Date   

Re: High SWR on all HF Bands

Steve W3AHL
 

With a pure resistive 50 ohm dummy load the impedance seen at the SWR meter or radio will not change significantly with different lengths of coax, assuming the coax is close to 50 ohm Z.  

It will change when the  load impedance is different than the coax.    Of course many 50 ohm loads are not really 50 ohms at RF, even if an multimeter says they are OK.  If the 259B measures the dummy load as 50 ohms non-reactive, then it is probably OK.

Steve, W3AHL


Re: High SWR on all HF Bands

Max
 

I've connected the dummy load directly to the radio. I still have a 2:1 to 3:1 depending on band. I'm gonna have to send it out for repairs.

Max KG4PID

On Wednesday, October 28, 2020, 03:01:38 PM CDT, J.D. Barron <jeter.d.barron@...> wrote:


You evidently have at least two patch cables and the one from the SWR meter to the dummy load must be good. Try hooking the IC-7000 directly to the dummy load using that cable. Then for the heck of it try the other one too.


Re: High SWR on all HF Bands

 

You evidently have at least two patch cables and the one from the SWR meter to the dummy load must be good. Try hooking the IC-7000 directly to the dummy load using that cable. Then for the heck of it try the other one too.


Re: High SWR on all HF Bands

Dallas N4DDM
 

Max,
I agree with the other folks that suggest you swap out your SWR meter, jumpers, and dummy load from those of a nearby ham...  

Prove beyond a shadow of drought that your radio has a problem and not your jumper, SWR meter, or dummy load...

Case in point:
I have an SWR meter from my CB days and it works OK at 2m to give me a ballpark test of SWR...  It is NOT accurate as my Bird Wattmeter but it's easy to use, if I drop it, who cares...  If it says the SWR is low, it's low...  If it says the SWR is high, it's high...  If I ask for an audio test on the local repeater it sounds like I'm holding an electric shaver next to the microphone...  It took a while to figure out what was going on...  To find the problem you have to swap things out 1 at a time...


73 Dallas, KD4HNX
Whatever you do, don’t fall victim to “paralysis by
analysis.” Go ahead and buy/build one and start 
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!


On Wednesday, October 28, 2020, 02:33:13 PM EDT, Max via groups.io <kg4pid@...> wrote:


Good to know that the parts are available. Hopefully that will help reduce the repair costs.

Max KG4PID

On Wednesday, October 28, 2020, 05:12:35 AM CDT, Dallas KD4HNX via groups.io <mylastname@...> wrote:


Max,
If you have ever looked in an SWR meter there are only a handful of components to go bad...

I've attached the SWR ckt of the IC-7000 from the service manual (you can find this on-line in pdf format)...

I was able to find the diodes and the opamp on the internet...  I even found them on ebay...






73 Dallas, KD4HNX
Whatever you do, don’t fall victim to “paralysis by
analysis.” Go ahead and buy/build one and start 
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!


On Tuesday, October 27, 2020, 09:13:36 PM EDT, Max via groups.io <kg4pid@...> wrote:


Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID


Re: High SWR on all HF Bands

Max
 

The external meter was always in the circuit but has been checked with my 259B. In fact everything has been checked, from all my coax jumpers, both dummy loads and my other power/swr meters. 

Since my eyesight is failing and I have no SMD rework equipment I'll be forced to send it out for repair. Any suggestions on who to send it to?

Thanks, Max KG4PID 

On Wednesday, October 28, 2020, 06:00:10 AM CDT, Dennis Klipa <klipadk@...> wrote:


That is a curious problem and I look forward to hearing the resolution. 

I tend to agree with William.  SWR is independent of where you measure it along a length of coax.  There are two exceptions to this rule.  One is when the coax is very lossy and power is consumed in the line during the trip to the antenna and back resulting in less reflected power and an apparently better SWR and antenna match than is reality.  I once used some new Radio Shack RG58 to connect to a 2 meter vertical.  I had a perfect 1:1 SWR.  The only problem was that no rf was actually making it to the antenna and so nothing was reflected!  The second exception is when you have rf voltage on the outside of the coax.  In that case the SWR reading will vary with position along the coax, but you are not reading true SWR.  This situation usually arises with unbalanced antennas or systems.  As William suggested, common mode chokes can rectify that problem.  

I do have a question.  Do you always have the external power/SWR meter in the line or was it there just to explore the problem?  Does the problem exist without the external meter?  If it is always in-line it could be the source of the imbalance.  Does the IC7K SWR reading change if you replace the external meter with a barrel connector?

If you don't have rf on the shield of the coax, and assuming that a defective part in the IC7K has caused a calibration issue of the SWR meter, I would not expect to see the SWR vary with coax length.  But, I have been wrong before.

Happy hunting!

Best Regards,
Dennis, N8ERF

On Wed, Oct 28, 2020, 2:04 AM William Kerker <km0f@...> wrote:
I'm wondering if you need a common mode choke on the coax. Sounds like RF on the coax. 

On Tue, Oct 27, 2020 at 8:13 PM Max via groups.io <kg4pid=yahoo.com@groups.io> wrote:
Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID



--
Bill,  KMØF

Radio Amateurs must be tough, it's a 'Contact Sport'


Re: High SWR on all HF Bands

Max
 

Good to know that the parts are available. Hopefully that will help reduce the repair costs.

Max KG4PID

On Wednesday, October 28, 2020, 05:12:35 AM CDT, Dallas KD4HNX via groups.io <mylastname@...> wrote:


Max,
If you have ever looked in an SWR meter there are only a handful of components to go bad...

I've attached the SWR ckt of the IC-7000 from the service manual (you can find this on-line in pdf format)...

I was able to find the diodes and the opamp on the internet...  I even found them on ebay...






73 Dallas, KD4HNX
Whatever you do, don’t fall victim to “paralysis by
analysis.” Go ahead and buy/build one and start 
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!


On Tuesday, October 27, 2020, 09:13:36 PM EDT, Max via groups.io <kg4pid@...> wrote:


Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID


Re: High SWR on all HF Bands

Max
 

From the radio straight to a dummy load. I hope not. The dummy load checked good on my 259B.

Max KG4PID

On Wednesday, October 28, 2020, 01:04:16 AM CDT, William Kerker <km0f@...> wrote:


I'm wondering if you need a common mode choke on the coax. Sounds like RF on the coax. 

On Tue, Oct 27, 2020 at 8:13 PM Max via groups.io <kg4pid=yahoo.com@groups.io> wrote:
Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID



--
Bill,  KMØF

Radio Amateurs must be tough, it's a 'Contact Sport'


Re: High SWR on all HF Bands

don ---------
 

So   a  Swr isssue caused by  the  suspect length of  coax
will change how it responds on diffrent bands.

so if with a dummy load on the end of coax  line 

What is the  SWR on  diffrent bands ?

Ka7qqv
Ka7qqv@...

On 10/28/2020 5:58 AM Steve W3AHL <w3ahl@...> wrote:


Dennis,

The length of coax will affect the SWR seen at the radio.  Using a simple program like Transmission Lines for Windows, supplied with the ARRL Antenna Book, will show how much it varies.  Transmission lines are often used for matching purposes in antenna designs for single band antennas.  A quarter wave (electrical length) transmission line is an impedance inverter and can dramatically change the measured SWR, compared to a half wave line.  

But an unbalanced antenna with no common mode choke at the feed point will also exhibit the same behavior, along with distorted audio or other problems due to high RF in the shack.

Steve, W3AHL


Re: High SWR on all HF Bands

Steve W3AHL
 

Dennis,

The length of coax will affect the SWR seen at the radio.  Using a simple program like Transmission Lines for Windows, supplied with the ARRL Antenna Book, will show how much it varies.  Transmission lines are often used for matching purposes in antenna designs for single band antennas.  A quarter wave (electrical length) transmission line is an impedance inverter and can dramatically change the measured SWR, compared to a half wave line.  

But an unbalanced antenna with no common mode choke at the feed point will also exhibit the same behavior, along with distorted audio or other problems due to high RF in the shack.

Steve, W3AHL


Re: 7000 but never used , getting it going

Steve W3AHL
 

I have used my 7K in a Ford C-Max Hybrid that also stops and starts the engine frequently and had no problems.  The 7K, like most radios that use a CPU, has a low-voltage detector that prevents the CPU from running until the voltage is stable by asserting the RESET signal.  In the 7K this occurs around 8.8 VDC.  

You should investigate why the voltage is dropping so low.  The battery may be nearing end of life, the poor quality fuse holders on the 7k's power cable should be replaced with good quality ATC syle rated for 30 amps (10 awg pig tails leads) or you may have poor connections somewhere in the power wiring to the battery or to the radio.  Measuring the voltage at the radio during the engine start cycle with a digital scope will probably show a short dip in the voltage level below 9 VDC.  

DC-DC converters often are a source of RFI for HF radios and also may not have adequate voltage regulation  under a wide dynamic load, introducing distortion or spurious emmisions in the RF signal.  A small auxilliary battery (7AH will usually be adequate) located near the radio is often a better solution.  A low voltage drop Schottky diode should be used in series with the battery to prevent it from supplying power to the rest of the car.  

Steve, W3AHL


Re: High SWR on all HF Bands

WA8Y Steven
 

Can you test with different coax?

If not, at least do a visual inspection of the shield to PL-259 connection at each end.   lf the shield has come lose, or the connection is oxidized,  that could cause your problem.

Steven  WA8Y


Re: High SWR on all HF Bands

Dennis Klipa
 

That is a curious problem and I look forward to hearing the resolution. 

I tend to agree with William.  SWR is independent of where you measure it along a length of coax.  There are two exceptions to this rule.  One is when the coax is very lossy and power is consumed in the line during the trip to the antenna and back resulting in less reflected power and an apparently better SWR and antenna match than is reality.  I once used some new Radio Shack RG58 to connect to a 2 meter vertical.  I had a perfect 1:1 SWR.  The only problem was that no rf was actually making it to the antenna and so nothing was reflected!  The second exception is when you have rf voltage on the outside of the coax.  In that case the SWR reading will vary with position along the coax, but you are not reading true SWR.  This situation usually arises with unbalanced antennas or systems.  As William suggested, common mode chokes can rectify that problem.  

I do have a question.  Do you always have the external power/SWR meter in the line or was it there just to explore the problem?  Does the problem exist without the external meter?  If it is always in-line it could be the source of the imbalance.  Does the IC7K SWR reading change if you replace the external meter with a barrel connector?

If you don't have rf on the shield of the coax, and assuming that a defective part in the IC7K has caused a calibration issue of the SWR meter, I would not expect to see the SWR vary with coax length.  But, I have been wrong before.

Happy hunting!

Best Regards,
Dennis, N8ERF


On Wed, Oct 28, 2020, 2:04 AM William Kerker <km0f@...> wrote:
I'm wondering if you need a common mode choke on the coax. Sounds like RF on the coax. 

On Tue, Oct 27, 2020 at 8:13 PM Max via groups.io <kg4pid=yahoo.com@groups.io> wrote:
Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID



--
Bill,  KMØF

Radio Amateurs must be tough, it's a 'Contact Sport'


Re: High SWR on all HF Bands

 

Spot on on the forward and reverse power signals. Get you a known good piece of coax and use the dummy load to make sure that the coax is good. I check them with the antenna allayer I have as well.
After you have made certain that your coax and dummy loar are good and 50 ohms (use a good ohmmeter too) they you can check not the swr, which is a derived signal in the CPU, but the forward and reverse power readings. With a 1:1 swr the numbers should tell the tale. Forward power should be some value (I forger wha) and reverse should be close to zero (0).
These signals go to the ALC circuit to control power output and drive to the finals. I have had problems in the ALC circuit as well as in the JHREF and JH FOR. The JHFOR is used to regulate the power output and when compared to the JHREF reduce the power to protect the finals as well. 
Somewhere here I have posted the relevant sections of the schematic for the ALC circuit.


Re: High SWR on all HF Bands

Dallas N4DDM
 

Max,
If you have ever looked in an SWR meter there are only a handful of components to go bad...

I've attached the SWR ckt of the IC-7000 from the service manual (you can find this on-line in pdf format)...

I was able to find the diodes and the opamp on the internet...  I even found them on ebay...






73 Dallas, KD4HNX
Whatever you do, don’t fall victim to “paralysis by
analysis.” Go ahead and buy/build one and start 
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!


On Tuesday, October 27, 2020, 09:13:36 PM EDT, Max via groups.io <kg4pid@...> wrote:


Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID


Re: 7000 but never used , getting it going

Max White
 

Does your vehicle have the option to disengage the 'eco stop' to avoid this issue? My Freelander 2 does. 

De Max/M0VNG



From: ic7000@groups.io <ic7000@groups.io> on behalf of Mike Binder <na6mb.info@...>
Sent: 28 October 2020 00:07
To: ic7000@groups.io <ic7000@groups.io>
Subject: Re: [ic7000] 7000 but never used , getting it going
 
I totally agree with this !

I ran my IC-7000 mobile last summer on a 4400+ mile road trip.

It was installed in a 2019 Toyota Highlander that stops the engine when you are stopped at a light etc. (to save gas) and restarts when you let off the brake.
Without my battery booster the IC-7000 "rebooted" every time. Works just fine with the booster in line.

My booster was less than $30 on eBay.   
https://www.ebay.com/itm/NEW-1500W-30A-DC-Converter-Boost-Power-Supply-Module-10-60V-12v-Step-up-12-90V/201621692626?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

The IC-7000 and on my old IC-706 are both quite voltage sensitive.
It is a good idea to switch off the booster if not used for a while, but it only draws 25-35 ma and the radio draws 10x that for receive.
That said, a friend rigged up a relay to kick in a booster on Tx and off (after a short delay)  on Rx.

Mike
NA6MB



On 10/25/2020 4:27 AM, Dallas KD4HNX via groups.io wrote:
Dave,
I don't remember you saying what kind of boat or what your power (battery capacity) is...

If you are using this in a sailboat and don't run the engine or generator while you operate the radio you have to watch for things that drain your battery, like a fan that stays on all the time...

Also, when the voltage on the battery drops down to 10 volts or so or the losses due to long battery leads, poor fuse holders, etc add up the radio craps out...  Consider getting a Battery Voltage Booster that takes 8-12VDC and boost it to 13.8VDC...

Also, this radio uses what is called "soft on" meaning a small part of the radio is on draining your battery all the time...  Consider a mechanical ON/OFF switch...

Make sure you have an ON/OFF switch to the Battery Voltage Booster so it doesn't drain your battery...




73 Dallas, KD4HNX
Whatever you do, don’t fall victim to “paralysis by
analysis.” Go ahead and buy/build one and start 
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!


On Sunday, October 25, 2020, 04:57:51 AM EDT, Pedro S - EA3FNM <pedro.segurar@...> wrote:


Hi Dave,
The improvments you can do are:
* Permanent fan running. to avoid increase of temperature
* Improvement at the microphone for better audio
* Fuse contact problem
* The most important, the first units had problems with the driver unit. Icom has one Service Note about how to solve this problem
* Open rx/tx band

About all their you can find information and also the SN at internet. Mods.dk

http://n6ha.blogspot.com/2011/11/ic-7000-driver-board-replacement-how-to.html


Re: 7000 but never used , getting it going

David's Gmail
 

I need a buck boost “ booster “ because at times the solar array will have the batteries at 14.4 or even a bit more 

so a simple boost only converter is going to run out of operating headroom imho 

dave 


Re: High SWR on all HF Bands

William Kerker
 

I'm wondering if you need a common mode choke on the coax. Sounds like RF on the coax. 

On Tue, Oct 27, 2020 at 8:13 PM Max via groups.io <kg4pid=yahoo.com@groups.io> wrote:
Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID



--
Bill,  KMØF

Radio Amateurs must be tough, it's a 'Contact Sport'


Re: 7000 but never used , getting it going

Brent Hawks
 

Looks like the N8XJK booster is making a comeback:
http://www.westmountainradio.com/product_info.php?products_id=battery-boost&navcode=/fpBoost

Bought a used 20amp unit nearly a decade ago, then purchased and modified with the thermal switch kit from TG Electronics, giving it a 40amp capacity.
Nothing to compare it to, and only relatively light use, but it's done me no wrong thus far.

-Brent, KG6KPD
     ~~~ ~~~ ~ ~ ~   ~ ~ ~ ~~~  ~~~


On Tue, Oct 27, 2020 at 7:12 PM Mark Schoonover via groups.io <mark=ka6wke.net@groups.io> wrote:
This booster looks interesting but it can only use a fixed input voltage. As the battery is being drained the terminal voltage will decrease and so will the output of the booster. I guess you could manually compensate for this drop but the MFJ unit can automatically compensate. Of course the latter is ten times the cost! 

On Tue, Oct 27, 2020, 17:07 Mike Binder <na6mb.info@...> wrote:
I totally agree with this !

I ran my IC-7000 mobile last summer on a 4400+ mile road trip.

It was installed in a 2019 Toyota Highlander that stops the engine when you are stopped at a light etc. (to save gas) and restarts when you let off the brake.
Without my battery booster the IC-7000 "rebooted" every time. Works just fine with the booster in line.

My booster was less than $30 on eBay.   
https://www.ebay.com/itm/NEW-1500W-30A-DC-Converter-Boost-Power-Supply-Module-10-60V-12v-Step-up-12-90V/201621692626?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

The IC-7000 and on my old IC-706 are both quite voltage sensitive.
It is a good idea to switch off the booster if not used for a while, but it only draws 25-35 ma and the radio draws 10x that for receive.
That said, a friend rigged up a relay to kick in a booster on Tx and off (after a short delay)  on Rx.

Mike
NA6MB



On 10/25/2020 4:27 AM, Dallas KD4HNX via groups.io wrote:
Dave,
I don't remember you saying what kind of boat or what your power (battery capacity) is...

If you are using this in a sailboat and don't run the engine or generator while you operate the radio you have to watch for things that drain your battery, like a fan that stays on all the time...

Also, when the voltage on the battery drops down to 10 volts or so or the losses due to long battery leads, poor fuse holders, etc add up the radio craps out...  Consider getting a Battery Voltage Booster that takes 8-12VDC and boost it to 13.8VDC...

Also, this radio uses what is called "soft on" meaning a small part of the radio is on draining your battery all the time...  Consider a mechanical ON/OFF switch...

Make sure you have an ON/OFF switch to the Battery Voltage Booster so it doesn't drain your battery...




73 Dallas, KD4HNX
Whatever you do, don’t fall victim to “paralysis by
analysis.” Go ahead and buy/build one and start 
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!


On Sunday, October 25, 2020, 04:57:51 AM EDT, Pedro S - EA3FNM <pedro.segurar@...> wrote:


Hi Dave,
The improvments you can do are:
* Permanent fan running. to avoid increase of temperature
* Improvement at the microphone for better audio
* Fuse contact problem
* The most important, the first units had problems with the driver unit. Icom has one Service Note about how to solve this problem
* Open rx/tx band

About all their you can find information and also the SN at internet. Mods.dk

http://n6ha.blogspot.com/2011/11/ic-7000-driver-board-replacement-how-to.html


Re: 7000 but never used , getting it going

Mark Schoonover
 

This booster looks interesting but it can only use a fixed input voltage. As the battery is being drained the terminal voltage will decrease and so will the output of the booster. I guess you could manually compensate for this drop but the MFJ unit can automatically compensate. Of course the latter is ten times the cost! 


On Tue, Oct 27, 2020, 17:07 Mike Binder <na6mb.info@...> wrote:
I totally agree with this !

I ran my IC-7000 mobile last summer on a 4400+ mile road trip.

It was installed in a 2019 Toyota Highlander that stops the engine when you are stopped at a light etc. (to save gas) and restarts when you let off the brake.
Without my battery booster the IC-7000 "rebooted" every time. Works just fine with the booster in line.

My booster was less than $30 on eBay.   
https://www.ebay.com/itm/NEW-1500W-30A-DC-Converter-Boost-Power-Supply-Module-10-60V-12v-Step-up-12-90V/201621692626?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

The IC-7000 and on my old IC-706 are both quite voltage sensitive.
It is a good idea to switch off the booster if not used for a while, but it only draws 25-35 ma and the radio draws 10x that for receive.
That said, a friend rigged up a relay to kick in a booster on Tx and off (after a short delay)  on Rx.

Mike
NA6MB



On 10/25/2020 4:27 AM, Dallas KD4HNX via groups.io wrote:
Dave,
I don't remember you saying what kind of boat or what your power (battery capacity) is...

If you are using this in a sailboat and don't run the engine or generator while you operate the radio you have to watch for things that drain your battery, like a fan that stays on all the time...

Also, when the voltage on the battery drops down to 10 volts or so or the losses due to long battery leads, poor fuse holders, etc add up the radio craps out...  Consider getting a Battery Voltage Booster that takes 8-12VDC and boost it to 13.8VDC...

Also, this radio uses what is called "soft on" meaning a small part of the radio is on draining your battery all the time...  Consider a mechanical ON/OFF switch...

Make sure you have an ON/OFF switch to the Battery Voltage Booster so it doesn't drain your battery...




73 Dallas, KD4HNX
Whatever you do, don’t fall victim to “paralysis by
analysis.” Go ahead and buy/build one and start 
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!


On Sunday, October 25, 2020, 04:57:51 AM EDT, Pedro S - EA3FNM <pedro.segurar@...> wrote:


Hi Dave,
The improvments you can do are:
* Permanent fan running. to avoid increase of temperature
* Improvement at the microphone for better audio
* Fuse contact problem
* The most important, the first units had problems with the driver unit. Icom has one Service Note about how to solve this problem
* Open rx/tx band

About all their you can find information and also the SN at internet. Mods.dk

http://n6ha.blogspot.com/2011/11/ic-7000-driver-board-replacement-how-to.html


High SWR on all HF Bands

Max
 

Hello everyone. I have an Icom 7000 that now shows a high SWR (2:1 - 3:1) depending on band into a dummy load (2 different ones). Here's the catch, I can change the SWR by using different lengths of coax between the radio and my external power/SWR meter. My external meter shows my dummy loads to be a good match but the radio doesn't agree. For a few months now I've had to use a 25Ft RG-58 jumper just to keep the SWR around 2:1 on the radio.

Is this just some failed part in the SWR detection circuitry or do I have bigger problems. I know its just guessing but what are the chances of it being an easy repair and are the parts available?

I'd hate to send it in just to be told the parts are unobtainium.

Max KG4PID

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