Thanks again, Wayne. I see a K4HD in my future...
73 Bill AA7XT *Bill Hein* *Sound Business Strategies, LLC* *m 970-628-5120* *b...@soundbusiness.us <b...@soundbusiness.us>* *The information contained in this transmission may contain privileged and confidential information, including patient information protected by federal and state privacy laws. It is intended only for the use of the person(s) named above. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution, or duplication of this communication is strictly prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message.* *Please help reduce paper and ink usage. Print only if necessary.* On Wed, Dec 2, 2020 at 10:47 AM Wayne Burdick <n...@elecraft.com> wrote: > > > On Dec 2, 2020, at 9:23 AM, William Hein <b...@soundbusiness.us> wrote: > > > > Back to the phase locked receivers in the K4D. Does the K4HD retain this > feature? I am wondering if the Superhet circuitry would mess up the phase > coherence? > > > The HDR (superhet) module is phase-locked at the IF. At the LO injection > it's frequency-locked to a small fraction of a Hz. This results in very > slow (mutliple-second) phase precessing when using diversity mode, which in > our experience has no impact, given that atmospheric phase changes occur > much more rapidly. > > > > ...is there a way to bypass the K4HD Superhet circuits when not (for > example) operating in a HF contest M2 or MM? > > Yes. There will be a top-level control for this purpose. > > 73, > Wayne > N6KR > > > > > > 73 > > Bill AA7xT > > > > > > Bill Hein > > Sound Business Strategies, LLC > > m 970-628-5120 > > b...@soundbusiness.us > > > > > > > > The information contained in this transmission may contain privileged > and confidential information, including patient information protected by > federal and state privacy laws. It is intended only for the use of the > person(s) named above. If you are not the intended recipient, you are > hereby notified that any review, dissemination, distribution, or > duplication of this communication is strictly prohibited. If you are not > the intended recipient, please contact the sender by reply email and > destroy all copies of the original message. > > > > Please help reduce paper and ink usage. Print only if necessary. > > > > > > On Sat, Nov 21, 2020 at 5:53 PM Wayne Burdick <n...@elecraft.com> wrote: > > Then yes, this should work. I had assumed it was producing a 1-Hz square > wave. > > > > Wayne > > > > ---- > > elecraft.com > > > >> On Nov 21, 2020, at 3:20 PM, William Hein <b...@soundbusiness.us> > wrote: > >> > >> > >> Hi, Wayne! > >> > >> I'm very happy about the phase sync between the two rxs, that will be a > lot of fun! > >> > >> FYI - The Bodnar GPS unit outputs a programmable output including 10 > MHz at various levels: > >> > >> Low-jitter GPS-locked precision frequency reference > >> 450 Hz to 800 MHz output > >> This device outputs two synchronised low-jitter reference clocks locked > to GPS signal. > >> Long term stability of output signal is defined by high accuracy of GPS > Caesium references and theoretically approaches 1x10-12. > >> Short term signal quality is defined by internal TCXO clock source > providing high-quality, low phase noise clock signal with sub-picosecond > RMS jitter. > >> Digital PLL allows main output reference frequency to have almost any > value between 450Hz and 800MHz. > >> The second output frequency depends on the first output due to a common > internal clock, if you need individual flexibility, multiple mini GPS units > may be a better choice. If both outputs have the same frequency their > relative phase shift can be adjusted. This can be used, for example, to > generate two signals with 90° phase shift for use in I/Q mixer. > >> Both output signals square wave at 3.3V CMOS levels with 50 Ohms > characteristic impedance. Their output drive levels can be adjusted and > outputs can be enabled and disabled independently. > >> Output power level (measured at 10MHz, fundamental power channel): > >> +13.3dBm, drive setting 32mA > >> +12.7dBm, drive setting 24mA > >> +11.4dBm, drive setting 16mA > >> > >> Bill Hein > >> Sound Business Strategies, LLC > >> m 970-628-5120 > >> b...@soundbusiness.us > >> > >> > >> > >> The information contained in this transmission may contain privileged > and confidential information, including patient information protected by > federal and state privacy laws. It is intended only for the use of the > person(s) named above. If you are not the intended recipient, you are > hereby notified that any review, dissemination, distribution, or > duplication of this communication is strictly prohibited. If you are not > the intended recipient, please contact the sender by reply email and > destroy all copies of the original message. > >> > >> Please help reduce paper and ink usage. Print only if necessary. > >> > >> > >> On Sat, Nov 21, 2020 at 2:46 PM Wayne Burdick <n...@elecraft.com> > wrote: > >> > >> > On Nov 21, 2020, at 1:38 PM, William Hein <b...@soundbusiness.us> > wrote: > >> > > >> > The K4D looks like an amazing radio! I am interested in diversity rx, > >> > primarily on 50 MHz. A few questions: > >> > > >> > (1) Are the two K4D receivers phase coherent (in sync)? > >> > >> Yes. > >> > >> > >> > > >> > (2) What is the resolution of the HDMI video output? > >> > >> Up to 4K. > >> > >> > >> > > >> > (3) Will the Ref In work with something like the Bodnar GPS reference > clock? > >> > >> REF IN requires a 10 MHz signal, not a GPS pulse. > >> > >> > >> 73, > >> Wayne > >> N6KR > >> > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
