I had ubitx ,currently using for RX Only ,its my first HF set ,Ubitx having 3 Mhz to? 30 Mhz Frequency ,
1)Can i use this for Normal Radio RX i.e SW , i am able here radio but audio is not able to recognize.?
2)? what changes do need to do in this set to added any component to get full audio from SW frequency?



de?
vu3pen
sridhar?

OK, Sure you can listen to what you refer to as normal Shortwave because the radio's reciever covers the entire High Frequency spectrum. You will need an antenna system that allows you to tune the section of the spectrum your interested in listening to and adjust its tuning as you slide up or down the band. A 58 foot piece of wire that runs vertically for 17 feet before it bends at a right angle for the rest of its length coupled to a inexpensive MFJ 1600 long wire tuner works extremely well when the tuner and reciever are grounded to something like a cold water pipe.

The AM stations will sound a bit weird at first because if your not right on their carrier frequency the difference is heard as a high pitched tone that progressively becomes lower and goes to zero as you adjust the tuner on your reciever to match the AM broadcaster's carrier frequency. Since many broadcast AM with a side band to the left of the carrier and to the right of the carrier you will here the change in tone as you approach the carrier frequency from either end.?

Lastly, the reciever tunes well below the HF region into and below the AM commercial broadcast band. You can listen here too. Here I 'd recommend using a simple to make magnetic loop antenna because the frequency length of the associated stations in this area of the spectrum are so long that long wire antennas that will receive their signal are impractical to put in place.

Have fun, I do more listening then transmitting and what I described is what I am using with darn good success.

On Fri, Jun 22, 2018, 4:43 AM sridhar <vu3pen@...> wrote:

I had ubitx ,currently using for RX Only ,its my first HF set ,Ubitx having 3 Mhz to? 30 Mhz Frequency ,
1)Can i use this for Normal Radio RX i.e SW , i am able here radio but audio is not able to recognize.?
2)? what changes do need to do in this set to added any component to get full audio from SW frequency?



de?
vu3pen
sridhar?

The tuner I mentioned is actually a MFJ 16010 not 1600 as I initially indicated. It is very inexpensive and probably no more than $60. This type of tuner is easy to build if your so inclined. It only requires a variable capacitor and a hand wound inductor, coil, with taps spaced along its length. The taps and the variable capacitor adjust this LC circuit to match the signal of interest.?

On Fri, Jun 22, 2018, 5:40 AM R. Michael Boyer <rb5363@...> wrote:

OK, Sure you can listen to what you refer to as normal Shortwave because the radio's reciever covers the entire High Frequency spectrum. You will need an antenna system that allows you to tune the section of the spectrum your interested in listening to and adjust its tuning as you slide up or down the band. A 58 foot piece of wire that runs vertically for 17 feet before it bends at a right angle for the rest of its length coupled to a inexpensive MFJ 1600 long wire tuner works extremely well when the tuner and reciever are grounded to something like a cold water pipe.

The AM stations will sound a bit weird at first because if your not right on their carrier frequency the difference is heard as a high pitched tone that progressively becomes lower and goes to zero as you adjust the tuner on your reciever to match the AM broadcaster's carrier frequency. Since many broadcast AM with a side band to the left of the carrier and to the right of the carrier you will here the change in tone as you approach the carrier frequency from either end.?

Lastly, the reciever tunes well below the HF region into and below the AM commercial broadcast band. You can listen here too. Here I 'd recommend using a simple to make magnetic loop antenna because the frequency length of the associated stations in this area of the spectrum are so long that long wire antennas that will receive their signal are impractical to put in place.

Have fun, I do more listening then transmitting and what I described is what I am using with darn good success.

On Fri, Jun 22, 2018, 4:43 AM sridhar <vu3pen@...> wrote:

I had ubitx ,currently using for RX Only ,its my first HF set ,Ubitx having 3 Mhz to? 30 Mhz Frequency ,
1)Can i use this for Normal Radio RX i.e SW , i am able here radio but audio is not able to recognize.?
2)? what changes do need to do in this set to added any component to get full audio from SW frequency?



de?
vu3pen
sridhar?

One last thing. The length of wire I mentioned comes from someone that spent a lot of time analyzing this type of antenna and 58 feet is one of many lengths that avoid being equal to a half wave on any of the HF bands. Therefore in theory it will tune to any band you want to listen to. I chose 58 feet because of space limitations but there are other lengths that would work well too. Additionally my antenna rises 17 feet before making the right angle bend because of practical concerns and from listening as a measure of effectiveness it was a good choice perhaps because it receives well signals that are vertically polarized or horizontally polarized.

On Fri, Jun 22, 2018, 5:56 AM Mike aka KC2WVB <rb5363@...> wrote:

The tuner I mentioned is actually a MFJ 16010 not 1600 as I initially indicated. It is very inexpensive and probably no more than $60. This type of tuner is easy to build if your so inclined. It only requires a variable capacitor and a hand wound inductor, coil, with taps spaced along its length. The taps and the variable capacitor adjust this LC circuit to match the signal of interest.?

On Fri, Jun 22, 2018, 5:40 AM R. Michael Boyer <rb5363@...> wrote:

OK, Sure you can listen to what you refer to as normal Shortwave because the radio's reciever covers the entire High Frequency spectrum. You will need an antenna system that allows you to tune the section of the spectrum your interested in listening to and adjust its tuning as you slide up or down the band. A 58 foot piece of wire that runs vertically for 17 feet before it bends at a right angle for the rest of its length coupled to a inexpensive MFJ 1600 long wire tuner works extremely well when the tuner and reciever are grounded to something like a cold water pipe.

The AM stations will sound a bit weird at first because if your not right on their carrier frequency the difference is heard as a high pitched tone that progressively becomes lower and goes to zero as you adjust the tuner on your reciever to match the AM broadcaster's carrier frequency. Since many broadcast AM with a side band to the left of the carrier and to the right of the carrier you will here the change in tone as you approach the carrier frequency from either end.?

Lastly, the reciever tunes well below the HF region into and below the AM commercial broadcast band. You can listen here too. Here I 'd recommend using a simple to make magnetic loop antenna because the frequency length of the associated stations in this area of the spectrum are so long that long wire antennas that will receive their signal are impractical to put in place.

Have fun, I do more listening then transmitting and what I described is what I am using with darn good success.

On Fri, Jun 22, 2018, 4:43 AM sridhar <vu3pen@...> wrote:

I had ubitx ,currently using for RX Only ,its my first HF set ,Ubitx having 3 Mhz to? 30 Mhz Frequency ,
1)Can i use this for Normal Radio RX i.e SW , i am able here radio but audio is not able to recognize.?
2)? what changes do need to do in this set to added any component to get full audio from SW frequency?



de?
vu3pen
sridhar?

thx for valuable suggestions , i am also using the wire? antenna to? receive SW RX? ,? 40 feet on AIR , then 40 vertical means total 80 feet is using , the wire is normal AC wire used for the house internal wring , for the same wire if i put 12 band normal radio , the audio is coming .
(I will try with 58 feet also in air later )

But my question i in UBITX set how can i receive SW? frequency 3 to 30 Mhz Stations ? for got the antenna which i am feeding i had many options to feed the antenna?

de?
vu3pen
sridhar

I guess I don't understand because to receive 3 through 30 Mhz aside from an antenna you simply turn the knob on the VFO and with this radio if your in 'say' 7 Mhz and you want to listen to 3 Mhz then press the encoder to enter the menu. Follow the menu's change frequency prompts an you easily get to 3 Mhz otherwise it takes a lot of turning of the knob to lower from 7 to 3.

On Fri, Jun 22, 2018, 7:14 AM sridhar <vu3pen@...> wrote:

thx for valuable suggestions , i am also using the wire? antenna to? receive SW RX? ,? 40 feet on AIR , then 40 vertical means total 80 feet is using , the wire is normal AC wire used for the house internal wring , for the same wire if i put 12 band normal radio , the audio is coming .
(I will try with 58 feet also in air later )

But my question i in UBITX set how can i receive SW? frequency 3 to 30 Mhz Stations ? for got the antenna which i am feeding i had many options to feed the antenna?

de?
vu3pen
sridhar

I had ubitx ,currently using for RX Only ,its my first HF set ,Ubitx having 3 Mhz to? 30 Mhz Frequency ,
1)Can i use this for Normal Radio RX i.e SW , i am able here radio but audio is not able to recognize.?
2)? what changes do need to do in this set to added any component to get full audio from SW frequency?



de?
vu3pen
sridhar?

Mike

thx for tech inputs , yes i got the details from this post?
AM allows for 5KHz of audio and SSB allows for roughly 2.7 to 3 KHz of audio
to change this filters required?

thx?
de
vu3pen
sridhar?

Mike

thx for tech inputs , yes i got the details from this post?
AM allows for 5KHz of audio and SSB allows for roughly 2.7 to 3 KHz of audio
to change this filters required?

thx?
de
vu3pen
sridhar?

_._,_._,

While most AM is set up for a 6 KHz of audio, a side band filter of slightly over 2 KHz will usually allow voice through well enough to be understood.? The music will sound clipped or somewhat distorted as it often has higher audio frequencies than? most taking voices.

The filter in most of the ubitx is really too narrow to suit me as I only operate ssb with it.? I changed out the 5? 100pf capacitors in the crystal filter to 82 pf ( I think that is the standard value).? That broadened the filter in my ubitx from about 1700 hz to about 2300 hz.? Makes the audio sound much better for me.

One thing not discussed is that while AM often has the 6 khz filter, it only needs to be about half that when using a ssb filter as you are only using one sideband instead of both .? So around 3 khz would be good for AM.

de ku4pt

On Fri, Jun 22, 2018 at 3:50 PM, sridhar <vu3pen@...> wrote:

Mike

thx for tech inputs , yes i got the details from this post?
AM allows for 5KHz of audio and SSB allows for roughly 2.7 to 3 KHz of audio
to change this filters required?

thx?
de
vu3pen
sridhar?

_._,_._,

Ralph,?

Thanks, you did the calculations so a change is now simply swap out. I knew the filter was narrow but not that narrow. I guess they aimed at between ideal for CW and SSB by selecting as is.?

I don't have the stuff required for guaranteeing success when swapping out surface mounted capacitors. If I did I might make the change.?

I run my audio into the line in on a hi-fi system and can make the AM sound well enough to listen to by making audio adjustments, but I can see where it would be a pain in the arse to listen to the AM off a tiny 8 ohm speaker especially when it's frequency range is limited like it is.

On Jun 22, 2018 4:16 PM, "Ralph Mowery" <rmowery42@...> wrote:

While most AM is set up for a 6 KHz of audio, a side band filter of slightly over 2 KHz will usually allow voice through well enough to be understood.? The music will sound clipped or somewhat distorted as it often has higher audio frequencies than? most taking voices.

The filter in most of the ubitx is really too narrow to suit me as I only operate ssb with it.? I changed out the 5? 100pf capacitors in the crystal filter to 82 pf ( I think that is the standard value).? That broadened the filter in my ubitx from about 1700 hz to about 2300 hz.? Makes the audio sound much better for me.

One thing not discussed is that while AM often has the 6 khz filter, it only needs to be about half that when using a ssb filter as you are only using one sideband instead of both .? So around 3 khz would be good for AM.

de ku4pt

_._,_._,_

I did not really do much in the way of calculating.? I do have the equipment to check it our.? One way was to feed in a 1000 Hz audio tone into the mic input.? Then measure the output power.? Then go up and down in frequency to where the power makes a big drop off.??

I know that by lowering the value of the capacitors the filter gets wider and going up in value the filter gets narrower.? The first attempt was around 68 pf (or whatever the standard value is near that).? That made the filter way too wide,so I put in the 80 some and that put it close enough for me.

Even going into a hifi amp it will be difficult to make the music sound very good.? If the filter cuts out the highs and lows before it gets to the demodulation part, about all you can do is use an? equalizer and run the audio from less than 500 hz way up and the audio above 1800 way up as there is almost no audio outside 500 hz to 1800 hz.

As the ubitx is, it is a great piece of engineering, but it is also easy to make changes to for anyone that has a bit of equipment and know how.? Many have published their modifications so that people like me only need to do them.

de ku4pt

On Fri, Jun 22, 2018 at 5:41 PM, Mike aka KC2WVB <rb5363@...> wrote:

Ralph,?

Thanks, you did the calculations so a change is now simply swap out. I knew the filter was narrow but not that narrow. I guess they aimed at between ideal for CW and SSB by selecting as is.?

I don't have the stuff required for guaranteeing success when swapping out surface mounted capacitors. If I did I might make the change.?

I run my audio into the line in on a hi-fi system and can make the AM sound well enough to listen to by making audio adjustments, but I can see where it would be a pain in the arse to listen to the AM off a tiny 8 ohm speaker especially when it's frequency range is limited like it is.

On Jun 22, 2018 4:16 PM, "Ralph Mowery" <rmowery42@...> wrote:

While most AM is set up for a 6 KHz of audio, a side band filter of slightly over 2 KHz will usually allow voice through well enough to be understood.? The music will sound clipped or somewhat distorted as it often has higher audio frequencies than? most taking voices.

The filter in most of the ubitx is really too narrow to suit me as I only operate ssb with it.? I changed out the 5? 100pf capacitors in the crystal filter to 82 pf ( I think that is the standard value).? That broadened the filter in my ubitx from about 1700 hz to about 2300 hz.? Makes the audio sound much better for me.

One thing not discussed is that while AM often has the 6 khz filter, it only needs to be about half that when using a ssb filter as you are only using one sideband instead of both .? So around 3 khz would be good for AM.

de ku4pt

The frequency response of the second IF filters of the Ubitx vary from unit to unit depending also where the BFO is set. My unit for example is about 2khz wide filtering out frequencies below 700hz. This it is very good for speech either ssb or AM/CW. In general the less selective/worse the receiver is the better and the less fatiguing is the listening to AM broadcasts. For AM those large ugly portables with HF shine. The Ubitx sounds more a communication or military receiver, at least my unit. In general a 6khz wide filter allow just 3khz frequency response, which is not much more than the usual Ubitx. If the receiver has a passband offset control (PBT) you can possibly recover all the 6khz. In any case most large portable that have no PBT, the filter is so wide you have a more pleasant audio. To have that wide filters in the Ubitx maybe one could remove most of the crystals in the second IF.

Il 23/giu/2018 00:09, "Ralph Mowery" <rmowery42@...> ha scritto:

I did not really do much in the way of calculating.? I do have the equipment to check it our.? One way was to feed in a 1000 Hz audio tone into the mic input.? Then measure the output power.? Then go up and down in frequency to where the power makes a big drop off.??

I know that by lowering the value of the capacitors the filter gets wider and going up in value the filter gets narrower.? The first attempt was around 68 pf (or whatever the standard value is near that).? That made the filter way too wide,so I put in the 80 some and that put it close enough for me.

Even going into a hifi amp it will be difficult to make the music sound very good.? If the filter cuts out the highs and lows before it gets to the demodulation part, about all you can do is use an? equalizer and run the audio from less than 500 hz way up and the audio above 1800 way up as there is almost no audio outside 500 hz to 1800 hz.

As the ubitx is, it is a great piece of engineering, but it is also easy to make changes to for anyone that has a bit of equipment and know how.? Many have published their modifications so that people like me only need to do them.

de ku4pt

On Fri, Jun 22, 2018 at 5:41 PM, Mike aka KC2WVB <rb5363@...> wrote:

Ralph,?

Thanks, you did the calculations so a change is now simply swap out. I knew the filter was narrow but not that narrow. I guess they aimed at between ideal for CW and SSB by selecting as is.?

I don't have the stuff required for guaranteeing success when swapping out surface mounted capacitors. If I did I might make the change.?

I run my audio into the line in on a hi-fi system and can make the AM sound well enough to listen to by making audio adjustments, but I can see where it would be a pain in the arse to listen to the AM off a tiny 8 ohm speaker especially when it's frequency range is limited like it is.

On Jun 22, 2018 4:16 PM, "Ralph Mowery" <rmowery42@...> wrote:

While most AM is set up for a 6 KHz of audio, a side band filter of slightly over 2 KHz will usually allow voice through well enough to be understood.? The music will sound clipped or somewhat distorted as it often has higher audio frequencies than? most taking voices.

The filter in most of the ubitx is really too narrow to suit me as I only operate ssb with it.? I changed out the 5? 100pf capacitors in the crystal filter to 82 pf ( I think that is the standard value).? That broadened the filter in my ubitx from about 1700 hz to about 2300 hz.? Makes the audio sound much better for me.

One thing not discussed is that while AM often has the 6 khz filter, it only needs to be about half that when using a ssb filter as you are only using one sideband instead of both .? So around 3 khz would be good for AM.

de ku4pt