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Re: JUMA COM HUB and MacBook, KX2, PA1000

Ryan, We have not tested JUMA COM HUB with a MacBook. But it should work fine if you are able to connect MacBook directly to your KX3. All the the settings are the same as if connecting directly to the KX3 alone. You only need to set COM HUB for the same baud rate as MacBook/KX3. Read more here http...
by OH7SV
17 Apr 2018 17:54
 
Forum: Juma Discussion
Topic: JUMA COM HUB and MacBook, KX2, PA1000
Replies: 1
Views: 203

Re: JUMA PA1000 with KAT-500

Hello all, Do not route JUMA PA1000 PTT signal via any tuner because it can cause hot switching in PA1000. The routing will spoil the PTT/RF timing coming from your transceiver. Typically the PTT signal (TX ON, SEND etc) comes abt 10ms before a transceiver is putting RF out and vice versa when you r...
by OH7SV
30 Jan 2018 16:52
 
Forum: Juma Discussion
Topic: JUMA PA1000 with KAT-500
Replies: 2
Views: 834

Re: Improving cooling of JUMA PA100-D

Roland,

Oh... that explains why you got so high temperature readings.
You can consider to install the original fan into the correct orientation.

73 Matti OH7SV
by OH7SV
05 Jan 2018 11:10
 
Forum: Juma Discussion
Topic: Improving cooling of JUMA PA100-D
Replies: 10
Views: 959

Re: Improving cooling of JUMA PA100-D

Ok Roland,

Please check that the fan is blowing towards the heatsink! (Not sucking)
How was the original fan installed?

73 Matti OH7SV
by OH7SV
05 Jan 2018 10:34
 
Forum: Juma Discussion
Topic: Improving cooling of JUMA PA100-D
Replies: 10
Views: 959

Re: PCB Gerber files for the retired Juma kits

Here are few decent PCB suppliers and you can easily find more by Googling.

www.pcbway.com
www.pcbgogo.com
www.pcbcart.com

73 Matti OH7SV
by OH7SV
04 Jan 2018 19:08
 
Forum: Juma Discussion
Topic: PCB Gerber files for the retired Juma kits
Replies: 2
Views: 552

PCB Gerber files for the retired Juma kits

Hello all, We have published the PCB Gerber files for the following retired Juma kits - RX1 Receiver - TX1 Transmitter - TRX1 Transceiver - TRX2-VM Voice Memory option - JUMA KB1 External Keyboard option Feel free to use these Gerber files for club projects or for your personal use. You can find the...
by OH7SV
04 Jan 2018 17:26
 
Forum: Juma Discussion
Topic: PCB Gerber files for the retired Juma kits
Replies: 2
Views: 552

Re: Improving cooling of JUMA PA100-D

Roland, You are right that digi modes load more and especially if the 'keydown' transmit period is long the temperature will increase. Good news is that we have not heard any PA transistor failures in JUMA PA100-D. There is one very easy improvement for additional cooling. See the section 3. in the ...
by OH7SV
01 Jan 2018 15:50
 
Forum: Juma Discussion
Topic: Improving cooling of JUMA PA100-D
Replies: 10
Views: 959

Re: TX 500 Filter orientation

Mike and others,

T1, T2, T3 and T4 are symmetrical RF transformers so you can install them in the two orientation.

The SWR bridge transformers T5 and T6 are not symmetrical but the PCB routing is designed so that you can install them also in the two orientation.

73 Matti OH7SV
by OH7SV
21 Dec 2017 19:47
 
Forum: Juma Discussion
Topic: TX 500 Filter orientation
Replies: 2
Views: 320

Re: PA1000 and Elecraft K3

Linas, I talked also to Juha OH2N who is an experienced K3 user. Juha suspected the power ON/OFF function thru the DB15 connector. According to Juha's foundings there has sometimes been problems with the related connections inside K3. Anyway I suggest that you make a GND wire between K3 to PA1000 gr...
by OH7SV
08 May 2017 19:46
 
Forum: Juma Discussion
Topic: PA1000 and Elecraft K3
Replies: 8
Views: 1530

Re: PA1000 and Elecraft K3

Linas, Pasi is using a similar cable from K3 DB15 connector to PA1000 DB9 connector. Here are some additional tips: 1. Check again very carefully the K3 side connector solderings. The pins of DB15 connector are so near each others. Use some magnifier glass to see any possible shorts to near by pins....
by OH7SV
08 May 2017 10:26
 
Forum: Juma Discussion
Topic: PA1000 and Elecraft K3
Replies: 8
Views: 1530
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