I've made a model of the TCXO voltage tuning (based on the schematics in the Service Manual) and I've plotted the voltage range the 8bit DAC is producing at the TCXO's voltage control pin.The DAC is placed inside the HD64F2377 MCU.
It seems to me a potential solution could be a replacement of a resistor in the voltage divider - ie. the R10 with the stock value 22k (green) - after replaced by a larger value (ie. 27k, 33k) will shift the tuning voltage range such the TCXO will move higher with its frequency, imo.
Below the picture with the simulation.
PS: I would also increase the capacitor value there as the MCU's on-chip DACs are pretty noisy usually..
73 Igor


Re: IC7000 No power on, no relay click

Luc
 

Good evening to all..

finely i found the reason for no turning on of my 7000

R723 was broken..i measure 14v on the fuse site and only abbt 3v on the other side of the R.

so to low voltage on the regulator in the logic board...and no activation of q700 to pull the relais and give the HV line onn

Buth!!! the R has a value of 4.3ohm wen i measere him...silly!!

desolder him and he broke in 2 parts...so replaced bij a "ordinary" R and the 7000 is lighting and rx...

greeting


Re: LO off QRG

igor-m <mikki@...>
 

Steve, when you change the tuning voltage wired to the VCTCXO the TX frequency (measured with a counter at the dummy load) has to change too, imho. The 7000's firmware or hardware has not got any internal means how to determine "how much the frequency of the xtal has changed by applying certain voltage difference". There is none internal reference except the master VCTCXO oscillator.
Thus, when your external counter show 21.000.000 at the TX dummy load with "5F" hex, and you change it to "2C" you must see a change of the TX frequency after returning from the manufacturing menu. The important assumption is there is the "VC" TXCO module soldered on the board, the DAC works and the firmware has not got a bug as well.
Would be great if we will come to an understanding "how the stuff works", as this is a topic people here discussing for a decade already :)


Re: LO off QRG

Steve W3AHL
 

Igor,

There is much that goes on in the firmware that makes it hard to predict how the hardware will work.  But the behavior you see is normal.  Setting the REF frequency accurately will either solve your problem or tell you there is a problem with the oscillator or the control voltage from the CPU.

Your unit's hex value for REF of 9B is higher than typical in the four radios I have recorded the values for ((typically 55-76), but accurate measurement is the only way to set the frequency so that the IF stages work corrrectly.

Steve, W3AHL


Re: LO off QRG

igor-m <mikki@...>
 

On Sat, Jan 9, 2021 at 09:52 PM, Steve W3AHL wrote:

..
In Maintenance mode, adjusting the REF setting from 0-FF changes the 124.032 MHz 2LO by 1300 Hz, but does not affect the TX frequency when returned to normal mode -- just as you saw.
I don't have an explanation for why it behaves that way.  ..

I've asked Icom Europe on this (a week back), none answer yet.
My gut feeling tells me the change of the maintenance mode REF setting from 0-FF must change the TX frequency in AM CW RTTY modes, provided you do not touch the OTH #51.
If the the maintenance mode REF setting from 0-FF "really changes the control voltage of the VCTCXO" then your TX frequency must change accordingly.
No way it stays the same after the return to the normal mode..
Igor


Re: LO off QRG

igor-m <mikki@...>
 

@Steve and Helmut: thanks for the hints.
I started to doubt that I can see a change of the TX freq (while changing the hidden adjust hex value) after I had a look in the service manual - the "frequency scheme" picture there.
It could be the changing of the voltage (while changing the maintenance REF OSC hex value) changes the oscillator's frequency actually, but the TX frequency stays unaffected because the change "somehow cancels out" within the frequency scheme. It is not easy to formalize the change from that picture, though.
Hopefully, the setting the master frequency as described in the service manual will help with the aged crystal..
Igor


Re: LO off QRG

Helmut Wabnig
 

On Sat, 09 Jan 2021 12:52:18 -0800, you wrote:

Using my calibrated Agilent 8924C analyzer I see OTH #51 vary by 1330 Hz from 0-100% when measuring the 124.032 MHz 2LO signal at P4.  When transmitting on CW or AM at 20 MHz it varies 215 HZ from 0-100%.

In Maintenance mode, adjusting the REF setting from 0-FF changes the 124.032 MHz 2LO by 1300 Hz, but does not affect the TX frequency when returned to normal mode -- just as you saw.

I don't have an explanation for why it behaves that way.  But if you have accurate frequency measurement equipment and follow the adjustment procedures, you should have adequate adjustment range in menu #51 to calibrate your TX/RX signal at UHF and below.  You should verify that your DDS REF 2LO is at exactly 124.032 MHz.  Then perhaps verify your RX frequency in normal mode by zero beating to a commercial transmitter at the highest frequency possible.

It is possible for the X1 VCTCXO reference oscillator to drift with age, but that would only be suspect if can't adjust the 2LO REF signal to 124.032 MHz in Maintenance mode.

Steve, W3AHL
I once had a 700 with exactly this problem.
Cannot calibrate down, reaches 100 % in menu 51.

What I found is the analog control voltage to the oscillator chip VFO
was off and not in spec. Voltage coming from the CPU box.
The oscillator is at the lower side of the pcb, which made me angry.
:-)
Sold the radio as "defect".

If you have a chance to borrow another 7000,
swap the CPU box to find out what happens.

OE8UWW


Re: LO off QRG

Steve W3AHL
 

Using my calibrated Agilent 8924C analyzer I see OTH #51 vary by 1330 Hz from 0-100% when measuring the 124.032 MHz 2LO signal at P4.  When transmitting on CW or AM at 20 MHz it varies 215 HZ from 0-100%.

In Maintenance mode, adjusting the REF setting from 0-FF changes the 124.032 MHz 2LO by 1300 Hz, but does not affect the TX frequency when returned to normal mode -- just as you saw.

I don't have an explanation for why it behaves that way.  But if you have accurate frequency measurement equipment and follow the adjustment procedures, you should have adequate adjustment range in menu #51 to calibrate your TX/RX signal at UHF and below.  You should verify that your DDS REF 2LO is at exactly 124.032 MHz.  Then perhaps verify your RX frequency in normal mode by zero beating to a commercial transmitter at the highest frequency possible.

It is possible for the X1 VCTCXO reference oscillator to drift with age, but that would only be suspect if can't adjust the 2LO REF signal to 124.032 MHz in Maintenance mode.  

Steve, W3AHL


Re: LO off QRG

igor-m <mikki@...>
 

Corrected: "With the OTH menu #51 I get about 150Hz diff from 0-100% (at 20MHz).


Re: LO off QRG

igor-m <mikki@...>
 

Hi, the same issue here. EU version, 13y old 7k.
With the OTH menu #51 I get about 4.5kHz diff from 0-100%.
"Luckily" at the 100% setting it is only 5Hz low (at around 20MHz).
While messing with the REF OSC adjust menu (stock hex 9B here) I see none influence on the TX frequency (and yes, I press SET).
I've been measuring the frequency at a dummy load while TXing in AM or RTTY mode.
I would be happy to know for what is the "hex adjust" menu actually good for.
My current understanding is that while changing the hex value I must see a change in the TX frequency..
Any hint plz?


Re: IC7000 with ACLog

Jeff Freedman
 

Please re-read the question. Slightly different application, where two data ports may be involved.


Re: IC7000 with ACLog

Robie - AJ4F
 

Jeff,

This is discussed in the ACLog documentation:


Robie - AJ4F



On Fri, Jan 8, 2021 at 9:17 AM Jeff Freedman <jeffk7jf@...> wrote:
Using the 7000 with ACLog. Connected data port on rig to laptop with RigRunner. Works great to capture the frequency. How do I connect the rig to the laptop for ACLog to transmit CW please? Thanks!

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