Date   

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


Re: SWR Spike on 6m

 

In the IC-7000 power is regulated by the input to the circuit that looks at the desired power level, SWR, external ALC, if SSB mode has been selected, etc.
The output from this circuit goes to the CPU that controls the power level as a feedback. 
I think that you could check values around this comparator and see if you can see a problem, but many have noticed that there is a spike when the power is reduced to drive a linear amp. 
I had to work in this circuit when I had a problem in the SSB detect part that meant that I could not control the power at all.
I don't think that the spike is a problem if not driving a solid state amplifier.
That comparator gets inputs from fwd power, SWR, ALC and is damped when SSB is selected if I remember correctly.
If you want to pursue the problem this would be the circuit to examine first, but be warned the parts are very very small.


Re: SWR Spike on 6m

Adrian McGonigle
 

The RF Spike is evident on an external PEP meter as well, really surprised there hasnt been some sort of a fix documented for this, the radios work perfectly in every other way.

Adrian G0KOM


To: Paul

n4wfb.1@...
 

Paul, I sent you a private message (I think) regarding the OPC-1443 plug dimensions.  I can't figure out this forum software to determine if you received it or not?


Re: SWR Spike on 6m

Adrian McGonigle
 

Unfortunatley I dont have access to any test equipment, but I suspect there is an RF spike or some sort of overshoot as I tested the radio again tonight just for peace of mind and there is also a spike in RF power momentarily, the Power meter when the PTT is pressed in SSB goes full scale for a split second before settling down to nothing before any audio, this does not occur in any of my other Icom equipment. I seem to have found a lot of posts in various places about an RF spike or ALC overshoot etc etc but not once have I actually seen anyone who has solved the issue

Adrian G0KOM


www.ve2dx.com

VE2DX
 
Edited

OK, well after many months working at everything, a big piece of the puzzle is now online.

www.ve2dx.com

our new web site is live.

you will find information on our project, ham radios tips on ICOM, CI-V, Rotor controllers, etc...

please pass the word.
-- 
VE2DX ELECTRONIC 
WWW.VE2DX.COM
Only the Best ICOM, ERC and HRD 
https://groups.io/g/CIV
Follow my projects on www.facebook.com/VE2DX/
73
 
Richard VE2DX, Jesus Island, PQ-014


Re: RD15HVF1

Prabhu
 

Dear Pasqule ,
hope to see you here fine and safe,
you can get the driver board from icom or a group of people can design the board (some years before i had done) ,but that small heat sink gasket like setup should be retained ,if possible the size of heat sink can be increased if some body has milling facility ,with a perfect heat sink compound and an external 13.5V cutoff can help our driver board live longer ,As all knows the driver board becomes excite or force to feed the PA with more current when the input voltage drops..

73s


On Fri, 15 May 2020 at 20:16, Pasquale S via groups.io <iw0hex=yahoo.it@groups.io> wrote:

Hi guys

When driver board has gone faulty with PD55015 burned, in your opion, is it possible to put an RD15HVF1 ?

What do you thing about that ?

Thanks

Pasquale IW0HEX

 

 

Inviato da Posta per Windows 10

 


RD15HVF1

Pasquale S
 

Hi guys

When driver board has gone faulty with PD55015 burned, in your opion, is it possible to put an RD15HVF1 ?

What do you thing about that ?

Thanks

Pasquale IW0HEX

 

 

Inviato da Posta per Windows 10

 


Re: Latest free software

F5T F5T
 

>i do like the quick read/writes of ic700PROG but he only thing lacking is too be able to move up or down individual or several memories about , one has to do them and move them all over again

With IC7000PROG you can move up or down selected lines using ALT+up/down arrows (see menu->edit).
You can also do copy-and-paste

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