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Re: JUMA PA1000 Linear Amplifier

Petr and others,

See the update here http://www.jumaradio.com/juma-pa1000

73 Matti OH7SV
by OH7SV
17 Feb 2015 10:22
 
Forum: Juma Discussion
Topic: JUMA PA1000 Linear Amplifier
Replies: 50
Views: 99740

Recommended TRX2A modification

In some TRX2A units the GAIN BLOCK A9 on the Main Board can be overdriven which may cause splatter. To avoid possible splatter there is an easy modification by adding one resistor and one capacitor to the unused pads on the All Band PA Board. This modification increases the PA gain and thus gives mo...
by OH7SV
13 Dec 2014 09:06
 
Forum: Juma Discussion
Topic: Recommended TRX2A modification
Replies: 0
Views: 1747

Re: TX136/500 QRSS and DFCW modes added

Patrick,

Great work! DFCW has been requested many times for TX136 and TX500.
Thank you very much.

73 Matti OH7SV
by OH7SV
03 Sep 2014 09:23
 
Forum: Juma Discussion
Topic: TX136/500 QRSS and DFCW modes added
Replies: 7
Views: 5526

Re: Sticky Pen for SMD and tiny parts assembly and handling

Petr,

Sticky Pen looks clever tool for SMD. Where did you get those pens?

73 Matti OH7SV
by OH7SV
25 Aug 2014 08:57
 
Forum: Juma Discussion
Topic: Sticky Pen for SMD and tiny parts assembly and handling
Replies: 5
Views: 4250

Re: JUMA PA1000 - update?

Have a look on JUMA PA1000 update www.jumaradio.com/juma-pa1000/

73 Matti OH7SV
by OH7SV
24 Aug 2014 22:00
 
Forum: Juma Discussion
Topic: JUMA PA1000 - update?
Replies: 1
Views: 2000

Re: JUMA Kits Availability

Good news!

The first JUMA kits are now available from new supplier OHKits (Yrjo OH3YP).
See Juma Shop http://www.jumaradio.com/shop

73 Matti OH7SV
by OH7SV
11 Apr 2014 15:05
 
Forum: Juma Discussion
Topic: JUMA Kits Availability
Replies: 3
Views: 3861

JUMA Kits Availability

Good news to all,

The most popular Juma kits will be available soon. The new supplier Yrjo OH3YP has been working hard. The first kits will be available soon, keep watching Juma Shop.

73 Matti OH7SV
by OH7SV
27 Mar 2014 18:04
 
Forum: Juma Discussion
Topic: JUMA Kits Availability
Replies: 3
Views: 3861

Re: TX500 tx output, Missing signal Pin 76

Alex,

If the CW keyer is working and TX500 is in TX state the processor pin 76 should be going high/low as keying signal.
Is the CW keyer working?

73 Matti OH7SV
by OH7SV
25 Jan 2013 08:31
 
Forum: Juma Discussion
Topic: TX500 tx output, Missing signal Pin 76
Replies: 2
Views: 2900

Re: TRX1 PA Board

Marc,

The 2.5k high value is ok because there are 3 trimmers and other components in parallel.

Pse check your ohmmeter by shorting the meter wires. It should show zero to few ohms. If you have got a low ohmic resistor e.g. 100 ohms, test your ohmmeter with that too.

73 Matti OH7SV
by OH7SV
23 Nov 2012 07:16
 
Forum: Juma Discussion
Topic: TRX1 PA Board
Replies: 10
Views: 6997

Re: TRX1 PA Board Bias adjustment

Marc, There must be some very simple silly mistake in your measurement because this should be very easy to measure. The bias trimmer pots are 10 kohm trimmers and typically they will go clearly below 100 ohms at both end when turning fully to corresponding direction. Let's start from the beginning a...
by OH7SV
22 Nov 2012 18:51
 
Forum: Juma Discussion
Topic: TRX1 PA Board
Replies: 10
Views: 6997
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