Date   

Re: Strength of the IC7000

 

HF to the outside, VHF to the inside. Probably better to color code the antenna leads maybe with inside VHF - outside HF


On Mon, Jun 1, 2020 at 8:28 AM Bob Hoffmann, K4CQO <rjhoffmann@...> wrote:
OK, I have to eat crow here, but wanted to saw how tolerant the IC7000 is and how well the MAT-TUNER mat-180H works. 

I do have the HF and VHF antennas labeled -- including the connectors and the coax, but after unplugging them for a lightening storm and reconnecting them, I manager to switch the whip that I use for VHF and Ultimax antenna that I use for HF. That went on for weeks -- actually do not remember how long it was switched.

I was wondering why the connection to the repeater was not going too well, and when I connected the HT for the DMR net and I could hear the connection very well, but when connecting to the repeater, I had lots of packet loss. The antenna tuner was able to get SWR to 1.5 for all of the bands -- including 160m -- while I was to the dual band 2m / 70 cm whip. I was surprised that I was able to get out at all!

Anyway, the IC7000 is doing fine, and now the S-meter is doing a lot better job of showing signals on HF than it was when connected to the dual band whip. I think that I need to put in a color coded label ... but I can say that the IC7000 and the antenna tuner are able to handle antennas that are no where near to the advertised bands without any apparent damage. I do have the power output set at 75-80%, but did put it up to 100% for the 2m net in order to be heard. I guess it makes sense to use the woodworking saying: "measure twice, cut once" for antenna connections -- the SWR of the units cannot be used to let you know if the right antenna is connected.



--
J.D. Barron


Strength of the IC7000

Bob Hoffmann, K4CQO
 

OK, I have to eat crow here, but wanted to saw how tolerant the IC7000 is and how well the MAT-TUNER mat-180H works. 

I do have the HF and VHF antennas labeled -- including the connectors and the coax, but after unplugging them for a lightening storm and reconnecting them, I manager to switch the whip that I use for VHF and Ultimax antenna that I use for HF. That went on for weeks -- actually do not remember how long it was switched.

I was wondering why the connection to the repeater was not going too well, and when I connected the HT for the DMR net and I could hear the connection very well, but when connecting to the repeater, I had lots of packet loss. The antenna tuner was able to get SWR to 1.5 for all of the bands -- including 160m -- while I was to the dual band 2m / 70 cm whip. I was surprised that I was able to get out at all!

Anyway, the IC7000 is doing fine, and now the S-meter is doing a lot better job of showing signals on HF than it was when connected to the dual band whip. I think that I need to put in a color coded label ... but I can say that the IC7000 and the antenna tuner are able to handle antennas that are no where near to the advertised bands without any apparent damage. I do have the power output set at 75-80%, but did put it up to 100% for the 2m net in order to be heard. I guess it makes sense to use the woodworking saying: "measure twice, cut once" for antenna connections -- the SWR of the units cannot be used to let you know if the right antenna is connected.


Rail mounts for IC-7000

George Kokolakis, SV3QUP
 

Hello to all,
I designed a pair of rails for my IC-7000 which can be either 3d printed or cut out of metal using a CNC. I have uploaded the desing to thingiverse here:https://www.thingiverse.com/thing:4405251.

73, SV3QUP George


Re: Seen these Auto ATU's

ronald keller
 






On Monday, May 25, 2020, 2:04 PM, montanaaardvark <boblombardi@...> wrote:

(I think I just hit a wrong button and got dumped - sorry if this is a dupe)

Do those "ATU-100 mini tuners by N7DDC" have a claimed impedance range?  You know, like the Icoms that have them have always claimed 3:1 VSWR.

I looked at a couple of eBay auctions and didn't see one.


Tnx,

Bob
--
W4ATM - 35 Miles south of the Kennedy Space Center
Retired RF Design Engineer
Now able to play with all the hobbies I never had enough time for


Re: Seen these Auto ATU's

montanaaardvark
 

On Mon, May 25, 2020 at 09:09 PM, Charles & Sandra Cohen wrote:
FWIW --

There's an extensive write-up of this N7DDC auto-tuner here:

http://radioaficion.com/news/automatic-antenna-tuner-kit/

But it doesn't give an impedance range.

Neat unit . . .  I'm not giving up my LDG Z-11 Pro.
Thanks Charles - at least I'm feeling more like it's not my Search Engine ability that got no results.  I looked in several places.  They'll tell you the component size range, but that's all I've found.

I know what you mean about your Z-11 Pro.  My IC-7000 sits on the AT-7000 that LDG made specifically for the radio. 
 

Bob
--
W4ATM - 35 Miles south of the Kennedy Space Center
Retired RF Design Engineer
Now able to play with all the hobbies I never had enough time for


Re: Seen these Auto ATU's

Charles & Sandra Cohen
 

FWIW --

There's an extensive write-up of this N7DDC auto-tuner here:

http://radioaficion.com/news/automatic-antenna-tuner-kit/

But it doesn't give an impedance range.

Neat unit . . .  I'm not giving up my LDG Z-11 Pro.

.   Charles / VA7CPC


Re: Seen these Auto ATU's

montanaaardvark
 

(I think I just hit a wrong button and got dumped - sorry if this is a dupe)

Do those "ATU-100 mini tuners by N7DDC" have a claimed impedance range?  You know, like the Icoms that have them have always claimed 3:1 VSWR.

I looked at a couple of eBay auctions and didn't see one.


Tnx,

Bob
--
W4ATM - 35 Miles south of the Kennedy Space Center
Retired RF Design Engineer
Now able to play with all the hobbies I never had enough time for


Re: Seen these Auto ATU's

Steve Sawicki
 

Interesting size and I like the power cell,can you provide the link as to the site.
Regards.
Steve
AB2ET


Re: Seen these Auto ATU's

 

By the way with an 8:1 SWr using RG8X at 7 mhz the losses would be 2.24dB or about 40%%.
100 watts in 53 watts at the antenna.
About 34% at 4 mhz, and 50% at 14 mhz, 60% at 28 mhz.
By the way I could measure this and the losses occur on receive as well.
Best not to give up that much when already handicapped in emergency and portable operations.
For that matter losses are losses at home as well.
A tuner at the antenna is more efficient in many ways due to mismatched currents in the shield as well with noise pickup etc.

On Mon, May 25, 2020 at 10:42 AM J.D. Barron via groups.io <jeter.d.barron=gmail.com@groups.io> wrote:
You are correct, but if you need the tuner anyway might as well put it where it will do the most good, especially if it is small and low power. In the camper I use for my emergency go box there is not a lot of excess space anyway,
I know that with the AS2259 the mast is actually a very low loss foam filled coaxial feedline that plugs together to get the height. This low loss mast plugs directly into the tuner in this case.


On Mon, May 25, 2020 at 10:24 AM Helmut Wabnig <hwabnig@...> wrote:


Have you ever measured "feed losses"?

This is like something from hell or evil devils.

In normal circumstances, that is, not extremely off VSWR,
the so called "feed losses" cannot even be measured with standard
cheap amateur radio equipment, so small they are.

If you have not tried it, you don't know.


OE8UWW





--
J.D. Barron



--
J.D. Barron


Re: Anything to look for

Paul Filardi
 

Fuse


On May 25, 2020, at 10:43, Paul Filardi via groups.io <Raritan36@...> wrote:

Also remember if use it at both ends


On May 25, 2020, at 09:24, Paul Filardi via groups.io <Raritan36@...> wrote:

When you hook up two batteries in parallel on a vehicle the weaker battery will always discharge the stronger battery to the point where it sucks both to zero the only way to do this properly is to separate them.   You can do that using a continuous duty solenoid so they are separated when the ignition is not on.  Wire the solenoid to any circuit that comes on with the ignition switch and your problem is solved you will not take out your good battery with a weaker battery


On May 25, 2020, at 05:53, Paul <pg321@...> wrote:



[Edited Message Follows]
[Reason: add]

80M mono right
2m/70cm left

Extra copper earth strap (unpainted atm) on left , there is one on the right also (painted) , they moved resonance the up by 10KHz .

73 , Paul .
ps- so far mobile 80m ssb to ZL2 4155klm / 2100 miles, VK4 450klm up north a f call using 10w and 1 local 20klm :-)
Sigs were ZL2 him S9 me S5 , VK4 him 10 over me 9 to 10 , local him 30+ me 25+ .

<80M.jpg>


Re: Seen these Auto ATU's

 

You are correct, but if you need the tuner anyway might as well put it where it will do the most good, especially if it is small and low power. In the camper I use for my emergency go box there is not a lot of excess space anyway,
I know that with the AS2259 the mast is actually a very low loss foam filled coaxial feedline that plugs together to get the height. This low loss mast plugs directly into the tuner in this case.


On Mon, May 25, 2020 at 10:24 AM Helmut Wabnig <hwabnig@...> wrote:


Have you ever measured "feed losses"?

This is like something from hell or evil devils.

In normal circumstances, that is, not extremely off VSWR,
the so called "feed losses" cannot even be measured with standard
cheap amateur radio equipment, so small they are.

If you have not tried it, you don't know.


OE8UWW





--
J.D. Barron


Re: Seen these Auto ATU's

Helmut Wabnig
 

Have you ever measured "feed losses"?

This is like something from hell or evil devils.

In normal circumstances, that is, not extremely off VSWR,
the so called "feed losses" cannot even be measured with standard
cheap amateur radio equipment, so small they are.

If you have not tried it, you don't know.


OE8UWW


Re: Anything to look for

Paul Filardi
 

Also remember if use it at both ends


On May 25, 2020, at 09:24, Paul Filardi via groups.io <Raritan36@...> wrote:

When you hook up two batteries in parallel on a vehicle the weaker battery will always discharge the stronger battery to the point where it sucks both to zero the only way to do this properly is to separate them.   You can do that using a continuous duty solenoid so they are separated when the ignition is not on.  Wire the solenoid to any circuit that comes on with the ignition switch and your problem is solved you will not take out your good battery with a weaker battery


On May 25, 2020, at 05:53, Paul <pg321@...> wrote:



[Edited Message Follows]
[Reason: add]

80M mono right
2m/70cm left

Extra copper earth strap (unpainted atm) on left , there is one on the right also (painted) , they moved resonance the up by 10KHz .

73 , Paul .
ps- so far mobile 80m ssb to ZL2 4155klm / 2100 miles, VK4 450klm up north a f call using 10w and 1 local 20klm :-)
Sigs were ZL2 him S9 me S5 , VK4 him 10 over me 9 to 10 , local him 30+ me 25+ .

<80M.jpg>


Re: Anything to look for

Paul Filardi
 

When you hook up two batteries in parallel on a vehicle the weaker battery will always discharge the stronger battery to the point where it sucks both to zero the only way to do this properly is to separate them.   You can do that using a continuous duty solenoid so they are separated when the ignition is not on.  Wire the solenoid to any circuit that comes on with the ignition switch and your problem is solved you will not take out your good battery with a weaker battery


On May 25, 2020, at 05:53, Paul <pg321@...> wrote:



[Edited Message Follows]
[Reason: add]

80M mono right
2m/70cm left

Extra copper earth strap (unpainted atm) on left , there is one on the right also (painted) , they moved resonance the up by 10KHz .

73 , Paul .
ps- so far mobile 80m ssb to ZL2 4155klm / 2100 miles, VK4 450klm up north a f call using 10w and 1 local 20klm :-)
Sigs were ZL2 him S9 me S5 , VK4 him 10 over me 9 to 10 , local him 30+ me 25+ .

<80M.jpg>


Re: Seen these Auto ATU's

 

Here is my thought about this ATU and it's size.
I have been using either an MFJ 939 or LDG - 100 when portable and installing it at the base of the 30' telescoping fidhing pole with a set of radials spread out on the ground.
I have also used a crossed dipole NVIS antenna to good effect (a copy of the AS2259). Either requires a tuner. What I am thinking about is building one of these with some NIMH batteries and mounting it as a balun at the feed point so that the feed losses would be minimal. It would be possible to incorporate a "TEE" power inserter to get 12 volts to the unit and eliminate the batteries as well. 
Darn it, just when I thought I had finished with my project list.


Re: Seen these Auto ATU's

 

NOW YOU HAVE DONE IT!!!
Posted something that I am interested in with no link or directions on how to find them.
NOW I am forced to GOOGLE!!!!!
Power? SWR range?? Just when I was getting  past project lust!


Re: SWR Spike on 6m

Adrian McGonigle
 

Been testing this at work over the weekend, the RF spikes are not just confined to 6m they are on HF as well, although the SWR spike is 6m only (will test again though but pretty sure it was only on 6m)  it momentarily throttles back the output power as it should, literally for a split second then every thing is good, if I dont drop out of TX in CW it stays fine but the moment theres a slight break in TX times the first key up shows the same SWR Spike momentarily. 

Adrian  G0KOM


Re: SWR Spike on 6m

 

I think the spike is an artifact of the circuit used to control the power output. The drive to the final is controlled by the circuit and has inputs from the CPU that sets the output (from low to high from the memory setting), the SWR, the forward power output, and SSB mode. The time constants that are in the circuit means that the drive is high and then cut back as the control takes effect. This is why I think that perhaps some of the circuit values might make some difference.
I have attached a PDF of the pertinent schematic page for reference.

On Sun, May 24, 2020 at 1:34 PM Paul <pg321@...> wrote:
10 cents worth

Maybe it might be close or similar on those selected icom's that are later model radio's , there was a few about and still is i seem to recall with spikes .

Maybe i also might have to look into it as i'm planning 6m mobile as well as the current 80 then 40/20m mobile . 73



--
J.D. Barron


Re: SWR Spike on 6m

david vanhorn
 

How clean is the output of the radio on 6M?  It may be out of band energy being reflected by the antenna. The SWR meter doesn't know frequencies.


On Sun, May 24, 2020 at 12:34 PM Paul <pg321@...> wrote:
10 cents worth

Maybe it might be close or similar on those selected icom's that are later model radio's , there was a few about and still is i seem to recall with spikes .

Maybe i also might have to look into it as i'm planning 6m mobile as well as the current 80 then 40/20m mobile . 73



--
K1FZY (WA4TPW) SK  9/29/37-4/13/15


Re: SWR Spike on 6m

Steve W3AHL
 

Icom hasn't acknowledged or fixed any problems since after the first year of the 7K's release in 2006.  They released a couple of changes, but as far as I'm concerned they didn't fix anything.

There are several problems in the ALC circuit that cause power spikes, typically noticed on CW with short rise times at faster keying rates.  I posted some data on that in the Files area of the group years ago.  I am not aware of SWR being affected by that though, but maybe your references to SWR were really meant to be just power spikes on the "SWR" meter??

There are also power spikes on SSB when compression is turned on.  It is caused by the PTT switch click in the HM-151 mic getting amplified greatly via the mic audio circuit. It varies by compression level setting and by how hard and fast you press the PTT switch.  Using a foot switch will cause the problem to disappear.   I also documented that in the files area.  But it wouldn't affect AM/FM, nor SWR.  

I'll take a look at my 7K's this week and see if they exhibit the problem you see, but don't expect any fix for it.....  If it was just a power spike on AM & FM (but no SWR  problem) I would look at the Transmitter Adjustments in the Service Manual, specifically TX Total Gain (50 MHz) and TX Output Power (50MHz).  If those are set wrong, the ALC spike can be more of a problem.  But I doubt it would affect SWR.  There are adjustments for the ALC circuit, but not specifically for 50 MHz band only.  

Steve, W3AHL

461 - 480 of 41254