<div dir="ltr">John, W0GN said:<div>>>> New insulators were used with the transistors that were replaced. </div><div><br></div><div>What insulators are you referring to?</div><div>The PA transistors in PennyWhistle are real RF transistors, with the FET source brought out on the metal mounting tab.</div><div>They are supposed to be mounted metal on metal to the heatsink.</div><div>No insulators.</div><div><br></div><div>--- Graham / KE9H</div><div><br></div><div>==</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 13, 2019 at 7:09 PM AA8K73 GMail <<a href="mailto:aa8k73@gmail.com">aa8k73@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">***** High Performance Software Defined Radio Discussion List *****<br>
<br>
Thank you for your response John, I appreciate it.<br>
<br>
<br>
I've been working with another nice guy off-list, with <br>
suggestions and measurements. Late last night I discovered a <br>
wiring error on T2. This morning I put a new winding on and my <br>
PennyWhistle works fine. The output is 15.7 watts.<br>
<br>
<br>
I just found my second Penelope and tested the output. Same <br>
value. About 0.2 watts.<br>
<br>
The Penelope manual, the OpenHPSDR Penelope web page, and TAPR <br>
web page all say that Penelope is 0.5 watt. I was wondering if <br>
I had done something wrong.<br>
<br>
Although I worked VP2MAC on CW with Penelope using a vertical <br>
antenna. :)<br>
<br>
I didn't use insulators on Q1 and Q2, I just bolted them <br>
directly to the PennyWhistle heatsink.<br>
<br>
Based on your experience John, I think that I run PennyWhistle <br>
at a max of 10 watts.<br>
<br>
Thanks again John.<br>
<br>
<br>
Now, on to winding my Munin transformers...<br>
<br>
<br>
Mike - AA8K<br>
<br>
<br>
On 4/13/19 17:39, <a href="mailto:radio@netins.net" target="_blank">radio@netins.net</a> wrote:<br>
> Lurking and listening to the April 12 Team Speak I heard you had <br>
> still not heard about your inquiry.<br>
> I built a Penny Whistle to use with my Hermes and I don't have <br>
> experience with other exciters.<br>
> Please see my comments below.<br>
> <br>
> On 2019-04-10 8:19 pm, AA8K73 GMail wrote:<br>
>> ***** High Performance Software Defined Radio Discussion List <br>
>> *****<br>
>><br>
>> The lust for high power has called me and I'm connecting my<br>
>> PennyWhistle to my Penelope for the first time. I not seeing <br>
>> gain out<br>
>> from PennyWhistle.<br>
>><br>
>><br>
>> The Penelope is an original TAPR. I made the T2 modification to<br>
>> rotate the output transformer.<br>
> <br>
> <<<< When I put the Penelope output into a<br>
>> dummy load, and PowerSDR Tune set to 100, I see 9.5 volts <br>
>> peak-to-peak<br>
>> across the 53 ohms.>>><br>
> <br>
> The exciter output of 9.5 v p-p (about 3.4 V RMS) is roughly 1/5 <br>
> Watt.<br>
> I have never measured the output of my Hermes, but as I recall <br>
> it is rated at about 200 mW.<br>
> This should be enough to get power out of Penny Whistle.<br>
> <br>
> I was never able to get the published power output from my Penny <br>
> Whistle, but this may have been due to my lack of attention at <br>
> carefully winding the binocular output transformer.<br>
> <br>
> I set the bias on my Penny Whistle for SSB use, but used it for <br>
> CW and digital modes. The output of Penny Whistle is run <br>
> through ALEX and to the load (antenna or dummy load) On 6m I <br>
> can only get 5W output as indicated in HPPower SDR. The most <br>
> output was about 17 W on 30m.<br>
> <br>
> My Penny Whistle failed and I replaced both output transistors <br>
> to restore operation. Before replacing the output transistors I <br>
> used a piece of plate class and fine emery cloth to flatten the <br>
> heatsink surface. New insulators were used with the transistors <br>
> that were replaced. When operation was restored I did not <br>
> notice any improvement over the original power. It worked for <br>
> many, many hours until we changed homes. Since then, I have not <br>
> put up any antennas other than a temporary 2m antenna.<br>
> <br>
> To obtain the output powers on my Penny Whistle I never have had <br>
> to use the full amount of drive indicated in HPPowerSDR.<br>
> Based upon what you have posted and my experience with Penny <br>
> Whistle, I think something is definitely wrong with Penny <br>
> Whistle or the way it is being used.<br>
> <br>
> I would check and then check again the coax cables and T/R <br>
> wiring. Also, you should have some sort of filtering on the <br>
> output of Penny Whistle.<br>
> <br>
> Finally, look into the settings in HPPowerSDR. You may have to <br>
> change a setting there. I made screen captures of my settings <br>
> to reduce chances for setup errors when updates were installed. <br>
> If you would like to see my settings, let me know.<br>
> <br>
> John, W0GN<br>
> <br>
> <br>
> <br>
>><br>
>><br>
>> 1. Is this normal output for the Penelope?<br>
>><br>
>><br>
>> When I put PennyWhistle on Penelope, the voltage to the dummy <br>
>> load is<br>
>> 3 volts peak-to-peak. I even manually grounded the <br>
>> PennyWhistle bias<br>
>> control in case there was a problem with Penelope's PTT-out.<br>
>> PennyWhistle's 13.6 volt power increases about 1 ampere when <br>
>> the bias<br>
>> control is grounded.<br>
>><br>
>><br>
>> Any hints for troubleshooting?<br>
>><br>
>><br>
>> Mike - AA8K<br>
>><br>
>> Metis 3.0<br>
>> Mercury 3.4<br>
>> Mercury/2 3.4<br>
>> Penny(Lane) 1.8<br>
>> PowerSDR OpehHPSDR mRX PS v3.3.8 (6/9/16)<br>
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