Questions regarding my new KX3.
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HI All Elecraft users! I have some questions regarding my new KX3 (I love it!). 1) how could I use my KX3 on 472 kHz (new band freshly opened in France) in transmit mode even at low power like on a TS-590? 2) regarding the 2 meter option for KX3 (which will be available in September, as far as I know), I would like to use it with DB6NT Microwave transverters which could be controlled in TX mode thanks to a + TX voltage of 5 to 12 V on the inner conductor of SMA antenna with a very low current (to the base of a low-power switchîng transistor). My FT-817 was modified this way on BNC output injecting +5V TX through a 4.7kR and a 1nF in order to prevent DC to enter receiver. 3) same question regarding BNC output as 28 or 50 MHz could be also used as IF for 70 / 23 cm transverters . Sorry if these questions have been already aśked on this reflector as I am newly on it. Thanks in anticipation for your responses. Jacques F6AJW/ Paris Envoyé de mon iPhone ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Questions regarding my new KX3.
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"Jack.f6ajw" <[hidden email]> wrote:
> I have some questions regarding my new KX3 (I love it!). > > 1) how could I use my KX3 on 472 kHz (new band freshly opened in France) in transmit mode even at low power like on a TS-590? The KX3 doesn't have sufficient filtering for transmit at 472 kHz, nor much gain at this frequency in the PA. I would suggest using an external transverter for this band. For receive-only use, you could add a 500-kHz low-pass filter to eliminate any images due to local oscillator harmonics. > 2) regarding the 2 meter option for KX3 (which will be available in September, as far as I know), I would like to use it with DB6NT Microwave transverters which could be controlled in TX mode thanks to a + TX voltage of 5 to 12 V on the inner conductor of SMA antenna with a very low current (to the base of a low-power switchîng transistor). My FT-817 was modified this way on BNC output injecting +5V TX through a 4.7kR and a 1nF in order to prevent DC to enter receiver. Yes, the KX3-2M (and -4M) module will include a switchable DC voltage at the antenna. > 3) same question regarding BNC output as 28 or 50 MHz could be also used as IF for 70 / 23 cm transverters . Sorry, there's no provision for DC at the BNC output of the KX3. 73, Wayne N6KR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Questions regarding my new KX3.
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Thank you for your responses, Wayne ; comments on your text.
Envoyé de mon iPhone > Le 16 juin 2014 à 20:37, Wayne Burdick <[hidden email]> a écrit : > > "Jack.f6ajw" <[hidden email]> wrote: > >> I have some questions regarding my new KX3 (I love it!). >> >> 1) how could I use my KX3 on 472 kHz (new band freshly opened in France) in transmit mode even at low power like on a TS-590? > > The KX3 doesn't have sufficient filtering for transmit at 472 kHz, nor much gain at this frequency in the PA. I would suggest using an external transverter for this band. For receive-only use, you could add a 500-kHz low-pass filter to eliminate any images due to local oscillator harmonics. RR, so usable only in receiving mode and with external filter but no luck for TX without external transverter. > > >> 2) regarding the 2 meter option for KX3 (which will be available in September, as far as I know), I would like to use it with DB6NT Microwave transverters which could be controlled in TX mode thanks to a + TX voltage of 5 to 12 V on the inner conductor of SMA antenna with a very low current (to the base of a low-power switchîng transistor). My FT-817 was modified this way on BNC output injecting +5V TX through a 4.7kR and a 1nF in order to prevent DC to enter receiver. > > Yes, the KX3-2M (and -4M) module will include a switchable DC voltage at the antenna. Very good! 4m version will be interesting for Hams in euro pin some cou tries which have 4m allocation. Except IC-7000 and may be FT-847, no dedicated 4m transceiver is available so congrats > > >> 3) same question regarding BNC output as 28 or 50 MHz could be also used as IF for 70 / 23 cm transverters . > > Sorry, there's no provision for DC at the BNC output of the KX3. > > 73, > Wayne > N6KR > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Questions regarding my new KX3.
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Sorry for too early sending of my previous message.
I continue.... Envoyé de mon iPhone > Le 16 juin 2014 à 23:08, "Jack.f6ajw" <[hidden email]> a écrit : > > Thank you for your responses, Wayne ; comments on your text. > > Envoyé de mon iPhone > >> Le 16 juin 2014 à 20:37, Wayne Burdick <[hidden email]> a écrit : >> >> "Jack.f6ajw" <[hidden email]> wrote: >> >>> I have some questions regarding my new KX3 (I love it!). >>> >>> 1) how could I use my KX3 on 472 kHz (new band freshly opened in France) in transmit mode even at low power like on a TS-590? >> >> The KX3 doesn't have sufficient filtering for transmit at 472 kHz, nor much gain at this frequency in the PA. I would suggest using an external transverter for this band. For receive-only use, you could add a 500-kHz low-pass filter to eliminate any images due to local oscillator harmonics. > > RR, so usable only in receiving mode and with external filter but no luck for TX without external transverter. >> >> >>> 2) regarding the 2 meter option for KX3 (which will be available in September, as far as I know), I would like to use it with DB6NT Microwave transverters which could be controlled in TX mode thanks to a + TX voltage of 5 to 12 V on the inner conductor of SMA antenna with a very low current (to the base of a low-power switchîng transistor). My FT-817 was modified this way on BNC output injecting +5V TX through a 4.7kR and a 1nF in order to prevent DC to enter receiver. >> >> Yes, the KX3-2M (and -4M) module will include a switchable DC voltage at the antenna. > > Very good! 4m version will be interesting for Hams in some coutries in Europe which have 4m allocation. Except IC-7000 and may be FT-847, no dedicated 4m transceiver is available so congrats for that! >> >> >>> 3) same question regarding BNC output as 28 or 50 MHz could be also used as IF for 70 / 23 cm transverters . >> >> Sorry, there's no provision for DC at the BNC output of the KX3. May be available in the future? 73's Jacques F6AJW/Paris >> >> 73, >> Wayne >> N6KR >> >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Questions regarding my new KX3.
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In reply to this post by Jack F6AJW
>> The KX3 doesn't have sufficient filtering for transmit at 472 kHz, nor much gain at this frequency in the PA. I would suggest using an external transverter for this band. For receive-only use, you could add a 500-kHz low-pass filter to eliminate any images due to local oscillator harmonics.
> > RR, so usable only in receiving mode and with external filter but no luck for TX without external transverter. Correct. 73, Wayne N6KR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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