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Just bought an IC7000 and am new to the group.? I'll be using it mainly for POTA work, using an 40-10 endfed antenna.? Do I need a tuner?? If so, and there isn't an AT-180 available, what should I look for?
Thanks,? Pete? K2UPD
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I use a AH4 mobile tuner it works well.
Just bought an IC7000 and am new to the group.? I'll be using it mainly for POTA work, using an 40-10 endfed antenna.? Do I need a tuner?? If so, and there isn't an AT-180 available, what should I look for?
Thanks,? Pete? K2UPD
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I have used such a set up out of the back of a land rover with an LDG AT7000 tuner; with the relevant connector from rig to ATU, and earthing both rig and tuner into a stake. Good earthing is vital, and/or a choke on the coax.
No problem at 90W, long wire about 80ft long (can't remember which we used) slung up into trees at 45 degrees, end point about 30 feet high.? I think LDG still offer various generic auto tuners with the Icom cable which powers the tuner from the rig - have
a search.?
Worked both inter G and European stations on 40, and further afield on 20. Was put up as a quick demo on a scout event.
Good luck and (a) enjoy the rig and (b) the group. 7000's are fabulous, great shame they ceased production.
Vy 73 Max/M0VNG
Subject: [ic7000] Tuner
Just bought an IC7000 and am new to the group.? I'll be using it mainly for POTA work, using an 40-10 endfed antenna.? Do I need a tuner?? If so, and there isn't an AT-180 available, what should I look for?
Thanks,? Pete? K2UPD
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I use an MFL 939 I and it has greater tuning range than the AT-180 and would be cheaper and works with other radios if you change later Rated 200 watts (I think).
I no longer have the IC-7000, but I still have the MFJ 939 I and never a minutes trouble for me.
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i use ldg it-100 works well
Just bought an IC7000 and am new to the group.? I'll be using it mainly for POTA work, using an 40-10 endfed antenna.? Do I need a tuner?? If so, and there isn't an AT-180 available, what should I look for?
Thanks,? Pete? K2UPD
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i use ldg it-100 works well
Just bought an IC7000 and am new to the group.? I'll be using it mainly for POTA work, using an 40-10 endfed antenna.? Do I need a tuner?? If so, and there isn't an AT-180 available, what should I look for?
Thanks,? Pete? K2UPD
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I would get a wide ranging tuner. Your antennas will change over time.
I use a MFJ 994-BRT.
Impedance matching range : 12 to 800 ohms
SWR matching range : Up to 4:1 for < 50 ohms and up to 16:1 for > 50 ohms
Jim WI6X
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i have the matching LDG-7000...works brilliantly,sits underneath the rig,inter-connecting cable and tunes up in seconds 160-6m. any of the other LDG's are popular..i once used the LDG-100pro? with it. also , take a look at the new chinese offering of the Mat-180h...lots youtube demos online. 73s
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I got a 7000 with one of the three IC-7000s I bought. It happened to not work and the problem was the CPU IC which is a programmable ASIC (or whatever) and is no longer available. Therefore LDG can no longer service these if the problem is that IC.
LDG was nice enough to send an IC for the later units, but the basic design has changed and I could not figure a way to modify it as the type of relays has also changed. Latching to non-latching (or the other way around).
Any of the newer tuners will work, but I have been well pleased with my MFJ 939I I. They cover a wide range and handle the power well. I used mine with the IC-7000 for years and with other radios like the IC-7100 etc as well.
JD Barron
KE4MD
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I'd go out on a limb and say that if the antenna is changing much, you have some antenna work to do.? Before winter would be GREAT! Dale
On Mon, Sep 26, 2022 at 7:43 PM James Dahl < wi6x.73@...> wrote: I would get a wide ranging tuner. Your antennas will change over time.
I use a MFJ 994-BRT.
Impedance matching range : 12 to 800 ohms
SWR matching range : Up to 4:1 for < 50 ohms and up to 16:1 for > 50 ohms
Jim WI6X
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²¹²Ô³Ù±ð²Ô²Ô²¹²õ¡±è±ô³Ü°ù²¹±ô
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I'd go out on a limb and say that if the antenna is changing much, you have some antenna work to do.? Before winter would be GREAT! Dale
On Mon, Sep 26, 2022 at 7:43 PM James Dahl < wi6x.73@...> wrote: I would get a wide ranging tuner. Your antennas will change over time.
I use a MFJ 994-BRT.
Impedance matching range : 12 to 800 ohms SWR matching range : Up to 4:1 for < 50 ohms and up to 16:1 for > 50 ohms
Jim WI6X
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You will need an external antenna tuner with the IC-7000.?
Running 100 watts into a 2:1 SWR (red bars on the internal SWR meter) can destroy the final transistors.??The IC-7000 will limit output power.?
Running 20 watts or less into greater than 2:1 SWR may be possible without damage,? but is not recommended.?
See pages 15 and 92 of the IC-7000 User Manual:
??
For end fed long wires, a 4:1 balun is recommended (but not essential) to lower the antenna impedance and make it easier for the antenna tuner to match.????
Avoid exact half-wavelength or multiples, because the impedance will be too high for the tuner to match.??
?
The inexpensive D7DDC design ATU-100 100 watt autuners advertized on Ebay and Amazon work great. The firmware imitates ther behavior of the Icom and LDG auto tuners.?
$73 fully assembled: ??
$30 kit with no enclosure: ??
?
These can be modified to connect to the 4 pin Icom TUNER port, so you can operate from your transceiver TUNER button:?
?Solder a 560 ohm resistor to via "A6" on tuner.? Connect to Icom TUNER pin 1 (_KEY).?
?Solder a 560 ohm resistor to "B" header on tuner.? Connect to Icom TUNER pin 2 (_START).?
?Connect "+" header pin on tuner to? Icom TUNER pin 3 (+12v).?
?Connect "-" header pin on tuner to? Icom TUNER pin 4 (GND).?
The current limiting resistors protect the tuner micro I/O pins from an accidental connection to +12 volts or ground.?
Recommend strapping 100pF capacitors to ground on these pins to keep out stray RF.?
?
Wnen an Icom transceiver senses 2 volts or more on _KEY when _START goes low,?
the Icom transceiver automatically limits power to 10 watts while tuning (when _KEY is then driven low by the tuner).?
On other transceivers, the operator must manually limit power to 10 watts while tuning, to protect the tuner's relay contacts.?
?
Description of the _START and _KEY signals on the Icom and LDG antenna tuners: ??
Description of the TUNER connector circuit on the IC-7000: ??
N7DDC ATU-100 Technical Description: ??
? 
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I don't need a tuner with my IC-7000 and 40-10 EFHW on the bands that the antenna is designed for. I get less thanl 1.5:1 SWR on all bands except 17M. If you don't need to operate 17M, AND you have the antenna properly trimmed, then you don't need a tuner.
Otherwise, I would suggest the LDG IT-100.
Cheers,
Jack W9JH
Arizona
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Yes, that changes things a lot.? The idea stays the same.? If you have one antenna or more than one for th3e plural to take effect, if your antenna is changing much, you still need some antenna work.? Preferably before the winter sets in. And yes, I am a firm believer in using the tuner. Hope that's a little clearer on my original post. Dale
On Tue, Sep 27, 2022 at 7:52 AM James Dahl < wi6x.73@...> wrote: ²¹²Ô³Ù±ð²Ô²Ô²¹²õ¡±è±ô³Ü°ù²¹±ô
I'd go out on a limb and say that if the antenna is changing much, you have some antenna work to do.? Before winter would be GREAT! Dale
On Mon, Sep 26, 2022 at 7:43 PM James Dahl < wi6x.73@...> wrote: I would get a wide ranging tuner. Your antennas will change over time.
I use a MFJ 994-BRT.
Impedance matching range : 12 to 800 ohms SWR matching range : Up to 4:1 for < 50 ohms and up to 16:1 for > 50 ohms
Jim WI6X
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Given the 7000's ability to blow it's driver fet right off the board or fry the finals, I would strongly encourage the use of a tuner at all times?
The LDG IT-100 is my choice, but there are many other fine ones.
Joe KR0UT?
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Many, many thanks to all that replied.? I found an IT-100 and will start with that.? The EFHW works fine on 40-20-15 CW low SWR <2:1 without a tuner.
73,? Pete? K2UPD
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On Tuesday, September 27, 2022 at 02:08:18 PM MDT, Jack W9JH <cqdx.ham@...> wrote: I don't need a tuner with my IC-7000 and 40-10 EFHW on the bands that the antenna is designed for.? Ditto.? My 7000 is my full time portable/RV radio and I nearly always use an EFHWA when camping.? I select the wire length to cover bands I want to use with the feed xfmr, I never use a tuner.? I learned years ago operating QRP/P that a tuner is just one more box to carry and futz with.? Much more convenient to select and deploy antennas that don't need a tuner. Mark K5LXP Albuquerque, NM
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All,?
I was looking through my local radio store's used equipment list and saw two antenna tuners, AT-7000 and IT-100, that would be great for the IC-7000.?
73, Seth Tartar KD0TEL
On Fri, Oct 7, 2022 at 11:44 AM Mark Brueggemann via <qrq_cw= [email protected]> wrote:
On Tuesday, September 27, 2022 at 02:08:18 PM MDT, Jack W9JH <cqdx.ham@...> wrote:
> I don't need a tuner with my IC-7000 and 40-10 EFHW on the bands that the antenna is designed for.?
Ditto.? My 7000 is my full time portable/RV radio and I nearly always use an EFHWA when camping.? I select the wire length to cover bands I want to use with the feed xfmr, I never use a tuner.? I learned years ago operating QRP/P that a tuner is just one more box to carry and futz with.? Much more convenient to select and deploy antennas that don't need a tuner.
Mark K5LXP
Albuquerque, NM
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I use three antennas with my IC-7000, which is my primary mobile rig.
1. EFHW4010 (49:1 transformer) - this antenna is resonant on 40/20/15/10 bands with SWR below 1.7:1 on all bands so I do not need ATU. Before operating I will check SWR on all bands using internal/external SWR meter just in case. I usually operate at 50-80W
2. EFLW (9:1 transformer) - I use ATU-100, before I operate on new band I turn power to 5W and using FM modulation I tune system, then I put power to 50-80W and operate
3. 17ft telescopic whip with loading coil - I don't use ATU, before I operate on new band I adjust coil for the loudest RX signal and then check SWR using internal meter at 5-10W power. Once I have good SWR I operate at 50-80W
My preferred antenna is EFHW4010 as it is easy and quick to set up and has superior performance to other two. I use Long Wire only if I need other bands than 40/20/15/10 and whip with a coil when space is limited and putting up EFHW is problematic. Hope this helps.
I setup EFHW and LW as inv-L with vertical section of 6-7mtr and rest as horizontal as possible.
GL 73 Marek
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On Friday, October 7, 2022, Mark Brueggemann via <qrq_cw= [email protected]> wrote: > > On Tuesday, September 27, 2022 at 02:08:18 PM MDT, Jack W9JH < cqdx.ham@...> wrote: > >> I don't need a tuner with my IC-7000 and 40-10 EFHW on the bands that the antenna is designed for.? > > Ditto.? My 7000 is my full time portable/RV radio and I nearly always use an EFHWA when camping.? I select the wire length to cover bands I want to use with the feed xfmr, I never use a tuner.? I learned years ago operating QRP/P that a tuner is just one more box to carry and futz with.? Much more convenient to select and deploy antennas that don't need a tuner. > > Mark K5LXP > Albuquerque, NM > > > > > > > > -- , 73de KF7SLM, J¨¬m
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6Y5WW - William
WI6X Jim
N0YWB