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Re: No suppression of sidebands TRX2

Don, Good to hear that you found the problem :) Those 'dry' solderings are qute very typical. I recommend to use more time during soldering. The components can stand lot of heat. Ps. You can fine tune the opposite side band attenuation with the I/Q trimmer R42 on DDS board http://www.jumaradio.com/j...
by OH7SV
08 Aug 2016 19:31
 
Forum: Juma Discussion
Topic: No suppression of sidebands TRX2
Replies: 1
Views: 1411

Re: Need TX500/136 or TRX2 Controller

Very good John,

Enjoy using your Juma.

73 Matti OH7SV
by OH7SV
11 Jul 2016 18:45
 
Forum: Juma Discussion
Topic: Need TX500/136 or TRX2 Controller
Replies: 4
Views: 1695

Re: Need TX500/136 or TRX2 Controller

John,

Do you mean TX500/136 or PA100-D control board because the hardware of those are identical?
(TRX2 control board is different)

73 Matti OH7SV
by OH7SV
27 Jun 2016 17:14
 
Forum: Juma Discussion
Topic: Need TX500/136 or TRX2 Controller
Replies: 4
Views: 1695

Re: JUMA PA1000 Linear Amplifier

Hello Petr,

JUMA PA1000 is using quite a fast and quiet mechanical T/R relay with max Operate/Release times of 4ms/6ms. That means you can implement quite a fast QSK but it is recommended to configure TRCVR "TXon" timing so that the relay is closed before transmit.

73 Matti OH7SV
by OH7SV
04 Feb 2016 17:51
 
Forum: Juma Discussion
Topic: JUMA PA1000 Linear Amplifier
Replies: 50
Views: 99901

More JUMA kits available now

Hello Juma friends,

There are now more kits available in Juma Shop, also the analog PA100 model.
Have a look www.jumaradio.com/shop

73 Matti OH7SV
by OH7SV
25 Dec 2015 22:10
 
Forum: Juma Discussion
Topic: More JUMA kits available now
Replies: 3
Views: 2330

Re: Juma TRX2A Info Needed Before Purchasing

Laurent, Thanks for your comments. Here are some preliminary good news. We have just completed the design and test of a new enhanced JUMA roofing filter FL2 option for TRX2. The standard roofing filter is using 3rd/5th order topology and the new enhanced filter option is using a carefully designed 9...
by OH7SV
20 Dec 2015 17:33
 
Forum: Juma Discussion
Topic: Juma TRX2A Info Needed Before Purchasing
Replies: 6
Views: 4284

Re: Juma TRX2A Info Needed Before Purchasing

Adrian, Thank you very much for your comprehensive answer. I have only two minor additions to your answer. 1. The Spurious Elimination Option (SE-option) is currently included in TRX2A kit package. 2. I am personally using only JUMA TRX2A and I have never lost a DX due to the TRX2A RX performance. S...
by OH7SV
16 Dec 2015 17:22
 
Forum: Juma Discussion
Topic: Juma TRX2A Info Needed Before Purchasing
Replies: 6
Views: 4284

JUMA kits available in Juma Shop

Hello Juma friends, Kari OH7FVG at RFdevice is currently delivering JUMA kits. Kari has already provided batches of TRX2A, PA100-D and TX500 kits. TX500 seems to be very wanted because the first batch was sold very quickly. No problem, Kari promised that more to come as well as other Juma kits. Curr...
by OH7SV
27 Nov 2015 18:39
 
Forum: Juma Discussion
Topic: JUMA kits available in Juma Shop
Replies: 0
Views: 1508

Re: Good news, TRX2A available

Terve Petr,

Kari OH7FVG is now working with TRX2A and PA100-D. Next he will prepare TX136 and TX500 kits and most probably later also series one Juma kits. Pse understand that Kari started from scratch one moth ago and it will take some time.

73 Matti OH7SV
by OH7SV
03 Nov 2015 19:46
 
Forum: Juma Discussion
Topic: Good news, TRX2A available
Replies: 2
Views: 1832

Good news, TRX2A available

Good news! We have recently agreed with a new JUMA partner Kari OH7FVG at RFdevice Ky. He just started to deliver the first TRX2A kits and will later on deliver also other popular JUMA kits. The first TRX2A batch is small but more to come soon. Yrjo OH3YP at OHKits will continue to handle JUMA PA100...
by OH7SV
31 Oct 2015 17:40
 
Forum: Juma Discussion
Topic: Good news, TRX2A available
Replies: 2
Views: 1832
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