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Re: JUMA PA100D 3rd order distortion

Dave & co,

See the PA100 IMD measurements in Juma pages
http://www.jumaradio.com/juma-pa100/jum ... ments.html

73 Matti OH7SV
by OH7SV
19 Aug 2012 05:33
 
Forum: Juma Discussion
Topic: JUMA PA100D 3rd order distortion
Replies: 1
Views: 2467

Re: PA100D "total disaster"

Björn, Sorry to hear that. But don't worry, every PA100 will function properly when everything is built in a correct way. If you feel that you can not find the problem by your self, pse contact Juma Community hams. They will help you. See this link http://www.jumaradio.com/juma/juma-community.html 7...
by OH7SV
24 Apr 2012 17:42
 
Forum: Juma Discussion
Topic: PA100D "total disaster"
Replies: 2
Views: 2966

Re: Possible mistake in TRX2 Main Board voltage table

Oh yes,
It seems there is a mistake during CW transmit state.
I will correct that.

73 Matti OH7SV
by OH7SV
25 Mar 2012 07:54
 
Forum: Juma Discussion
Topic: Possible mistake in TRX2 Main Board voltage table
Replies: 3
Views: 3198

JUMA PA1000 weight reduced from 14 kg to 5 kg

Here are the original heavy weight mains transformers. juma-pa1000-mains-transformers.jpg This is the prototype with the light weight resonance switching power supply. The power supply weights only 0.8kg. Note also the handle on the right side. juma-pa1000-SMPS.jpg The first tests have been done and...
by OH7SV
24 Mar 2012 17:39
 
Forum: Juma Discussion
Topic: JUMA PA1000 Linear Amplifier
Replies: 50
Views: 97202

Re: Possible mistake in TRX2 Main Board voltage table

Jan, You are right, IC2 pin 15 should be zero in CW during transmit state. This is not a mistake because all the voltages in the "Main Board DC voltage table" are in Receive state, Mode LSB. The IC2 pin 15 selects the TX muxer to CW during transmit. Main Board DC voltage table http://www.j...
by OH7SV
24 Mar 2012 15:50
 
Forum: Juma Discussion
Topic: Possible mistake in TRX2 Main Board voltage table
Replies: 3
Views: 3198

Re: TRX2 Main Board Voltage?

Jussi,

Olen valitettavasti kovin kiireinen ja sinun ongelman ratkaiseminen forumin avulla on hidasta.

Ehdotan, että otat yhteyttä Juma Community hamsseihin. He auttavat sinua.
Tarvittaessa voit antaa TRX2:n korjattavaksi.
Tässä linkki www.jumaradio.com/juma/juma-community.html

73 Matti OH7SV
by OH7SV
23 Mar 2012 17:51
 
Forum: Juma Discussion
Topic: TRX2 Main Board Voltage?
Replies: 2
Views: 2499

Re: Juma TRX2 - Magnetic loop.

Congratulations Kurt :D

Have you got any pictures of your bicycle wheel magnetic loop?
See my 3.5MHz loop here www.saunalahti.fi/hohtola/ham/magnetic- ... or-80m.htm

73 Matti OH7SV
by OH7SV
29 Feb 2012 13:46
 
Forum: Juma Discussion
Topic: Juma TRX2 - Magnetic loop.
Replies: 2
Views: 4188

Re: Juma TRX2A - Voltage supply problem in Main Board

Saku,

It seems you are circling around with the problem.
Please contact one of the Juma comminity hams to repair your TRX2A.
www.jumaradio.com/juma/juma-community.html

73 Matti OH7SV
by OH7SV
27 Feb 2012 06:31
 
Forum: Juma Discussion
Topic: Juma TRX2A - Voltage supply problem in Main Board
Replies: 17
Views: 14199

WRC-12 allocated 472-479 kHz to the amateur radio

Good news! On February 14, 2012, the delegates at World Radiocommunication Conference (WRC-12) formally approved allocating 472-479 kHz to the amateur radio service ; however, this new allocation will not take effect until it is entered into the ITU's Radio Regulations. Following that, individual re...
by OH7SV
15 Feb 2012 03:37
 
Forum: Juma Discussion
Topic: WRC-12 allocated 472-479 kHz to the amateur radio
Replies: 0
Views: 1703

Re: Does anyone know PIERRE EFKHANIAN ??

Heikki,

I think Pierre's call sign is F4DOE
I found this page http://hamcall.net/call/F4DOE
It needs registration to get more information.

73 Matti OH7SV
by OH7SV
05 Feb 2012 19:47
 
Forum: Juma Discussion
Topic: Does anyone know PIERRE EFKHANIAN ??
Replies: 1
Views: 2177
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