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#1
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Problem with Ten Tec 1340 qrp
Just got a TT 1340 40M qrp rig and cant seem to get it to tune, swr is way
up and there seems to be lots of oscillation going on in the rig. Power out is about 5 watts and the reflected power is just as high. Both long wire antennas tune fine with all my other rigs, except the 1340. Any comments? Thanks......Gil -- Remove NOSPAM to reply |
#2
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On Sat, 17 Jan 2004 12:48:09 GMT, "gil"
wrote: Just got a TT 1340 40M qrp rig and cant seem to get it to tune, swr is way up and there seems to be lots of oscillation going on in the rig. Power out is about 5 watts and the reflected power is just as high. Both long wire antennas tune fine with all my other rigs, except the 1340. Any comments? Thanks......Gil Have you tried calling Ten Tec? They were fairly helpful in getting my 1320 going. Also, you might look at this guy's pages: http://www.io.com/~n5fc/tt1340.html His 1340 was unstable into a long wire; stable when he switched to a balanced antenna. Maybe you just need a different antenna. (I'm running my 1320 into a multiband dipole, tuned through a tuner, and have no problem with swr.) Bob k5qwg |
#3
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On Sat, 17 Jan 2004 12:48:09 GMT, "gil"
wrote: Just got a TT 1340 40M qrp rig and cant seem to get it to tune, swr is way up and there seems to be lots of oscillation going on in the rig. Power out is about 5 watts and the reflected power is just as high. Both long wire antennas tune fine with all my other rigs, except the 1340. Any comments? Thanks......Gil Have you tried calling Ten Tec? They were fairly helpful in getting my 1320 going. Also, you might look at this guy's pages: http://www.io.com/~n5fc/tt1340.html His 1340 was unstable into a long wire; stable when he switched to a balanced antenna. Maybe you just need a different antenna. (I'm running my 1320 into a multiband dipole, tuned through a tuner, and have no problem with swr.) Bob k5qwg |
#4
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"gil" wrote in message link.net... Just got a TT 1340 40M qrp rig and cant seem to get it to tune, swr is way up and there seems to be lots of oscillation going on in the rig. Power out is about 5 watts and the reflected power is just as high. Both long wire antennas tune fine with all my other rigs, except the 1340. Any comments? Thanks......Gil -- Hi Gil, VSWR is a function of the load, not the TX . Have you tried a 50 Ohm dummy load? Next try an antenna that has a native 50 Ohm impedance- that is one that does not require a tuner. If it appears to have a hi VSWR, then indeed the rig's PA may be putting out spurs on freqs other than the desired frequency. At these spurious frequencies, the antenna will have a hi VSWR and thus your readings. Dale W4OP |
#5
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"gil" wrote in message link.net... Just got a TT 1340 40M qrp rig and cant seem to get it to tune, swr is way up and there seems to be lots of oscillation going on in the rig. Power out is about 5 watts and the reflected power is just as high. Both long wire antennas tune fine with all my other rigs, except the 1340. Any comments? Thanks......Gil -- Hi Gil, VSWR is a function of the load, not the TX . Have you tried a 50 Ohm dummy load? Next try an antenna that has a native 50 Ohm impedance- that is one that does not require a tuner. If it appears to have a hi VSWR, then indeed the rig's PA may be putting out spurs on freqs other than the desired frequency. At these spurious frequencies, the antenna will have a hi VSWR and thus your readings. Dale W4OP |
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