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[URL unfurl="true"]https://www.worldwidedx.com/threads/bias-design-amplifier-design-filtering-etc.37454/post-267018[/URL]

This thread brings up the subject of Biasing for the GrantXL and the Cobra 148 - especially around the Final Area...

Many have wondered about the use of TR37 in biasing the Final...
[ATTACH=full]64959[/ATTACH]

This article is a snippet of that PDF - shown below, to help clarify that process.

[ATTACH=full]64958[/ATTACH]

It provides a stable current to keep the 1969 forward biased - making it an effective method to keep SSB low-level volume signals from getting cutoff - and to allow peak SSB amplitude signals from getting clipped excessively as compared to when you use a SINGLE diode bias reference that can drop out due to the current draw thru the divider circuit causing a starvation contention.
- so you know many other SSB-radios use a divider circuit as a default.

<blockquote data-quote="Handy Andy" data-source="post: 821473" data-attributes="member: 52309">In reference to this message...[URL unfurl=&quot;true&quot;]https://www.worldwidedx.com/threads/bias-design-amplifier-design-filtering-etc.37454/post-267018[/URL]This thread brings up the subject of Biasing for the GrantXL and the Cobra 148 - especially around the Final Area...Many have wondered about the use of TR37 in biasing the Final...[ATTACH=full]64959[/ATTACH]This article is a snippet of that PDF - shown below, to help clarify that process.[ATTACH=full]64958[/ATTACH]It provides a stable current to keep the 1969 forward biased - making it an effective method to keep SSB low-level volume signals from getting cutoff - and to allow peak SSB amplitude signals from getting clipped excessively as compared to when you use a SINGLE diode bias reference that can drop out due to the current draw thru the divider circuit causing a starvation contention.<ul>
<li data-xf-list-type="ul">- so you know many other SSB-radios use a divider circuit as a default.</li>
</ul></blockquote>

[QUOTE="Handy Andy, post: 821473, member: 52309"] In reference to this message... [URL unfurl="true"]https://www.worldwidedx.com/threads/bias-design-amplifier-design-filtering-etc.37454/post-267018[/URL] This thread brings up the subject of Biasing for the GrantXL and the Cobra 148 - especially around the Final Area... Many have wondered about the use of TR37 in biasing the Final... [ATTACH type="full" alt="1691363939516.png"]64959[/ATTACH] This article is a snippet of that PDF - shown below, to help clarify that process. [ATTACH type="full" alt="1691363744128.png"]64958[/ATTACH] It provides a stable current to keep the 1969 forward biased - making it an effective method to keep SSB low-level volume signals from getting cutoff - and to allow peak SSB amplitude signals from getting clipped excessively as compared to when you use a SINGLE diode bias reference that can drop out due to the current draw thru the divider circuit causing a starvation contention. [LIST] [*]- so you know many other SSB-radios use a divider circuit as a default. [/LIST] [/QUOTE]

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