KX3 booster

[John Harper]

I'm surprised a reputable company like DXE would sell the brand:

https://www.dxengineering.com/search/department/amplifiers/brand/rm-italy/product-line/rm-italy-la-250-series-vhf-linear-amplifiers?autoview=SKU&sortby=Default&sortorder=Ascending

John AE5X
https://ae5x.blogspot.com

_______________________________

On 11/5/2018 6:49 AM, Petr, OK1RP/M0SIS wrote:
>* I am looking for something cheap but reliable and found this small toy:
*>* http://www.rmitaly.us/index.php?main_page=product_info&products_id=128
<http://www.rmitaly.us/index.php?main_page=product_info&products_id=128>
*>>* The big disadvantage is that T/R switching is RF VOX by relays (no QSK
*>* available on CW)
*>* and second complain lack of output band-pass filters bank.
*
That's why it's cheap -- a lot of the parts are missing. It's quite
normal for power amps to generate strong harmonics -- 5dB down is common
for the second harmonic -- so they must be filtered by an output
network. Solid state amps without tuners have networks that match to 50
ohms. Tube amps use either Pi or Pi-L networks that are tunable.

73, Jim K9YC
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[Bob McGraw - K4TAX]

The model that DXE is selling is a VHF amp.  Note the disclaimer for the
HF model -  RM Italy KL 405v HF Linear Amplifier with Fan

"Export Only: This Model is not for sale in US, we only ship to the
address outside of US."

Needless to say, I would not run my call through one of these amps.   
There is enough "junk" being used for amps and radios on the air today. 
This only contributes to more noise and QRM on the bands.  Doesn't make
any difference in what part of the world they are being used.  It is
still spectrum RF Pollution.

We insist on better receivers.   Heck, we need cleaner transmitters and
amps, and not dirtier transmitters and amps.

73
Bob, K4TAX


On 11/5/2018 6:41 PM, John Harper wrote:

> I'm surprised a reputable company like DXE would sell the brand:
>
> https://www.dxengineering.com/search/department/amplifiers/brand/rm-italy/product-line/rm-italy-la-250-series-vhf-linear-amplifiers?autoview=SKU&sortby=Default&sortorder=Ascending
>
> John AE5X
> https://ae5x.blogspot.com
>
> _______________________________
>
> On 11/5/2018 6:49 AM, Petr, OK1RP/M0SIS wrote:
>> * I am looking for something cheap but reliable and found this small toy:
> *>* http://www.rmitaly.us/index.php?main_page=product_info&products_id=128
> <http://www.rmitaly.us/index.php?main_page=product_info&products_id=128>
> *>>* The big disadvantage is that T/R switching is RF VOX by relays (no QSK
> *>* available on CW)
> *>* and second complain lack of output band-pass filters bank.
> *
> That's why it's cheap -- a lot of the parts are missing. It's quite
> normal for power amps to generate strong harmonics -- 5dB down is common
> for the second harmonic -- so they must be filtered by an output
> network. Solid state amps without tuners have networks that match to 50
> ohms. Tube amps use either Pi or Pi-L networks that are tunable.
>
> 73, Jim K9YC
> ______________________________________________________________
> 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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