Hello to all on the reflector; I have the opportunity to obtain the following amps. I have indicated what I know (if anything) about each amp and perhaps the price that it might be had for. What I wa
On Fri, 26 Mar 1999 22:16:36 -0700 "Michael J. Baker" <K0qz@primenet.com> writes: Ill buy it at that price! Runs OK on 30 and 17M as is, needs a few plate choke turns removed for 12M. If you keep it
Hi Carl, I have seen this term before, but really don't have any idea what you mean. Do u mean to tune it for peak then turn the load a bit more? I guess I don't know what "loading heavy" is. Thanks
On Sat, 27 Mar 1999 19:55:46 -0600 "Greg Gobleman" <k9zm@frontiernet.net> writes: Loading Heavy actually means to DECREASE the Load C value, it is confusing. On top of that the 0-100 panel labeling i
G'day Carl, I've been curious about a related subject for a while. I believe I more or less understand the mechanism by which heavy plate loading reduces IMD (i.e. by limiting negative peak anode vol
...other knowledgable persons on the reflector - Heavier loading as Carl describes will only very slightly reduce efficiency, however there will be a dramatic decrease in grid current. Too much grid
On Mon, 29 Mar 1999 10:15:04 +1000 "Graham Jones" <g.jones@bom.gov.au> writes: I believe you picked up on two items and left out the remainder Graham. The minimum bias and drive power are very import
? Let's say that a 25-ohm load were used. The swr would be 2 to 1, the anode V swing would decrease to about half. Does this scenario seem likely to produce a sharp rise in grid current?. Rich... R.
For whatever it's worth, my SB-220 will match an indicated SWR of well over 3:1 on 80 meters (running my 80-CW array on 75 phone) with normal grid current. In other words, as long as the plate loadin
Author: Dick Green" <dick.green@valley.net (Dick Green)
Date: Sun, 28 Mar 1999 21:47:58 -0500
snip... ... snip And the usual bit would be....? 73, Dick, WC1M -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.
? It seems somewhat unlikely that one can bring up the HV for the first time if the tube was tested by the manufacturer. - later, Dick Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measu
On Mon, 29 Mar 1999 02:20:58 +0100 Pete Smith <n4zr@contesting.com> writes: Agreed. I have modified the output loading values of just about every commercial amp I have owned to do just that on 80-160
I understand why folks do this, especially after having some arcing problems in my tuner on 80m during the WPX contest (had to do an emergency cap repair on my output cap in the tuner - a plate had
Hi Jon, (if anyone doesn't like my helping someone on an amplifier/antenna question, just use the delete key now!) You bring up some interesting questions we all face. I too would like to know what a
One thing I left out was that the new inverted vee cut for 3650 KHz would be coax fed. 73, Dan Magro W7RF, (President WARC 1999, member SCDXC, SCCC) Manufacturers Rep & Distributor for HENRY RF Power
I've not modelled it, but I think the load on the output side of a harmonic filter will have insignificant effect (a few dB in typ. 30+) on harmonic attenuation with most filter topologies. Steve --
30+) on Depends on the filter and the actual load impedance at the frequency in question. You can lose as much as 20dB of attenuation - although the likelihood of that much is probably on a par with
Questionable. Second, low pass filters are designed to have And so are antenna tuners. All bets are off otherwise. I run a 3KW ICE LP filter on the output and a relay switched set of bandpass filters
Hi - a lot of antenna tuners are in fact high pass networks, so instead of providing suppression of harmonics you do the opposite!! John ZS5JF -- To: <amps@contesting.com> -- FAQ on WWW: http://www.c
Right. The T-network is very popular because it easy to match a wide range of impedances with practical components, but it is a highpass filter. I have been successfully using an old Johnson 275-watt