[hpsdr] Penny PTT unkeying spike - T/R sequencing?

[VAL PROBERT]

Howdy To All,

The Adelaide Hills Radio Club did offer some Codan amps for sale at a nominal 
price to club members a while ago.
I don't know if any are left but some members are using them with their HPSDR 
with success.
They are easy to link up and have band switching and other necessary stuff like 
PTT easily adapted.
Re the Codan specs please refer to the TSM for the 8528/9360 models which 
are typical of the Codan range.
You should find the information required in the PA section

http://codanukltd.co.uk/Service_Support_CD/data/tsm/8525-8528/%2815-02036%29%208525B-8528%20TSM.pdf


http://codanukltd.co.uk/Service_Support_CD/data/tsm/9323-9360-9390-9780/%2815-02051%29%20TSM.pdf


I tried a few methods of power reduction from Penelope to my amplifier.
My final solution was to use a 15db pad (at the output socket of Penelope) which 
gives good results.

Cheers to all
Dean  VK5LB.




________________________________
From: Phil Harman <phil at pharman.org>
To: Tom Cathey <k1jj at comcast.net>
Cc: hpsdr at lists.openhpsdr.org
Sent: Fri, 4 February, 2011 6:34:45 PM
Subject: Re: [hpsdr] Penny PTT unkeying spike - T/R sequencing?

***** High Performance Software Defined Radio Discussion List *****

Hi Tom,

Looks like you are making good progress.

Can you please confirm that the spike,

1. Only appears when using AM or FM
2. Appears at the output of Penelope and not just on the bandscope screen.

Re the "Codan Flying Doctor Radio?". I gave an HPSDR presentation last
year to the Adelaide Hills Amateur Radio Society. A number of their
members were using this PA. I suggest you contact them via their web page

http://www.ahars.com.au/

73 Phil..VK6APH

> ***** High Performance Software Defined Radio Discussion List *****
>
> Just to keep the thread updated and everyone informed, Gerd sent me a
> screen
> shot showing a Penny with the same spike that I am experiencing. He said
> he
> will look into it.  Good luck with that, Gerd!
>
> I find that with the PA db gain set above 38DB there is NO Penny lockup
> and
> no spurious images after key up. I set mine to 43db now as suggested by
> Phil.  This is a good thing and leaves only the spike issue left to solve.
>
> I am adding a small SS linear amplifier now.
>
>
> BTW, does anyone know where to find the IMD specs for the Codan linear
> amplifier  from a  "Codan Flying Doctor Radio?"  It is 0.5 watt in for 100
> watts out module and is an Australian make.
>
> Thanks.
>
> Tom, K1JJ
>
>
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help:
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
>


_______________________________________________
HPSDR Discussion List
To post msg: hpsdr at openhpsdr.org
Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
HPSDR web page: http://openhpsdr.org
Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/



      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20110205/7a75f1bc/attachment-0004.htm>