Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: RDR50 & RDR54 SDRs From Germany  (Read 11400 times)
K0OD
Member

Posts: 2578




Ignore
« on: March 29, 2013, 05:16:42 PM »

Reuter of Germany has been making computer-independent SDRs for several years. Latest model has transmitting capability. It's hard to learn about the products because almost all info is in German.

http://www.reuter-elektronik.de/

Video of the very attractive RDR54:
https://www.youtube.com/watch?v=ngQJfNaP-xA

Any info? Thoughts?
Logged
KA4POL
Member

Posts: 2097




Ignore
« Reply #1 on: March 29, 2013, 11:01:49 PM »

The Google translation works pretty well.
The rigs are interesting. Probably one would have to ask a lot of questions about their data before buying.
The TX output seems to be 4W PEP which is sufficient for an amplifier. The TX frequencies are limited to the ham bands but they offer individual adjustments. Some of us will not like rigs without knobs  Cheesy
The quality of SDR is pretty much depending on good software in addition to the hardware. With this rig you have no chance to use any other independent software like with many computer linked hardware.
Logged
K0OD
Member

Posts: 2578




Ignore
« Reply #2 on: March 30, 2013, 12:19:04 AM »

There's a Yahoo Group for the Reuter radios, but only a handful of members and posts.

Some sexy features: Frequency range starts at 1 kHz. Frequency display breaks new ground in reading to 0.1 Hz!!! Wonder whether it's really that accurate/stable.

Prices are given (in Euros) for the RDR50 but i can't find a price on the RDR54 model:
http://www.cqdx.ru/ham/new-equipment/german-rdr50a-hf-receiver/
Logged
KA4POL
Member

Posts: 2097




Ignore
« Reply #3 on: March 30, 2013, 12:32:19 AM »

The complete pricelist is at: http://www.reuter-elektronik.de/RDR_PL08.pdf
Logged
K5TED
Member

Posts: 781




Ignore
« Reply #4 on: April 02, 2013, 05:59:01 PM »

Looks great if you like what looks like a vintage Galaxy HF xcvr retrofitted with a iPad screen.

I like it.
Logged
K2GWK
Member

Posts: 530


WWW

Ignore
« Reply #5 on: April 30, 2013, 02:22:44 PM »

Expensive for a QRP rig also.
Logged

Guy
Lawn Guyland, New York

K2GWK Website
W6RMK
Member

Posts: 662




Ignore
« Reply #6 on: April 30, 2013, 07:30:23 PM »

Pricey, but I think one would buy these to fool with the technology, not as competition for an FT-817 or IC-7000.  You'd definitely be an early adopter.

These do direct conversion with pair of fast 16 bit ADCs.  The writeup references a polar amplifier, which is an interesting approach rather than doing a vector mod to a linear amp scheme.

I couldn't find a block diagram, which would be interesting to see.


Logged
ZENKI
Member

Posts: 980




Ignore
« Reply #7 on: May 08, 2013, 02:56:28 AM »

Yeah very expensive and another SDR radio with a junk transmitter with poor IMD performance.
Regardless of the ham transmitter manufacturer, its the same  old same old lousy TX performance.

Its is very easy too design and build a SDR transmitter that produces  very little splatter or IMD. Its also very easy too design a low power PA that is clean.
But this is typical what QRP companies do, they build the worlds worst PA in their QRP transmitters.

If they took leaf out of military radio producers and copied what they did they would get some respect for being innovative. Most of the low military transmitters  run class A and they are very clean.
Once you have a clean QRP driver it then becomes a good foundation for either building a super clean tube or FET PA.

The 1 st law of ham radio physics is that excellent receiver performance is wasted when you have substandard transmitter performances. Unfortunately all ham transmitters are sub standard.
The fools are the hams who continue on the road of enlightenment demanding better receiver performance and say nothing about the poor transmitter performance. Idiocy at its best I am sorry too say.

A lot of hams dont get the joke that is being played on them by all the receiver number propagandist. While  the objective  of the argument was a legitimate one   a decade ago, the argument holds no weight now
while  manufacturers are still selling radios with poor keying sidebands and IMD. Even worst is the terrible ALC designs that by their nature cause excessive splatter. Who is listening ? Unfortunately nobody because hams dont understand the issues all that well and just say nothing and continue to buy the crap.



Expensive for a QRP rig also.
Logged
WD5GWY
Member

Posts: 406




Ignore
« Reply #8 on: May 08, 2013, 03:02:25 AM »

Based on what tests that you have done or aware of, do you make this statement?
james
WD5GWY
Logged
DL4RAJ
Member

Posts: 2




Ignore
« Reply #9 on: May 11, 2014, 07:40:56 AM »

Yeah very expensive and another SDR radio with a junk transmitter with poor IMD performance.
Regardless of the ham transmitter manufacturer, its the same  old same old lousy TX performance.
....
Most of the low military transmitters  run class A and they are very clean.
Once you have a clean QRP driver it then becomes a good foundation for either building a super clean tube or FET PA.


Expensive for a QRP rig also.

I wonder if you actually know what you are talking about
and doubt if you have ever studied and understood the specs of the Reuter.
Even if you are not able to understand German you could read what the
screenshots are showing:
IMD3 products are 56,5dB below PEP @ 5W

Now give us an example of one single "low Military Transmitter running class A" and being
"very clean" and tell us its specs regarding IMD3.

DL4RAJ
Logged
KG8LB
Member

Posts: 243




Ignore
« Reply #10 on: June 26, 2014, 03:35:26 AM »

ZENKI , Where did you go ?  Huh
Logged
W3RSW
Member

Posts: 173




Ignore
« Reply #11 on: June 26, 2014, 06:55:55 AM »

Yes, Nice specs. Check screen shot of IMD
http://www.reuter-elektronik.de/Produkte/Digital-TX/digital-tx.html

Of course it's only 5 watts measured at 2.0 MHz. (50.5 db below two tone).  Lower IMD at "drive" levels is to be expected from 12 volt devices.
Also IMD at 30 MHz is probably somewhat higher.

Be fun to feed the one to five watts into a grid driven 4cx350, one of the cleanest bottles around for a great medium powered transmitter.

« Last Edit: June 26, 2014, 07:19:01 AM by W3RSW » Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!