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 Ic7300 plus 2mtr transverter ? 
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Post Ic7300 plus 2mtr transverter ?
Anyone here running an Icom ic7300 with a 2mtr transverter ? Be interested to hear what make off transverter you are running and at what input power ? Tempted by one off the cheaper Ukrainian ebay transverters which from a bit off research are said to be fairly decent performers for the price they are. Problem is even with the attenuator board it's got a max off 10 watts input and bit worried about tx imd at lower levels on the 7300 which are said not to be the best.

Anyone here bought one off the above and advise ?

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Icom IC7300 / Kenwood TR751e
5/8 wave 10mtr vertical / 80-10mtr OCF dipole.
Behringer xm8500 mic ( IC7300 ) Datong ASP ( TR751e )
Ameritron als600x s/s linear

QRV on 10mtrs ssb.


Fri Jan 26, 2018 9:58 am
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
gm1zvj wrote:
Anyone here running an Icom ic7300 with a 2mtr transverter ? Be interested to hear what make off transverter you are running and at what input power ? Tempted by one off the cheaper Ukrainian ebay transverters which from a bit off research are said to be fairly decent performers for the price they are. Problem is even with the attenuator board it's got a max off 10 watts input and bit worried about tx imd at lower levels on the 7300 which are said not to be the best.

Anyone here bought one off the above and advise ?

There's a mod to the 7300 to get access to low power drive and separate RX.

Cheers

Tony

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Fri Jan 26, 2018 11:36 am
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
okay cheers tony appreciate the info. to be honest not too keen in having the ic7300 modded so will probably stick with the TR751e and forgett the transverter idea. just like the radio that much would love to use it features via a transverter on 2mtrs !

anyone else running a transverter with the ic7300 without the mod that tony pointed out ?

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Icom IC7300 / Kenwood TR751e
5/8 wave 10mtr vertical / 80-10mtr OCF dipole.
Behringer xm8500 mic ( IC7300 ) Datong ASP ( TR751e )
Ameritron als600x s/s linear

QRV on 10mtrs ssb.


Fri Jan 26, 2018 3:52 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
I know your not keen on modding, but maybe your not aware of the easy way you can do it, Kuhne offer a nice little board that is simple to install and could easily be removed if not wanted or when you decide to sell. Information here https://shop.kuhne-electronic.de/kuhne/ ... ?card=1820

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Fri Jan 26, 2018 4:19 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
ok cheers that's great appreciate the link will have a look at the kit in detail further tonight.you running the kit yourself ? any downsides ie . mentions strip where the external tuner would connect,take it there is still provision for the tuner and this does not replace it ?

showing my ignorance on the subject but I take it this way would provide a 100% cleaner signal regards the ic7300 poor tx imd at low output levels than running the transverter with just the max off 10watts input as per the makers specs?

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Icom IC7300 / Kenwood TR751e
5/8 wave 10mtr vertical / 80-10mtr OCF dipole.
Behringer xm8500 mic ( IC7300 ) Datong ASP ( TR751e )
Ameritron als600x s/s linear

QRV on 10mtrs ssb.


Fri Jan 26, 2018 5:03 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
Okay guys you've persuaded me will do it the proper way... !!

The Kuhne board ordered and on its way, plan was to get the elecraft xv144 transverter to go with it. Now been advised most xv144 transverters are off a good 1khz in freq, the one I have been offered is said to have the optional xtal oven fitted as well as a having a trimming inductor to oscillator circuit to allow xtal to be pulled on freq... as I plan to use the radio with my IC7300 I take it there should be no likely problems ? If the transverter is already set to be exactly on freq with the current owners set up will there be any requirement for it to be retuned for my radio ?

Lastly owner also advised me that he has replaced the front end with Demi Dem L144LNA 2mtr low noise amp, as I don't plan to use a mast head preamp is this still okay or better with the original ?

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Icom IC7300 / Kenwood TR751e
5/8 wave 10mtr vertical / 80-10mtr OCF dipole.
Behringer xm8500 mic ( IC7300 ) Datong ASP ( TR751e )
Ameritron als600x s/s linear

QRV on 10mtrs ssb.


Sun Jan 28, 2018 12:06 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
gm1zvj wrote:
Okay guys you've persuaded me will do it the proper way... !!

The Kuhne board ordered and on its way, plan was to get the elecraft xv144 transverter to go with it. Now been advised most xv144 transverters are off a good 1khz in freq, the one I have been offered is said to have the optional xtal oven fitted as well as a having a trimming inductor to oscillator circuit to allow xtal to be pulled on freq... as I plan to use the radio with my IC7300 I take it there should be no likely problems ? If the transverter is already set to be exactly on freq with the current owners set up will there be any requirement for it to be retuned for my radio ?

Lastly owner also advised me that he has replaced the front end with Demi Dem L144LNA 2mtr low noise amp, as I don't plan to use a mast head preamp is this still okay or better with the original ?

That was a useful post. I think I'll go for the kit as well, just saves a bit of messing.
If you fit the kit the ATU connector is tied back within the unit so not accessible from outside.

I'm using an XV144, with an oven but no trimming coil.
I could fit one, if wanted to, but why bother?
Calibration is 600hz off (they didn't bother with a trimmer as the Elecraft could be set with an offset) but why does that matter?
It's simple maths and the error has never caused me an issue, even with data modes.

If yours has the trimming inductor there's no issue.
Assuming both the previous owner's HF radio was on freq, and that yours is, no adjustment is required but, as I said before, does an error matter as long as you are aware of it?

My XV144 is, at present, in use without a preamp.
You can reduce the RF gain, if you have a lot of external gain.
There's little point in putting an external preamplifier in the shack.
It's purpose is to compensate for degradation due to the feeder so, to produce the desired effect it needs to be at the antenna.
At the moment mine is being used as standard, with the masthead amp deactivated.
I will install the sequencer when I get the chance and, rather than butcher the transverter, adjust the masthead amp gain to be only slightly more than feeder loss.

Cheers

Tony

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Sun Jan 28, 2018 2:58 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
okay thanks so much again tony appreciate the informative reply never bothered with transverters before so it's all a bit off the unknown for me !!
the reason the previous owner changed to the Demi Dem l144lna was because with a mast head preamp there was too much gain with the original front end , as I say don't plan to use a mast head preamp myself so just wondered if there was enough gain with just the new front end which obviously has less gain to compensate for the mast head preamp or better changing back ?

just want an efficient ssb station ( IC7300 wth the xv144 and around 160watts pep ) with any dx as it happens, no weak signal work , data modes etc etc

to be honest just didn't really want to have to run on 28.299 or 28.301 to be spot on 144.300.. take it this is what would be required without the aid off the trimming inductor ? would just like things to be right !!!

_________________
Icom IC7300 / Kenwood TR751e
5/8 wave 10mtr vertical / 80-10mtr OCF dipole.
Behringer xm8500 mic ( IC7300 ) Datong ASP ( TR751e )
Ameritron als600x s/s linear

QRV on 10mtrs ssb.


Sun Jan 28, 2018 3:35 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
gm1zvj wrote:
okay thanks so much again tony appreciate the informative reply never bothered with transverters before so it's all a bit off the unknown for me !!
the reason the previous owner changed to the Demi Dem l144lna was because with a mast head preamp there was too much gain with the original front end , as I say don't plan to use a mast head preamp myself so just wondered if there was enough gain with just the new front end which obviously has less gain to compensate for the mast head preamp or better changing back ?

just want an efficient ssb station ( IC7300 wth the xv144 and around 160watts pep ) with any dx as it happens, no weak signal work , data modes etc etc

to be honest just didn't really want to have to run on 28.299 or 28.301 to be spot on 144.300.. take it this is what would be required without the aid off the trimming inductor ? would just like things to be right !!!

Has the internal RF amp been removed, and bypassed, then?
If so the simplest option is to just replace the device.

With mine, attached to a 756, I tune to 28.300.600 for 144.3
Not an issue and I only really realise when decoding MS.

I have the transverter LO running all the time and, when I select the ON button on the transverter, it switches the 756 into transvert mode.

You will be better off with the XV144 than the Ukrainian unit, especially if you intend to run 160W.

Using the low power out of the 7300 you can use split TX/RX baseband from the XV144.
28MHz bandpass filtering can then be used to tidy the signals up even more.

Cheers

Tony

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Sun Jan 28, 2018 5:00 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
You can replace the crystal oscillator with a rock solid SI5351 synth board, small Arduino controller to drive it plus you then get the option to GPS lock the SI5351 too, for less than £20 you can get both accuracy and stability.


Sun Jan 28, 2018 5:43 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
2E1IIP wrote:
You can replace the crystal oscillator with a rock solid SI5351 synth board, small Arduino controller to drive it plus you then get the option to GPS lock the SI5351 too, for less than £20 you can get both accuracy and stability.

That's another possibility but poses the question - why would you?
The ovened oscillator, particularly when in the always on mode, is perfectly adequate.
I'd perhaps do it with a better quality unit, Kuhne for instance, if I was doing EME.
But they come with external ref anyway.
As it stands there are I'm sure, more productive ways to spend time.
Masthead preamp, for instance, assuming noise levels aren't too bad.

Cheers

Tony

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Sun Jan 28, 2018 6:14 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
Thanks again tony bit wiser now. and yep it's got to be on off the better transverters ie.elecraft etc on the buying list now. Will no doubt have more questions to come but thanks so much for the info.

_________________
Icom IC7300 / Kenwood TR751e
5/8 wave 10mtr vertical / 80-10mtr OCF dipole.
Behringer xm8500 mic ( IC7300 ) Datong ASP ( TR751e )
Ameritron als600x s/s linear

QRV on 10mtrs ssb.


Sun Jan 28, 2018 8:16 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
gm1zvj wrote:
Thanks again tony bit wiser now. and yep it's got to be on off the better transverters ie.elecraft etc on the buying list now. Will no doubt have more questions to come but thanks so much for the info.

I'm told, by someone who had one, that you should avoid the later Elecraft transverter.
A world of woe, it would appear.
The XV144 is reasonable, probably better than all but Kuhne, MET, or Sam's offerings.

Cheers

Tony

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Mon Jan 29, 2018 11:40 am
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
Okay perfect yep it's the elecraft xv144 that I will probably be buying. £180 sound about right price wise ?

What's your take on mast head preamps with regards general 144mhz ssb work ? occasional dx / poss contest work used with a decent 10ele yagi ( decent shortish length off coax ) and a decent take off it most directions.. overkill with a decent transverter or worth the extra expense ? if so any recommendations ?

_________________
Icom IC7300 / Kenwood TR751e
5/8 wave 10mtr vertical / 80-10mtr OCF dipole.
Behringer xm8500 mic ( IC7300 ) Datong ASP ( TR751e )
Ameritron als600x s/s linear

QRV on 10mtrs ssb.


Mon Jan 29, 2018 1:08 pm
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 Ic7300 plus 2mtr transverter ? 
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Post Re: Ic7300 plus 2mtr transverter ?
gm1zvj wrote:
Okay perfect yep it's the elecraft xv144 that I will probably be buying. £180 sound about right price wise ?

What's your take on mast head preamps with regards general 144mhz ssb work ? occasional dx / poss contest work used with a decent 10ele yagi ( decent shortish length off coax ) and a decent take off it most directions.. overkill with a decent transverter or worth the extra expense ? if so any recommendations ?

Looks like a good price.
£250 would be reasonable, but, if yours has had the RF device removed and by passed, a little less.

The need for a masthead preamp, on 2M, depends on several factors.
Local noise is the main one.
If you've a high noise level you probably will not notice the difference.
What do you consider to be a "decent shortish length of coax"?
What are you looking for?
General use, occasional DX - when it pops up, UKAC (Restricted or low power sections), meteor scatter, ES, and AUR - when it happens.
If it's the above the system, with up to 100W, you are talking about, without a masthead preamp, will be OK.

If it's a matter of extracting every last possible opportunity of a contact, EME, ES at the threshold, long distance tropo -under flat band, multiple hop ES - ES tropo ES, and the other difficult options that take a serious understanding, as well as hours of observation, then you need serious low noise head end preamp, as well as low loss cable, and state of the art transverter.
Of course, the 100W would then become an issue and 400W at the antenna probably a minimum.
The ones that do really well have very impressive systems with high ERP.

Cheers

Tony

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Mon Jan 29, 2018 1:45 pm
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