Question abt transverter output

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  • Updated 3 years ago
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I’m considering purchasing a UHF transverter from the guy in the Ukraine. He has one that can cover 432-442, but it would require the radio to be capable of providing a 27-37 mhz signal. I have two questions about my 6500.

First, is the transverter out restricted to the amateur frequencies each region is authorized to use?

Second, can a 6500 provide a 27-37 mhz transverter output?
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WA2SQQ

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Posted 3 years ago

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Jon - KF2E

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No and yes. I use my flex to drive one of his 2 meter transverters (28-32mhz) with no problem. The Flex has enough output to drive it to 6-8watts.

Jon...kf2e
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Bill W2PKY

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The output of the TV port is limited to 32 mW
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WA2SQQ

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But can it provide a signal out of the assigned amateur bands? As low as 27 mhz? If it's going up to 32 mhz than I suspect it will go down to 27.
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Tim - W4TME, Customer Experience Manager

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Yes, it will.  The 6000s will transmit out the transverter port on most frequencies it will receive.  Check the specific 6000 model specs for the transverter TX ranges.
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WA2SQQ

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Thanks Tim. Very much appreciated.
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Jon - KF2E

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Yes

Jon...kf2e
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Doug Hall

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A number of us are using the Russian 2m transverter with the Flex with good success. I have not corresponded with any one using one of the 70cm models, but if it is anything like the 2m version the TX IMD is pretty nasty at the higher power levels. At lower power levels it is satisfactory. I run mine at 1 watt out into an RF Concepts 2-217 and get well over 100 watts out with good IMD performance.

And as others have confirmed the Flex can transmit outside the amateur bands when using the transverter port.

Please post a review of the 70cm transverter when you get it hooked up.

73,
Doug K4DSP
 
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WA2SQQ

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I concur about the 2 mtr version which I have. As long as you keep the power down, it's not bad. You get what u pay for. My final output is about 120 W on 2mtrs. He just introduced the 432 version as well as some other products. The Ukraine seems to be the new China!
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KF4HR

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If 70cm SSB/CW work is your goal, you may also want to consider the Kuhne TR432 H Transverter: http://shop.kuhne-electronic.de/kuhne/en/shop/amateur-radio/converter-transverte/transverter/TR+432+...
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WA2SQQ

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Not unless you can give me the winning numbers for tonight's lottery drawing! They are very nice, but way too expensive for the use it will probably get.
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Simon Lewis

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how about an Elecraft transverter .. decent and you get to build it too :)   Or a DownEast Microwave kit ... also pretty good ....
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WA2SQQ

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Yes they are, both are substantially more expensive. This is my 1st venture in 432, so I'm trying to keep the cost down. I can always upgrade and the lower cost unit can be easily resold.
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Doug Hall

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Simon,
At full tilt the Ukrainian transverter measures about -24 dB below peak. Yes, that's crappy in my book. But at 1 to 2 watts (where many of us run it) it improves to a little better than -30 dB below peak. That's better than a DEMI, about the same as the Elecraft, and a little less than 2 dB worse than the Kuhne. So we're not talking about a huge disparity in signal purity here. And these other transverters are 5X to 15X the cost of the Ukrainian one. So yeah, you get what you pay for, but on a logarithmic scale.

I'm a newcomer to the 2m weak signal world, and like you I care about the purity of my signal. But I see a lot of really ugly signals on 2m SSB and CW, and it seems many of these operators don't know or don't care. I think some of the offenders are using commercial amplifiers converted for amateur use and pushing them well past the point of linearity.
73,
Doug K4DSP
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Simon Lewis

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Hi Doug yes its horses for courses .... 33db down on a Kuhne is at 20W PEP though ... yes some horrible signals in europe too .. mostly from 12V amps overdriven or modded amps with poor bias control ...

in New Zealand its the opposite end .. low numbers of band ops and usually low end stations ..

prob comes when someone runs a Ukranian tvtr at full tilt into a poor amp .. ;)

The new DEMI ones are great but the problem lies in the Apollo LO .. its phase noise is like 75dbc ... which is really bad!

Hows the Ukranian one generate its LO .. fundamental crystal or some PC rock multiplied?
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Roy Laufer

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Well, the DEMI Transverter that I am expecting tomorrow uses my Flex 6700's GPSDO generated 10 MHz reference signal for it's LO (I wonder how that is spec-ed in comparison to the 75 dBc cited above?).

In my case this will be "tweaked" away from the weak signal SSB end and towards the FM Repeater end.

I'll let everyone know how it goes.

I considered the Ukranian folks, but even the new version does not cover the whole FM Repeater range, and I would need an enclosure, and an amplifier, and if it didn't work well, I'd have to argue with someone in the Ukraine, rather than Florida...

Your mileage may vary.
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Simon Lewis

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the phase noise is determined by the PLL in the LO ... I'd need to check if they improved any on that since I last looked .. they might have upgraded the design as they have been doing with their range recently

10 MHz phase noise WOULD impact that if you had say 150 dBc/Hz on the transverter and you fed a poor 10 MHz reference in but you won't have to worry the Flex GPSDO will be fine

On FM you would find it hard to notice anyway ...

It's close in transmit noise that would concern you most ... well for your neighbours :)

keep us posted ... always happy to talk VHF :)
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Simon Lewis

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Roy, if its an Apollo32 board then the spec's are still

(-72dBc/Hz @ 100Hz, -82dBc/Hz @ 1kHz,   -88dBc/Hz @ 10kHz)

According to their manual DEMI refer this as 'excellent' ...

Cough ... should be fine on FM :)

Cheers