The tuner is a MFJ- 949e rated at 300 watts. I have not been able to
find the specs other than it is built to handle 300 W and will resonate
most antennas. It has tuned antennas for me for a long time without a
protest. Where do you find the specifications for the tuners? I keep
looking but only find the most general of specs, 300 watts etc.
My antenna is a G5RV with a 3/4 in twin lead feeder to normal coax. I
forgot who made it as I have had it up for a long time. It is full
size, not one of the ?double or half size antennas I see offered from
time to time. In the FWIW department the peak is about 40-45 ft with
the ends about 25-30 ft on one end and probably 40 ft on the other. It
goes out over a slope on that side. It works well for DX (that means I
can make contacts) but is very fussy close in (within 10 mi.) and seems
very directive. I have trouble working a few people who are close in,
although they may have minor things like rock between us. I am on Cape
Ann err Manchester, MA (Gloucesterites get a bit fussy about who claims
to reside on Cape Ann) and there is a reason that one community is
named Rockport. I have never seen a pattern for the G5RV on bands other
than 20 M and guess it is acting pretty much as an untuned dipole on
bands other than 20 M. Is this a bad assumption?
Thanks for the information.
73,
John / WA1JG
On 11/30/2011 3:33 AM, Rick - DJ0IP / NJ0IP wrote:
> John,
>
> The G5RV (if it is really built like the G5RV suggested antenna) has an
> impedance "close" to 50 Ohms on 80 and 40 and most other HF bands. The
> Jupiter's built-in tuner will have no problem matching it.
>
> If you have a "G5RV-like" antenna, such as it has the length of the G5RV,
> but runs openwire all the way to the shack, then the answer is "maybe".
>
> You asked to compare it to your MFJ tuner but that is like saying you have a
> car and asking if the gas mileage of a new Corvette will be as good as the
> one you have - hi. We can't answer until we know what car you have.
>
> If you dig into the specs of the MFJ tuners you will find that most specify
> that they can match up to about 1600 Ohms.
> Two or three say they can match up to 3200 Ohms.
> Some can match to 1200 Ohms, while there are one or two others that only
> match to about 800 Ohms. BTW, it's the high power tuners which have the
> lower matching ranges.
>
> I will make a HUGE assumption here and say that the Jupiter's tuner will
> probably match about the same as the MFJ that can match up to 1200 Ohms. It
> certainly is not going to match the range that the 3200 Ohms tuners can
> match. Maybe someone who owns one can check the manual and see if the specs
> on the matching range are printed.
>
> 73
> Rick, DJ0IP
>
>
> On 11/29/2011 12:26 PM, John wrote:
>> I am considering adding the autotuner to my Jupiter. My normal antenna
>> for now is a G5RV with plans for getting my R-7 Vertical back on the air
>> ASAP. Other than making me feel better, what is gained by adding the
>> autotuner to the mix. The G5RV gets quirky to tune on 80 and 40 using
>> my MFJ tuner. Will a G5RV be within the tuning range of the TT autotuner
>> with these bands and antenna? Any experiences are appreciated.
>>
>> 73,
>>
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